--- gource-0.40/m4/ax_check_glu.m4~	2013-04-24 03:58:51.000000000 +0200
+++ gource-0.40/m4/ax_check_glu.m4	2015-06-27 12:04:05.304524114 +0200
@@ -131,7 +131,7 @@
 # else
 #   include <OpenGL/glu.h>
 # endif]],
-                                        [[GLvoid (*func)(...); gluTessCallback(0, 0, func)]])],
+                                        [[GLvoid (*func)(); gluTessCallback(0, 0, func)]])],
                                         [ax_cv_varargs_glu_tesscb=yes])
                       CXXFLAGS=$ax_save_CXXFLAGS
                       AC_LANG_POP([C++])])