avoid generating some OER object code if not -gen-OER
diff --git a/examples/sample.makefile.regen b/examples/sample.makefile.regen
index 4f45d61..6f8270e 100755
--- a/examples/sample.makefile.regen
+++ b/examples/sample.makefile.regen
@@ -38,13 +38,13 @@
 	exit 1
 fi
 
-EXTRA_CFLAGS="-DJUNKTEST -D_DEFAULT_SOURCE ${CFLAGS}"
-test -f config.h && EXTRA_CFLAGS="-DHAVE_CONFIG_H ${EXTRA_CFLAGS}"
-test -n "$TITLE" && EXTRA_CFLAGS="-DASN_CONVERTER_TITLE=\"$TITLE\" ${EXTRA_CFLAGS}"
+EXTRA_CPPFLAGS="-DJUNKTEST -D_DEFAULT_SOURCE ${CPPFLAGS}"
+test -f config.h && EXTRA_CPPFLAGS="-DHAVE_CONFIG_H ${EXTRA_CPPFLAGS}"
+test -n "$TITLE" && EXTRA_CPPFLAGS="-DASN_CONVERTER_TITLE=\"$TITLE\" ${EXTRA_CPPFLAGS}"
 
 set -x
 cat Makefile.am.sample						\
-	| sed -e "s/^CFLAGS += /CFLAGS += ${EXTRA_CFLAGS} /"	\
+	| sed -e "s/^CPPFLAGS += /CPPFLAGS += ${EXTRA_CPPFLAGS} /"	\
 	| sed -e "s/^all: /all: ${ASN1PDU}.c /"			\
 	| sed -e "s/progname/${PROGNAME}/"			\
 	> Makefile.$$
@@ -62,7 +62,7 @@
 	echo "	ASN1MODULES=\"${ASN1MODULES}\" \\"
 	echo "	ASN1PDU=${ASN1PDU} \\"
 	echo "	PROGNAME=${PROGNAME} \\"
-	echo "	CFLAGS=\"${CFLAGS}\" \\"
+	echo "	CPPFLAGS=\"${CPPFLAGS}\" \\"
 	echo "	$0"
 	echo
 	echo 'check: ${TARGET} check-ber check-xer check-per'