Source
--- gl/m4/gc.m4.orig 2012-05-21 09:07:06.000000000 -0500
+++ gl/m4/gc.m4 2014-07-22 06:35:50.000000000 -0500
/* GCRY_MODULE_ID_USER was added in 1.4.4 and gc-libgcrypt.c
will fail on startup if we don't have 1.4.4 or later, so
test for it early. */
-#if !defined GCRY_MODULE_ID_USER
+#if !defined GCRY_MODULE_ID_USER && !defined GCRYPT_VERSION_NUMBER
error too old libgcrypt
#endif
])