test fltk version inside #if HAVE_FLTK

Common/GmshUI.h

@@ -21,14 +21,8 @@
 // Please report all bugs and problems to <gmsh@geuz.org>.
 
 #if defined(HAVE_FLTK)
+
 #  include <FL/Fl.H>
-#  include <FL/gl.h>
-#  if defined(__APPLE__)
-#    include <OpenGL/glu.h>
-#  else
-#    include <GL/glu.h>
-#  endif
-#endif
 
 // Gmsh requires FLTK 1.1.5 or above (the new dynamic menus don't
 // work with older FLTK versions due to a bug in Fl_Scroll.clear())
@@ -40,4 +34,13 @@
 #    error "Gmsh requires FLTK branch 1.1"
 #  endif
 
+#  include <FL/gl.h>
+#  if defined(__APPLE__)
+#    include <OpenGL/glu.h>
+#  else
+#    include <GL/glu.h>
+#  endif
+
+#endif
+
 #endif