--- ecryptfs-utils-99/m4/ac_python_devel.m4
+++ ecryptfs-utils-99/m4/ac_python_devel.m4
@@ -158,6 +158,8 @@
         AC_MSG_CHECKING([consistency of all components of python development environment])
         AC_LANG_PUSH([C])
         # save current global flags
+        ac_save_LIBS="$LIBS"
+        ac_save_CPPFLAGS="$CPPFLAGS"
         LIBS="$ac_save_LIBS $PYTHON_LDFLAGS"
         CPPFLAGS="$ac_save_CPPFLAGS $PYTHON_CPPFLAGS"
         AC_TRY_LINK([