diff --git a/conf/Makefile.stm32 b/conf/Makefile.stm32
index 9a358a1765..c361279f28 100644
--- a/conf/Makefile.stm32
+++ b/conf/Makefile.stm32
@@ -38,17 +38,20 @@ OPT   = s
 #OPT   = 0
 
 # Programs location
-GCC_LIB_DIR=$(shell find -L /opt/paparazzi/stm32 ~/sat /opt/local -maxdepth 1 -type d -name arm-none-eabi 2>/dev/null | head -n 1 | xargs dirname )/arm-none-eabi/lib
+TOOLCHAIN_DIR=$(shell find -L /opt/paparazzi/stm32 ~/sat -maxdepth 1 -type d -name arm-none-eabi 2>/dev/null | head -n 1 | xargs dirname )
+GCC_BIN_DIR=$(TOOLCHAIN_DIR)/bin
+GCC_LIB_DIR=$(TOOLCHAIN_DIR)/arm-none-eabi/lib
 
 # Define programs and commands.
-CC   = $(shell which arm-none-eabi-gcc)
-LD   = $(shell which arm-none-eabi-gcc)
-CP   = $(shell which arm-none-eabi-objcopy)
-DMP  = $(shell which arm-none-eabi-objdump)
-NM   = $(shell which arm-none-eabi-nm)
-SIZE = $(shell which arm-none-eabi-size)
+GCC_BIN_PREFIX=$(GCC_BIN_DIR)/arm-none-eabi
+CC   = $(GCC_BIN_PREFIX)-gcc
+LD   = $(GCC_BIN_PREFIX)-gcc
+CP   = $(GCC_BIN_PREFIX)-objcopy
+DMP  = $(GCC_BIN_PREFIX)-objdump
+NM   = $(GCC_BIN_PREFIX)-nm
+SIZE = $(GCC_BIN_PREFIX)-size
 RM   = rm
-OOCD = $(shell which openocd)
+OOCD = $(TOOLCHAIN_DIR)/bin/openocd
 
 LOADER=/home/poine/work/stm32/stm32loader-a3c51c26ad6c/stm32loader.py