default bsd make compilation does not include use preprocessor flags
diff --git a/tests/tests-c-compiler/check-assembly.sh b/tests/tests-c-compiler/check-assembly.sh
index f075ed9..9f096c0 100755
--- a/tests/tests-c-compiler/check-assembly.sh
+++ b/tests/tests-c-compiler/check-assembly.sh
@@ -67,7 +67,7 @@
COMMON_FLAGS= -I.
CFLAGS = \${COMMON_FLAGS} ${CFLAGS:-} -g -O0
-CPPFLAGS = -DSRCDIR=../${srcdir} ${CODECS_FLAGS}
+CFLAGS += -DSRCDIR=../${srcdir} ${CODECS_FLAGS}
CXXFLAGS = \${COMMON_FLAGS} ${CXXFLAGS}
LDFLAGS = ${LDFLAGS:-}
@@ -78,7 +78,7 @@
check-executable: \$(OBJS)
@rm -f *.core
- \$(CC) \$(CPPFLAGS) \$(CFLAGS) \$(LDFLAGS) -o check-executable \$(OBJS) -lm
+ \$(CC) \$(CFLAGS) \$(LDFLAGS) -o check-executable \$(OBJS) -lm
# Compile the corresponding .asn1 spec.
compiled-module: ${asn_module} ${abs_top_builddir}/asn1c/asn1c