diff --git a/conf/Makefile.stm32 b/conf/Makefile.stm32
index 00f1cb69137..707d8678611 100644
--- a/conf/Makefile.stm32
+++ b/conf/Makefile.stm32
@@ -44,10 +44,6 @@ TOOLCHAIN_DIR=$(shell dirname $(TOOLCHAIN))
 GCC_BIN_DIR=$(TOOLCHAIN_DIR)/bin
 GCC_LIB_DIR=$(TOOLCHAIN_DIR)/arm-none-eabi/lib
 
-# Detect if we are using the new libopencm3 or the old libopenstm32
-LIBOPENCM3_LIB=$(shell if [ -e "$(GCC_LIB_DIR)/libopencm3_stm32f1.a" ]; then echo "opencm3_stm32f1"; else echo "opencm3_stm32"; fi)
-LIBOPENCM3_DEFS=$(shell if [ -e "$(GCC_LIB_DIR)/libopencm3_stm32f1.a" ]; then echo "-DSTM32F1"; fi)
-
 # Define programs and commands.
 GCC_BIN_PREFIX=$(GCC_BIN_DIR)/arm-none-eabi
 CC   = $(GCC_BIN_PREFIX)-gcc
@@ -66,9 +62,14 @@ CP   = $(shell which arm-none-eabi-objcopy)
 DMP  = $(shell which arm-none-eabi-objdump)
 NM   = $(shell which arm-none-eabi-nm)
 SIZE = $(shell which arm-none-eabi-size)
+RM   = rm
 GCC_LIB_DIR=$(shell dirname `which arm-none-eabi-gcc`)/../arm-none-eabi/lib
 endif
 
+# Detect if we are using the new libopencm3 or the old libopenstm32
+LIBOPENCM3_LIB=$(shell if [ -e "$(GCC_LIB_DIR)/libopencm3_stm32f1.a" ]; then echo "opencm3_stm32f1"; else echo "opencm3_stm32"; fi)
+LIBOPENCM3_DEFS=$(shell if [ -e "$(GCC_LIB_DIR)/libopencm3_stm32f1.a" ]; then echo "-DSTM32F1"; fi)
+
 #first try to find OpenOCD in the path
 OOCD = $(shell which openocd)
 #if OpenOCD could not be found in the path, try the toolchain dir
diff --git a/sw/tools/gen_aircraft.ml b/sw/tools/gen_aircraft.ml
index 72b25931d4a..a9391293267 100644
--- a/sw/tools/gen_aircraft.ml
+++ b/sw/tools/gen_aircraft.ml
@@ -232,7 +232,10 @@ let parse_firmware = fun makefile_ac firmware ->
     (* print makefile for this target *)
     fprintf makefile_ac "\n###########\n# -target: '%s'\n" (Xml.attrib target "name");
     fprintf makefile_ac "ifeq ($(TARGET), %s)\n" (Xml.attrib target "name");
-    try fprintf makefile_ac "BOARD_PROCESSOR = %s\n" (Xml.attrib target "processor") with _ -> ();
+    begin (* Check for "processor" attribute *)
+      try fprintf makefile_ac "BOARD_PROCESSOR = %s\n" (Xml.attrib target "processor")
+      with _ -> ()
+    end;
     List.iter (print_firmware_configure makefile_ac) config;
     List.iter (print_firmware_configure makefile_ac) t_config;
     List.iter (print_firmware_define makefile_ac) defines;