# HG changeset patch
# User Mike Miller <mtmiller@octave.org>
# Date 1458600893 25200
# Node ID 79aa496c6d47d8ad14a69f96ae695146ee32b397
# Parent  e1c5aca1c7981b3664a8ae6d91ac445b2b4b6631
maint: Fix configure warning messages on missing OpenGL graphics support

* configure.ac (build_fltk_graphics): New variable, set when FLTK OpenGL
support is present and working.  (opengl_graphics): Set based on values of
build_fltk_graphics and build_qt_graphics shell variables.

diff -r e1c5aca1c798 -r 79aa496c6d47 configure.ac
--- a/configure.ac	Mon Mar 21 15:01:12 2016 -0700
+++ b/configure.ac	Mon Mar 21 15:54:53 2016 -0700
@@ -1552,6 +1552,8 @@
 ## Check for FLTK (www.fltk.org) library
 
 check_fltk=yes
+build_fltk_graphics=no
+
 AC_ARG_WITH([fltk],
   [AS_HELP_STRING([--without-fltk],
     [don't use FLTK libraries, disable OpenGL graphics with FLTK widgets])],
@@ -1626,6 +1628,7 @@
     if test $octave_cv_fltk_opengl_support = no; then
       warn_fltk_opengl="FLTK does not have OpenGL support.  OpenGL graphics with FLTK widgets will be disabled."
     else
+      build_fltk_graphics=yes
       AC_DEFINE(HAVE_FLTK, 1, [Define to 1 if FLTK is available.])
     fi
 
@@ -1639,7 +1642,7 @@
 AC_SUBST(FLTK_LDFLAGS)
 AC_SUBST(FLTK_LIBS)
 
-if test -n "$warn_qt_opengl" && test -n "$warn_fltk_opengl"; then
+if test $build_qt_graphics = no && test $build_fltk_graphics = no; then
   opengl_graphics=no
 else
   opengl_graphics=yes