Fix tests configuration and building when only GLVND full OpenGL implementation is present.
diff --git a/test/configure.ac b/test/configure.ac
index a22e1a9..7aad98f 100644
--- a/test/configure.ac
+++ b/test/configure.ac
@@ -80,7 +80,15 @@ case "$host" in
ISUNIX="true"
EXE=""
MATHLIB="-lm"
+ dnl Use the new libOpenGL if present.
+ have_glvnd=no
+ AC_CHECK_LIB(OpenGL, glBegin,
+ [
+ dnl have_glvnd=yes
+ SYS_GL_LIBS="-lOpenGL"
+ ],[
SYS_GL_LIBS="-lGL"
+ ])
;;
esac
AC_SUBST(EXE)