--- src/configure
+++ src/configure
@@ -37,6 +37,7 @@
 #include <gnutls/openssl.h>
 #include <errno.h>
 #include <pthread.h>
+#include <gcrypt.h>
 
 GCRY_THREAD_OPTION_PTHREAD_IMPL;
 
--- src/mail.c
+++ src/mail.c
@@ -40,6 +40,7 @@
 #if defined(HAVE_GNUTLS)
 #include <gnutls/openssl.h>
 #include <pthread.h>
+#include <gcrypt.h>
 #define MD5Init		MD5_Init
 #define MD5Update	MD5_Update
 #define MD5Final	MD5_Final