--- gnubiff-2.2.17/configure.ac
+++ gnubiff-2.2.17/configure.ac
@@ -115,10 +115,15 @@
 dnl LIBSSL (for AES encryption/decryption)
 AC_CHECK_LIB(ssl, AES_encrypt, AC_DEFINE_UNQUOTED(HAVE_AES, 1, 
 			 Define to 1 if AES encryption is available), [
 	AC_CHECK_LIB(crypto, AES_encrypt, AC_DEFINE_UNQUOTED(HAVE_AES, 1))])
 
+dnl needed for gold
+AC_CHECK_LIB([X11],[XSync])
+
+AC_CHECK_LIB([gthread-2.0],[g_thread_init])
+
 dnl GLIB, GTK, ...
 GTK_REQUIRED="gtk+-3.0 >= 3.0.0"
 GMODULE_REQUIRED="gmodule-export-2.0 >= 2.4"
 X11="xproto x11"
 PKG_CHECK_MODULES(GNUBIFF_DEP,