Include configuration file to headers
Add inclusion to configration file in header files,
instead of relying on other header files to include
the configuration file. This issue resolves #1371
diff --git a/include/mbedtls/gcm.h b/include/mbedtls/gcm.h
index 93d15ee..16092fa 100644
--- a/include/mbedtls/gcm.h
+++ b/include/mbedtls/gcm.h
@@ -33,6 +33,12 @@
#ifndef MBEDTLS_GCM_H
#define MBEDTLS_GCM_H
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
#include "cipher.h"
#include <stdint.h>