--- autoconf/ast_check_raii.m4	(Asterisk 13.21.1)
+++ autoconf/ast_check_raii.m4	(working copy)
@@ -36 +36 @@
-			if test "`echo "int main(){return ^{return 42;}();}" | ${CC} -o /dev/null -fblocks -x c - 2>&1`" = ""; then
+			if test "`echo 'int main(){return ^{return 42;}();}' | ${CC} -o /dev/null -fblocks -x c - 2>&1`" = ""; then
@@ -40 +40 @@
-			elif test "`echo "int main(){return ^{return 42;}();}" | ${CC} -o /dev/null -fblocks -x c -lBlocksRuntime - 2>&1`" = ""; then
+			elif test "`echo 'int main(){return ^{return 42;}();}' | ${CC} -o /dev/null -fblocks -x c -lBlocksRuntime - 2>&1`" = ""; then