diff --git a/configure.ac b/configure.ac
index 4ffc3bb5..adf9ab7d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -481,6 +481,8 @@ AC_SUBST([rootsbindir])
 AC_SUBST([rootlibdir])
 AC_SUBST([LIBNTFS_3G_VERSION])
 AC_SUBST([LIBFUSE_LITE_LIBS])
+AC_SUBST([MKNTFS_CPPFLAGS])
+AC_SUBST([MKNTFS_LIBS])
 AC_SUBST([OUTPUT_FORMAT])
 AM_CONDITIONAL([FUSE_INTERNAL], [test "${with_fuse}" = "internal"])
 AM_CONDITIONAL([GENERATE_LDSCRIPT], [test "${enable_ldscript}" = "yes"])