diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9fbe6982..940717df 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -73,6 +73,7 @@ add_subdirectory(${CMAKE_CURRENT_LIST_DIR}/${TX_COMMON_DIR})
 # Define the FreeRTOS adaptation layer
 add_library(freertos-threadx EXCLUDE_FROM_ALL)
 target_include_directories(freertos-threadx
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/utility/rtos_compatibility_layers/FreeRTOS
 )
@@ -109,6 +110,7 @@ else()
 endif()
 configure_file(${TX_USER_FILE} ${CUSTOM_INC_DIR}/tx_user.h COPYONLY)
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CUSTOM_INC_DIR}
 )
diff --git a/ports/arm11/gnu/CMakeLists.txt b/ports/arm11/gnu/CMakeLists.txt
index 208d5175..83d7e0fa 100644
--- a/ports/arm11/gnu/CMakeLists.txt
+++ b/ports/arm11/gnu/CMakeLists.txt
@@ -27,6 +27,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/arm9/gnu/CMakeLists.txt b/ports/arm9/gnu/CMakeLists.txt
index 669cedc2..6d071937 100644
--- a/ports/arm9/gnu/CMakeLists.txt
+++ b/ports/arm9/gnu/CMakeLists.txt
@@ -27,6 +27,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a12/gnu/CMakeLists.txt b/ports/cortex_a12/gnu/CMakeLists.txt
index 531df96e..d03910d1 100644
--- a/ports/cortex_a12/gnu/CMakeLists.txt
+++ b/ports/cortex_a12/gnu/CMakeLists.txt
@@ -28,6 +28,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a15/gnu/CMakeLists.txt b/ports/cortex_a15/gnu/CMakeLists.txt
index 531df96e..d03910d1 100644
--- a/ports/cortex_a15/gnu/CMakeLists.txt
+++ b/ports/cortex_a15/gnu/CMakeLists.txt
@@ -28,6 +28,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a17/gnu/CMakeLists.txt b/ports/cortex_a17/gnu/CMakeLists.txt
index 531df96e..d03910d1 100644
--- a/ports/cortex_a17/gnu/CMakeLists.txt
+++ b/ports/cortex_a17/gnu/CMakeLists.txt
@@ -28,6 +28,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a34/gnu/CMakeLists.txt b/ports/cortex_a34/gnu/CMakeLists.txt
index 25e5b6b8..12a58cbe 100644
--- a/ports/cortex_a34/gnu/CMakeLists.txt
+++ b/ports/cortex_a34/gnu/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a35/gnu/CMakeLists.txt b/ports/cortex_a35/gnu/CMakeLists.txt
index 25e5b6b8..12a58cbe 100644
--- a/ports/cortex_a35/gnu/CMakeLists.txt
+++ b/ports/cortex_a35/gnu/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a5/gnu/CMakeLists.txt b/ports/cortex_a5/gnu/CMakeLists.txt
index 531df96e..d03910d1 100644
--- a/ports/cortex_a5/gnu/CMakeLists.txt
+++ b/ports/cortex_a5/gnu/CMakeLists.txt
@@ -28,6 +28,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a53/gnu/CMakeLists.txt b/ports/cortex_a53/gnu/CMakeLists.txt
index 25e5b6b8..12a58cbe 100644
--- a/ports/cortex_a53/gnu/CMakeLists.txt
+++ b/ports/cortex_a53/gnu/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a55/gnu/CMakeLists.txt b/ports/cortex_a55/gnu/CMakeLists.txt
index 25e5b6b8..12a58cbe 100644
--- a/ports/cortex_a55/gnu/CMakeLists.txt
+++ b/ports/cortex_a55/gnu/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a57/gnu/CMakeLists.txt b/ports/cortex_a57/gnu/CMakeLists.txt
index 25e5b6b8..12a58cbe 100644
--- a/ports/cortex_a57/gnu/CMakeLists.txt
+++ b/ports/cortex_a57/gnu/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a65/gnu/CMakeLists.txt b/ports/cortex_a65/gnu/CMakeLists.txt
index 25e5b6b8..12a58cbe 100644
--- a/ports/cortex_a65/gnu/CMakeLists.txt
+++ b/ports/cortex_a65/gnu/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a65ae/gnu/CMakeLists.txt b/ports/cortex_a65ae/gnu/CMakeLists.txt
index 25e5b6b8..12a58cbe 100644
--- a/ports/cortex_a65ae/gnu/CMakeLists.txt
+++ b/ports/cortex_a65ae/gnu/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a7/gnu/CMakeLists.txt b/ports/cortex_a7/gnu/CMakeLists.txt
index 531df96e..d03910d1 100644
--- a/ports/cortex_a7/gnu/CMakeLists.txt
+++ b/ports/cortex_a7/gnu/CMakeLists.txt
@@ -28,6 +28,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a72/gnu/CMakeLists.txt b/ports/cortex_a72/gnu/CMakeLists.txt
index 25e5b6b8..12a58cbe 100644
--- a/ports/cortex_a72/gnu/CMakeLists.txt
+++ b/ports/cortex_a72/gnu/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a73/gnu/CMakeLists.txt b/ports/cortex_a73/gnu/CMakeLists.txt
index 25e5b6b8..12a58cbe 100644
--- a/ports/cortex_a73/gnu/CMakeLists.txt
+++ b/ports/cortex_a73/gnu/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a75/gnu/CMakeLists.txt b/ports/cortex_a75/gnu/CMakeLists.txt
index 25e5b6b8..12a58cbe 100644
--- a/ports/cortex_a75/gnu/CMakeLists.txt
+++ b/ports/cortex_a75/gnu/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a76/gnu/CMakeLists.txt b/ports/cortex_a76/gnu/CMakeLists.txt
index 25e5b6b8..12a58cbe 100644
--- a/ports/cortex_a76/gnu/CMakeLists.txt
+++ b/ports/cortex_a76/gnu/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a76ae/gnu/CMakeLists.txt b/ports/cortex_a76ae/gnu/CMakeLists.txt
index 25e5b6b8..12a58cbe 100644
--- a/ports/cortex_a76ae/gnu/CMakeLists.txt
+++ b/ports/cortex_a76ae/gnu/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a77/gnu/CMakeLists.txt b/ports/cortex_a77/gnu/CMakeLists.txt
index 25e5b6b8..12a58cbe 100644
--- a/ports/cortex_a77/gnu/CMakeLists.txt
+++ b/ports/cortex_a77/gnu/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a8/gnu/CMakeLists.txt b/ports/cortex_a8/gnu/CMakeLists.txt
index 531df96e..d03910d1 100644
--- a/ports/cortex_a8/gnu/CMakeLists.txt
+++ b/ports/cortex_a8/gnu/CMakeLists.txt
@@ -28,6 +28,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_a9/gnu/CMakeLists.txt b/ports/cortex_a9/gnu/CMakeLists.txt
index 531df96e..d03910d1 100644
--- a/ports/cortex_a9/gnu/CMakeLists.txt
+++ b/ports/cortex_a9/gnu/CMakeLists.txt
@@ -28,6 +28,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_m0/gnu/CMakeLists.txt b/ports/cortex_m0/gnu/CMakeLists.txt
index 0e3cc8ec..3c318e65 100755
--- a/ports/cortex_m0/gnu/CMakeLists.txt
+++ b/ports/cortex_m0/gnu/CMakeLists.txt
@@ -16,6 +16,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_m0/iar/CMakeLists.txt b/ports/cortex_m0/iar/CMakeLists.txt
index 57be3aeb..e9583502 100644
--- a/ports/cortex_m0/iar/CMakeLists.txt
+++ b/ports/cortex_m0/iar/CMakeLists.txt
@@ -16,6 +16,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_m23/gnu/CMakeLists.txt b/ports/cortex_m23/gnu/CMakeLists.txt
index 93f52d68..e7c71e07 100644
--- a/ports/cortex_m23/gnu/CMakeLists.txt
+++ b/ports/cortex_m23/gnu/CMakeLists.txt
@@ -28,6 +28,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_m3/gnu/CMakeLists.txt b/ports/cortex_m3/gnu/CMakeLists.txt
index 71e2d4f2..1507e736 100755
--- a/ports/cortex_m3/gnu/CMakeLists.txt
+++ b/ports/cortex_m3/gnu/CMakeLists.txt
@@ -13,6 +13,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_m3/iar/CMakeLists.txt b/ports/cortex_m3/iar/CMakeLists.txt
index 57be3aeb..e9583502 100644
--- a/ports/cortex_m3/iar/CMakeLists.txt
+++ b/ports/cortex_m3/iar/CMakeLists.txt
@@ -16,6 +16,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_m33/ac6/CMakeLists.txt b/ports/cortex_m33/ac6/CMakeLists.txt
index 5ad3b8e7..81b479e0 100644
--- a/ports/cortex_m33/ac6/CMakeLists.txt
+++ b/ports/cortex_m33/ac6/CMakeLists.txt
@@ -16,6 +16,8 @@ target_sources(${PROJECT_NAME} PRIVATE
     ${CMAKE_CURRENT_LIST_DIR}/src/tx_timer_interrupt.S
 )
 
-target_include_directories(${PROJECT_NAME} PUBLIC
+target_include_directories(${PROJECT_NAME}
+    SYSTEM
+    PUBLIC
     inc
 )
diff --git a/ports/cortex_m33/gnu/CMakeLists.txt b/ports/cortex_m33/gnu/CMakeLists.txt
index 763a2696..a8e45b82 100644
--- a/ports/cortex_m33/gnu/CMakeLists.txt
+++ b/ports/cortex_m33/gnu/CMakeLists.txt
@@ -19,6 +19,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_m4/gnu/CMakeLists.txt b/ports/cortex_m4/gnu/CMakeLists.txt
index 71e2d4f2..1507e736 100755
--- a/ports/cortex_m4/gnu/CMakeLists.txt
+++ b/ports/cortex_m4/gnu/CMakeLists.txt
@@ -13,6 +13,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_m4/iar/CMakeLists.txt b/ports/cortex_m4/iar/CMakeLists.txt
index 57be3aeb..e9583502 100644
--- a/ports/cortex_m4/iar/CMakeLists.txt
+++ b/ports/cortex_m4/iar/CMakeLists.txt
@@ -16,6 +16,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_m52/ac6/CMakeLists.txt b/ports/cortex_m52/ac6/CMakeLists.txt
index 5ad3b8e7..81b479e0 100644
--- a/ports/cortex_m52/ac6/CMakeLists.txt
+++ b/ports/cortex_m52/ac6/CMakeLists.txt
@@ -16,6 +16,8 @@ target_sources(${PROJECT_NAME} PRIVATE
     ${CMAKE_CURRENT_LIST_DIR}/src/tx_timer_interrupt.S
 )
 
-target_include_directories(${PROJECT_NAME} PUBLIC
+target_include_directories(${PROJECT_NAME}
+    SYSTEM
+    PUBLIC
     inc
 )
diff --git a/ports/cortex_m52/gnu/CMakeLists.txt b/ports/cortex_m52/gnu/CMakeLists.txt
index 763a2696..a8e45b82 100644
--- a/ports/cortex_m52/gnu/CMakeLists.txt
+++ b/ports/cortex_m52/gnu/CMakeLists.txt
@@ -19,6 +19,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_m55/ac6/CMakeLists.txt b/ports/cortex_m55/ac6/CMakeLists.txt
index 5ad3b8e7..81b479e0 100644
--- a/ports/cortex_m55/ac6/CMakeLists.txt
+++ b/ports/cortex_m55/ac6/CMakeLists.txt
@@ -16,6 +16,8 @@ target_sources(${PROJECT_NAME} PRIVATE
     ${CMAKE_CURRENT_LIST_DIR}/src/tx_timer_interrupt.S
 )
 
-target_include_directories(${PROJECT_NAME} PUBLIC
+target_include_directories(${PROJECT_NAME}
+    SYSTEM
+    PUBLIC
     inc
 )
diff --git a/ports/cortex_m55/gnu/CMakeLists.txt b/ports/cortex_m55/gnu/CMakeLists.txt
index 763a2696..a8e45b82 100644
--- a/ports/cortex_m55/gnu/CMakeLists.txt
+++ b/ports/cortex_m55/gnu/CMakeLists.txt
@@ -19,6 +19,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_m7/gnu/CMakeLists.txt b/ports/cortex_m7/gnu/CMakeLists.txt
index 6a8d5852..7285f9d4 100755
--- a/ports/cortex_m7/gnu/CMakeLists.txt
+++ b/ports/cortex_m7/gnu/CMakeLists.txt
@@ -11,6 +11,8 @@ target_sources(${PROJECT_NAME} PRIVATE
     # {{END_TARGET_SOURCES}}
 )
 
-target_include_directories(${PROJECT_NAME} PUBLIC
+target_include_directories(${PROJECT_NAME}
+    SYSTEM
+    PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_m7/iar/CMakeLists.txt b/ports/cortex_m7/iar/CMakeLists.txt
index 57be3aeb..e9583502 100644
--- a/ports/cortex_m7/iar/CMakeLists.txt
+++ b/ports/cortex_m7/iar/CMakeLists.txt
@@ -16,6 +16,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_m85/ac6/CMakeLists.txt b/ports/cortex_m85/ac6/CMakeLists.txt
index 5ad3b8e7..81b479e0 100644
--- a/ports/cortex_m85/ac6/CMakeLists.txt
+++ b/ports/cortex_m85/ac6/CMakeLists.txt
@@ -16,6 +16,8 @@ target_sources(${PROJECT_NAME} PRIVATE
     ${CMAKE_CURRENT_LIST_DIR}/src/tx_timer_interrupt.S
 )
 
-target_include_directories(${PROJECT_NAME} PUBLIC
+target_include_directories(${PROJECT_NAME}
+    SYSTEM
+    PUBLIC
     inc
 )
diff --git a/ports/cortex_m85/gnu/CMakeLists.txt b/ports/cortex_m85/gnu/CMakeLists.txt
index 763a2696..a8e45b82 100644
--- a/ports/cortex_m85/gnu/CMakeLists.txt
+++ b/ports/cortex_m85/gnu/CMakeLists.txt
@@ -19,6 +19,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_r4/gnu/CMakeLists.txt b/ports/cortex_r4/gnu/CMakeLists.txt
index a5d37879..b40b5b99 100644
--- a/ports/cortex_r4/gnu/CMakeLists.txt
+++ b/ports/cortex_r4/gnu/CMakeLists.txt
@@ -28,6 +28,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_r5/gnu/CMakeLists.txt b/ports/cortex_r5/gnu/CMakeLists.txt
index bb1864ef..46d1dadb 100644
--- a/ports/cortex_r5/gnu/CMakeLists.txt
+++ b/ports/cortex_r5/gnu/CMakeLists.txt
@@ -28,6 +28,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/cortex_r52/gnu/CMakeLists.txt b/ports/cortex_r52/gnu/CMakeLists.txt
index 26ca3028..957e2cbe 100644
--- a/ports/cortex_r52/gnu/CMakeLists.txt
+++ b/ports/cortex_r52/gnu/CMakeLists.txt
@@ -26,6 +26,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/linux/gnu/CMakeLists.txt b/ports/linux/gnu/CMakeLists.txt
index 073f4b7e..17138044 100644
--- a/ports/linux/gnu/CMakeLists.txt
+++ b/ports/linux/gnu/CMakeLists.txt
@@ -15,6 +15,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/rxv1/ccrx/CMakeLists.txt b/ports/rxv1/ccrx/CMakeLists.txt
index f2269c51..4118eb37 100644
--- a/ports/rxv1/ccrx/CMakeLists.txt
+++ b/ports/rxv1/ccrx/CMakeLists.txt
@@ -14,6 +14,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/rxv1/gnu/CMakeLists.txt b/ports/rxv1/gnu/CMakeLists.txt
index 9357c697..1735b774 100644
--- a/ports/rxv1/gnu/CMakeLists.txt
+++ b/ports/rxv1/gnu/CMakeLists.txt
@@ -14,6 +14,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/rxv2/ccrx/CMakeLists.txt b/ports/rxv2/ccrx/CMakeLists.txt
index f2269c51..4118eb37 100644
--- a/ports/rxv2/ccrx/CMakeLists.txt
+++ b/ports/rxv2/ccrx/CMakeLists.txt
@@ -14,6 +14,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/rxv2/gnu/CMakeLists.txt b/ports/rxv2/gnu/CMakeLists.txt
index 9357c697..1735b774 100644
--- a/ports/rxv2/gnu/CMakeLists.txt
+++ b/ports/rxv2/gnu/CMakeLists.txt
@@ -14,6 +14,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/rxv3/ccrx/CMakeLists.txt b/ports/rxv3/ccrx/CMakeLists.txt
index f2269c51..4118eb37 100644
--- a/ports/rxv3/ccrx/CMakeLists.txt
+++ b/ports/rxv3/ccrx/CMakeLists.txt
@@ -14,6 +14,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/rxv3/gnu/CMakeLists.txt b/ports/rxv3/gnu/CMakeLists.txt
index 9357c697..1735b774 100644
--- a/ports/rxv3/gnu/CMakeLists.txt
+++ b/ports/rxv3/gnu/CMakeLists.txt
@@ -14,6 +14,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/win32/vs_2019/CMakeLists.txt b/ports/win32/vs_2019/CMakeLists.txt
index 5a766f06..d2210a8f 100644
--- a/ports/win32/vs_2019/CMakeLists.txt
+++ b/ports/win32/vs_2019/CMakeLists.txt
@@ -15,6 +15,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/win64/vs_2022/CMakeLists.txt b/ports/win64/vs_2022/CMakeLists.txt
index 328b89d1..073f0f99 100644
--- a/ports/win64/vs_2022/CMakeLists.txt
+++ b/ports/win64/vs_2022/CMakeLists.txt
@@ -14,6 +14,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports/xtensa/xcc/CMakeLists.txt b/ports/xtensa/xcc/CMakeLists.txt
index 31768e58..dbc3eeb6 100644
--- a/ports/xtensa/xcc/CMakeLists.txt
+++ b/ports/xtensa/xcc/CMakeLists.txt
@@ -26,6 +26,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_arch/ARMv7-A/threadx/ports/gnu/CMakeLists.txt b/ports_arch/ARMv7-A/threadx/ports/gnu/CMakeLists.txt
index 531df96e..d03910d1 100644
--- a/ports_arch/ARMv7-A/threadx/ports/gnu/CMakeLists.txt
+++ b/ports_arch/ARMv7-A/threadx/ports/gnu/CMakeLists.txt
@@ -28,6 +28,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_arch/ARMv7-M/threadx/gnu/CMakeLists.txt b/ports_arch/ARMv7-M/threadx/gnu/CMakeLists.txt
index ab9464d2..4abc1c06 100644
--- a/ports_arch/ARMv7-M/threadx/gnu/CMakeLists.txt
+++ b/ports_arch/ARMv7-M/threadx/gnu/CMakeLists.txt
@@ -13,6 +13,8 @@ target_sources(${PROJECT_NAME} PRIVATE
     # {{END_TARGET_SOURCES}}
 )
 
-target_include_directories(${PROJECT_NAME} PUBLIC
+target_include_directories(${PROJECT_NAME}
+    SYSTEM
+    PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_arch/ARMv8-A/threadx/ports/gnu/CMakeLists.txt b/ports_arch/ARMv8-A/threadx/ports/gnu/CMakeLists.txt
index 25e5b6b8..12a58cbe 100644
--- a/ports_arch/ARMv8-A/threadx/ports/gnu/CMakeLists.txt
+++ b/ports_arch/ARMv8-A/threadx/ports/gnu/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_arch/ARMv8-A/threadx_smp/ports/gnu/CMakeLists.txt b/ports_arch/ARMv8-A/threadx_smp/ports/gnu/CMakeLists.txt
index a1030280..b4758a85 100644
--- a/ports_arch/ARMv8-A/threadx_smp/ports/gnu/CMakeLists.txt
+++ b/ports_arch/ARMv8-A/threadx_smp/ports/gnu/CMakeLists.txt
@@ -33,6 +33,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_arch/ARMv8-M/threadx/ac6/CMakeLists.txt b/ports_arch/ARMv8-M/threadx/ac6/CMakeLists.txt
index 5ad3b8e7..81b479e0 100644
--- a/ports_arch/ARMv8-M/threadx/ac6/CMakeLists.txt
+++ b/ports_arch/ARMv8-M/threadx/ac6/CMakeLists.txt
@@ -16,6 +16,8 @@ target_sources(${PROJECT_NAME} PRIVATE
     ${CMAKE_CURRENT_LIST_DIR}/src/tx_timer_interrupt.S
 )
 
-target_include_directories(${PROJECT_NAME} PUBLIC
+target_include_directories(${PROJECT_NAME}
+    SYSTEM
+    PUBLIC
     inc
 )
diff --git a/ports_arch/ARMv8-M/threadx/gnu/CMakeLists.txt b/ports_arch/ARMv8-M/threadx/gnu/CMakeLists.txt
index 763a2696..a8e45b82 100644
--- a/ports_arch/ARMv8-M/threadx/gnu/CMakeLists.txt
+++ b/ports_arch/ARMv8-M/threadx/gnu/CMakeLists.txt
@@ -19,6 +19,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a34_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a34_smp/gnu/CMakeLists.txt
index a1030280..b4758a85 100644
--- a/ports_smp/cortex_a34_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a34_smp/gnu/CMakeLists.txt
@@ -33,6 +33,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a35_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a35_smp/gnu/CMakeLists.txt
index a1030280..b4758a85 100644
--- a/ports_smp/cortex_a35_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a35_smp/gnu/CMakeLists.txt
@@ -33,6 +33,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a53_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a53_smp/gnu/CMakeLists.txt
index a1030280..b4758a85 100644
--- a/ports_smp/cortex_a53_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a53_smp/gnu/CMakeLists.txt
@@ -33,6 +33,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a55_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a55_smp/gnu/CMakeLists.txt
index a1030280..b4758a85 100644
--- a/ports_smp/cortex_a55_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a55_smp/gnu/CMakeLists.txt
@@ -33,6 +33,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a57_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a57_smp/gnu/CMakeLists.txt
index a1030280..b4758a85 100644
--- a/ports_smp/cortex_a57_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a57_smp/gnu/CMakeLists.txt
@@ -33,6 +33,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a5_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a5_smp/gnu/CMakeLists.txt
index f0806658..d3b42149 100644
--- a/ports_smp/cortex_a5_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a5_smp/gnu/CMakeLists.txt
@@ -32,6 +32,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a5x_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a5x_smp/gnu/CMakeLists.txt
index 8e8f8cd0..dfbd61b3 100644
--- a/ports_smp/cortex_a5x_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a5x_smp/gnu/CMakeLists.txt
@@ -32,6 +32,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a65_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a65_smp/gnu/CMakeLists.txt
index a1030280..b4758a85 100644
--- a/ports_smp/cortex_a65_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a65_smp/gnu/CMakeLists.txt
@@ -33,6 +33,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a65ae_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a65ae_smp/gnu/CMakeLists.txt
index a1030280..b4758a85 100644
--- a/ports_smp/cortex_a65ae_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a65ae_smp/gnu/CMakeLists.txt
@@ -33,6 +33,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a72_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a72_smp/gnu/CMakeLists.txt
index a1030280..b4758a85 100644
--- a/ports_smp/cortex_a72_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a72_smp/gnu/CMakeLists.txt
@@ -33,6 +33,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a73_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a73_smp/gnu/CMakeLists.txt
index a1030280..b4758a85 100644
--- a/ports_smp/cortex_a73_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a73_smp/gnu/CMakeLists.txt
@@ -33,6 +33,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a75_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a75_smp/gnu/CMakeLists.txt
index a1030280..b4758a85 100644
--- a/ports_smp/cortex_a75_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a75_smp/gnu/CMakeLists.txt
@@ -33,6 +33,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a76_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a76_smp/gnu/CMakeLists.txt
index a1030280..b4758a85 100644
--- a/ports_smp/cortex_a76_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a76_smp/gnu/CMakeLists.txt
@@ -33,6 +33,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a76ae_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a76ae_smp/gnu/CMakeLists.txt
index a1030280..b4758a85 100644
--- a/ports_smp/cortex_a76ae_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a76ae_smp/gnu/CMakeLists.txt
@@ -33,6 +33,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a77_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a77_smp/gnu/CMakeLists.txt
index a1030280..b4758a85 100644
--- a/ports_smp/cortex_a77_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a77_smp/gnu/CMakeLists.txt
@@ -33,6 +33,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a78_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a78_smp/gnu/CMakeLists.txt
index a1030280..b4758a85 100644
--- a/ports_smp/cortex_a78_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a78_smp/gnu/CMakeLists.txt
@@ -33,6 +33,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a7_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a7_smp/gnu/CMakeLists.txt
index 7e271946..ef6be36c 100644
--- a/ports_smp/cortex_a7_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a7_smp/gnu/CMakeLists.txt
@@ -31,6 +31,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/cortex_a9_smp/gnu/CMakeLists.txt b/ports_smp/cortex_a9_smp/gnu/CMakeLists.txt
index 4b13e1a1..dd2c1a41 100644
--- a/ports_smp/cortex_a9_smp/gnu/CMakeLists.txt
+++ b/ports_smp/cortex_a9_smp/gnu/CMakeLists.txt
@@ -26,6 +26,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/linux/gnu/CMakeLists.txt b/ports_smp/linux/gnu/CMakeLists.txt
index 67209ee7..23d4a1a5 100644
--- a/ports_smp/linux/gnu/CMakeLists.txt
+++ b/ports_smp/linux/gnu/CMakeLists.txt
@@ -28,6 +28,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/mips32_interaptiv_smp/gnu/CMakeLists.txt b/ports_smp/mips32_interaptiv_smp/gnu/CMakeLists.txt
index 1c0ad10d..6f813331 100644
--- a/ports_smp/mips32_interaptiv_smp/gnu/CMakeLists.txt
+++ b/ports_smp/mips32_interaptiv_smp/gnu/CMakeLists.txt
@@ -28,6 +28,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/ports_smp/win64/vs_2022/CMakeLists.txt b/ports_smp/win64/vs_2022/CMakeLists.txt
index 982f9684..447a0026 100644
--- a/ports_smp/win64/vs_2022/CMakeLists.txt
+++ b/ports_smp/win64/vs_2022/CMakeLists.txt
@@ -23,6 +23,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}/inc
 )
diff --git a/scripts/install.sh b/scripts/install.sh
index c142370d..84279c4e 100755
--- a/scripts/install.sh
+++ b/scripts/install.sh
@@ -35,7 +35,8 @@ rm -rf /opt/hostedtoolcache
 #
 # The Acquire options are kept anyway, since they make a slow mirror give up
 # sooner. The loop covers a mirror that is down rather than merely slow. The
-# explicit exits stop a failed fetch from being carried forward into a build.
+# explicit exits stop a failed fetch from being carried forward into a build,
+# with one deliberate exception noted at the update below.
 APT_OPTIONS=(-o Acquire::Retries=3
              -o Acquire::http::Timeout=20
              -o Acquire::https::Timeout=20)
@@ -63,7 +64,31 @@ retry() {
     return 1
 }
 
-retry sudo "${TIMEOUT[@]}" apt-get "${APT_OPTIONS[@]}" update || exit 1
+# THE UPDATE IS NOT THE GATE, AND IT MUST NOT BE.  apt-get update fails if ANY
+# configured repository serves a bad index, including ones this project does
+# not use.  On a GitHub runner the image carries Google's and Microsoft's
+# repositories, and a Hash Sum mismatch from Google's -- their CDN caught
+# mid-publish, index and Release file eight hours apart -- failed this script
+# three attempts running and turned a build red over a browser nobody was
+# installing.
+#
+# The alternative of disabling third-party sources before updating is wrong
+# here: this script also runs on a contributor's own machine, where silently
+# rewriting their apt configuration would be a far worse thing to do than
+# tolerating a stale index.
+#
+# So a failed update WARNS and the install below is the gate.  Nothing is
+# weakened by that: apt-get install still fails hard on a package it cannot
+# find, so an archive that is genuinely unreachable still stops the script --
+# one step later, and saying which package it could not get.
+if ! retry sudo "${TIMEOUT[@]}" apt-get "${APT_OPTIONS[@]}" update; then
+    echo ""
+    echo "install.sh: apt-get update did not fully succeed."
+    echo "install.sh: continuing, because a repository this project does not"
+    echo "install.sh: use can fail an update.  The install below is the real"
+    echo "install.sh: gate and fails if any package needed is unavailable."
+    echo ""
+fi
 retry sudo "${TIMEOUT[@]}" apt-get "${APT_OPTIONS[@]}" install -y \
     gcc-multilib \
     git \
diff --git a/test/smp/cmake/threadx_smp/CMakeLists.txt b/test/smp/cmake/threadx_smp/CMakeLists.txt
index 568fece4..a2e17636 100644
--- a/test/smp/cmake/threadx_smp/CMakeLists.txt
+++ b/test/smp/cmake/threadx_smp/CMakeLists.txt
@@ -45,6 +45,7 @@ else()
 endif()
 configure_file(${TX_USER_FILE} ${CUSTOM_INC_DIR}/tx_user.h COPYONLY)
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CUSTOM_INC_DIR}
 )
diff --git a/test/smp/cmake/threadx_smp/common_smp/CMakeLists.txt b/test/smp/cmake/threadx_smp/common_smp/CMakeLists.txt
index 646b200b..770379af 100644
--- a/test/smp/cmake/threadx_smp/common_smp/CMakeLists.txt
+++ b/test/smp/cmake/threadx_smp/common_smp/CMakeLists.txt
@@ -214,6 +214,7 @@ target_sources(${PROJECT_NAME}
 
 # Add the Common/inc directory to the project include list
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CURRENT_DIR}/inc
 )
diff --git a/test/smp/cmake/threadx_smp/ports_smp/linux/gnu/CMakeLists.txt b/test/smp/cmake/threadx_smp/ports_smp/linux/gnu/CMakeLists.txt
index 9c51522c..64d97255 100644
--- a/test/smp/cmake/threadx_smp/ports_smp/linux/gnu/CMakeLists.txt
+++ b/test/smp/cmake/threadx_smp/ports_smp/linux/gnu/CMakeLists.txt
@@ -25,6 +25,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CURRENT_DIR}/inc
 )
diff --git a/test/smp/cmake/threadx_smp/ports_smp/win64/vs_2022/CMakeLists.txt b/test/smp/cmake/threadx_smp/ports_smp/win64/vs_2022/CMakeLists.txt
index 6b219bb2..8635647a 100644
--- a/test/smp/cmake/threadx_smp/ports_smp/win64/vs_2022/CMakeLists.txt
+++ b/test/smp/cmake/threadx_smp/ports_smp/win64/vs_2022/CMakeLists.txt
@@ -24,6 +24,7 @@ target_sources(${PROJECT_NAME}
 )
 
 target_include_directories(${PROJECT_NAME}
+    SYSTEM
     PUBLIC
     ${CURRENT_DIR}/inc
 )
diff --git a/utility/rtos_compatibility_layers/posix/CMakeLists.txt b/utility/rtos_compatibility_layers/posix/CMakeLists.txt
index 6ddcd6a8..8cf3ab9a 100644
--- a/utility/rtos_compatibility_layers/posix/CMakeLists.txt
+++ b/utility/rtos_compatibility_layers/posix/CMakeLists.txt
@@ -12,6 +12,7 @@
 add_library(posix-threadx EXCLUDE_FROM_ALL)
 
 target_include_directories(posix-threadx
+    SYSTEM
     PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}
 )