diff -r 82cd9f1d94cb -r ebdecbbb2f79 test/make/toolchain.sh
--- a/test/make/toolchain.sh	Sat Aug 03 17:45:03 2019 +0200
+++ b/test/make/toolchain.sh	Tue Aug 13 21:01:48 2019 +0200
@@ -69,7 +69,7 @@
 do
     check_c_compiler $COMP
     if [ $? -ne 0 ]; then
-	    if [[ ! -z $CC ]]; then
+	    if [ ! -z "$CC" ]; then
         	if [ $COMP = $CC ]; then
             	echo "$CC is not a working C Compiler"
             	TOOLCHAIN_DETECTION_ERROR="error"
@@ -159,7 +159,7 @@
 # toolchain
 __EOF__
 	echo "CC = ${TOOLCHAIN_CC}" >> $TEMP_DIR/config.mk
-	if [[ ! -z $TOOLCHAIN_CXX ]]; then
+	if [ ! -z "$TOOLCHAIN_CXX" ]; then
 		echo "CXX = ${TOOLCHAIN_CXX}" >> $TEMP_DIR/config.mk
 	fi
     echo "LD = ${TOOLCHAIN_LD}" >> $TEMP_DIR/config.mk