better error message

diff --git a/m4/hooks.m4 b/m4/hooks.m4
index 081380f867e85dbd91516e3e47f117ba4f490630..7e51acbce8bbca0106b6789cbe8e6234632b7d36 100644 (file)
--- a/m4/hooks.m4
+++ b/m4/hooks.m4
@@ -86,7 +86,7 @@ if test "$cryptolib" = "nettle";then
     if test "$ac_cv_libnettle" != yes; then
       AC_MSG_ERROR([[
   *** 
-  *** Libnettle 2.4 was not found. 
+  *** Libnettle 2.4 was not found. You must compile nettle with gmp support.
   ]])
     fi
 else