Make configure.in give an error if no X-toolkit was detected.

* configure.in: Treat failure to find an X toolkit the same way we treat
failure to find X and image support.

1 files changed, 5 insertions, 2 deletions

diff --git a/configure.in b/configure.in
index f46645c1bd..5d2992539f 100644
--- a/configure.in
+++ b/configure.in
@@ -2036,8 +2036,11 @@ if test x"${USE_X_TOOLKIT}" = xmaybe || test x"${USE_X_TOOLKIT}" = xLUCID; then
     elif test x"${USE_X_TOOLKIT}" = xLUCID; then
       AC_MSG_ERROR([Lucid toolkit requires X11/Xaw include files])
     else
-      AC_MSG_RESULT([no; do not use toolkit by default])
-      USE_X_TOOLKIT=none
+      AC_MSG_ERROR([No X toolkit could be found.
+If you are sure you want Emacs compiled without an X toolkit, pass
+  --with-x-toolkit=no
+to configure.  Otherwise, install the development libraries for the toolkit
+that you want to use (e.g. Gtk+) and re-run configure.])
     fi
   fi
 fi