diff --git a/c/src/exec/score/cpu/unix/ChangeLog b/c/src/exec/score/cpu/unix/ChangeLog
index 6f3bce91e7..6421ddaadf 100644
--- a/c/src/exec/score/cpu/unix/ChangeLog
+++ b/c/src/exec/score/cpu/unix/ChangeLog
@@ -1,3 +1,7 @@
+2000-09-11	Ralf Corsepius <corsepiu@faw.uni-ulm.de>
+
+	* Makefile.am: Use += to set up AM_CPPFLAGS.
+
 2000-09-04	Ralf Corsepius <corsepiu@faw.uni-ulm.de>
 
 	* rtems/score/Makefile.am: Use PROJECT_TOPdir in path to gensize.
diff --git a/c/src/exec/score/cpu/unix/Makefile.am b/c/src/exec/score/cpu/unix/Makefile.am
index 27293d32e0..84df350bfb 100644
--- a/c/src/exec/score/cpu/unix/Makefile.am
+++ b/c/src/exec/score/cpu/unix/Makefile.am
@@ -11,7 +11,7 @@ include $(top_srcdir)/../../../../../../automake/lib.am
 
 SUBDIRS = rtems
 
-AM_CPPFLAGS = -DCPU_SYNC_IO $(LIBC_DEFINES)
+AM_CPPFLAGS += -DCPU_SYNC_IO $(LIBC_DEFINES)
 
 C_FILES = cpu.c
 C_O_FILES = $(C_FILES:%.c=$(ARCH)/%.o)
diff --git a/cpukit/score/cpu/unix/ChangeLog b/cpukit/score/cpu/unix/ChangeLog
index 6f3bce91e7..6421ddaadf 100644
--- a/cpukit/score/cpu/unix/ChangeLog
+++ b/cpukit/score/cpu/unix/ChangeLog
@@ -1,3 +1,7 @@
+2000-09-11	Ralf Corsepius <corsepiu@faw.uni-ulm.de>
+
+	* Makefile.am: Use += to set up AM_CPPFLAGS.
+
 2000-09-04	Ralf Corsepius <corsepiu@faw.uni-ulm.de>
 
 	* rtems/score/Makefile.am: Use PROJECT_TOPdir in path to gensize.
diff --git a/cpukit/score/cpu/unix/Makefile.am b/cpukit/score/cpu/unix/Makefile.am
index 27293d32e0..84df350bfb 100644
--- a/cpukit/score/cpu/unix/Makefile.am
+++ b/cpukit/score/cpu/unix/Makefile.am
@@ -11,7 +11,7 @@ include $(top_srcdir)/../../../../../../automake/lib.am
 
 SUBDIRS = rtems
 
-AM_CPPFLAGS = -DCPU_SYNC_IO $(LIBC_DEFINES)
+AM_CPPFLAGS += -DCPU_SYNC_IO $(LIBC_DEFINES)
 
 C_FILES = cpu.c
 C_O_FILES = $(C_FILES:%.c=$(ARCH)/%.o)