diff --git a/acx_nlnetlabs.m4 b/acx_nlnetlabs.m4
index 993ad16c1..64b376238 100644
--- a/acx_nlnetlabs.m4
+++ b/acx_nlnetlabs.m4
@@ -889,10 +889,10 @@ AC_CACHE_VAL(cv_cc_deprecated_$cache,
 echo '$3' >conftest.c
 echo 'void f(){ $2 }' >>conftest.c
 echo "deprecation test for $1 results in"
-echo "`$CC -c conftest.c 2>&1 `"
+echo "`$CC $CPPFLAGS $CFLAGS -c conftest.c 2>&1 `"
 echo "and from the commandline"
-$CC -c conftest.c
-if test -z "`$CC -c conftest.c 2>&1 | grep deprecated`"; then
+$CC $CPPFLAGS $CFLAGS -c conftest.c
+if test -z "`$CC $CPPFLAGS $CFLAGS -c conftest.c 2>&1 | grep deprecated`"; then
 eval "cv_cc_deprecated_$cache=no"
 else
 eval "cv_cc_deprecated_$cache=yes"
diff --git a/configure b/configure
index 0407db3a0..d991794f2 100755
--- a/configure
+++ b/configure
@@ -20152,10 +20152,10 @@ echo '
 ' >conftest.c
 echo 'void f(){ (void)daemon(0, 0); }' >>conftest.c
 echo "deprecation test for daemon results in"
-echo "`$CC -c conftest.c 2>&1 `"
+echo "`$CC $CPPFLAGS $CFLAGS -c conftest.c 2>&1 `"
 echo "and from the commandline"
-$CC -c conftest.c
-if test -z "`$CC -c conftest.c 2>&1 | grep deprecated`"; then
+$CC $CPPFLAGS $CFLAGS -c conftest.c
+if test -z "`$CC $CPPFLAGS $CFLAGS -c conftest.c 2>&1 | grep deprecated`"; then
 eval "cv_cc_deprecated_$cache=no"
 else
 eval "cv_cc_deprecated_$cache=yes"