diff --git a/btrfs_installed_tag.sh b/btrfs_installed_tag.sh
index c4d99f377f..f2f2b33c83 100755
--- a/btrfs_installed_tag.sh
+++ b/btrfs_installed_tag.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-cc -E - > /dev/null 2> /dev/null << EOF
+${CPP:-${CC:-cc} -E} ${CPPFLAGS} - > /dev/null 2> /dev/null << EOF
 #include <btrfs/ioctl.h>
 EOF
 if test $? -ne 0 ; then
diff --git a/btrfs_tag.sh b/btrfs_tag.sh
index 59cb969ad6..ea753d4d02 100755
--- a/btrfs_tag.sh
+++ b/btrfs_tag.sh
@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-cc -E - > /dev/null 2> /dev/null << EOF
+${CPP:-${CC:-cc} -E} ${CPPFLAGS} - > /dev/null 2> /dev/null << EOF
 #include <btrfs/version.h>
 EOF
 if test $? -ne 0 ; then
diff --git a/libdm_tag.sh b/libdm_tag.sh
index d3668aab1c..815b5d914e 100755
--- a/libdm_tag.sh
+++ b/libdm_tag.sh
@@ -2,7 +2,7 @@
 tmpdir="$PWD/tmp.$RANDOM"
 mkdir -p "$tmpdir"
 trap 'rm -fr "$tmpdir"' EXIT
-cc -o "$tmpdir"/libdm_tag -ldevmapper -x c - > /dev/null 2> /dev/null << EOF
+${CC:-cc} ${CFLAGS} ${CPPFLAGS} ${LDFLAGS} -o "$tmpdir"/libdm_tag -x c - -ldevmapper > /dev/null 2> /dev/null << EOF
 #include <libdevmapper.h>
 int main() {
 	struct dm_task *task;