Rewrite overcomplicated OpenGL test.

stepmania/autoconf/m4/opengl.m4

@@ -0,0 +1,22 @@
+AC_DEFUN(SM_OPENGL,
+[
+    AC_ARG_ENABLE(mesa, AC_HELP_STRING([--enable-mesa], [Use libMesaGL]), enable_mesa=$enableval, enable_mesa=no)
+
+    GL_LIBS=
+    if test "$enable_mesa" = "yes"; then
+	AC_CHECK_LIB(MesaGL, glPushMatrix, GL_LIBS=-lMesaGL)
+    fi
+
+    if test -z "$GL_LIBS"; then
+	AC_CHECK_LIB(GL, glPushMatrix, GL_LIBS="-lGL")
+    fi
+
+    AC_SUBST(GL_LIBS)
+    if test -z $GL_LIBS; then
+	AC_MSG_ERROR(["No OpenGL libraries could be found.  If you want
+to search for MesaGL, pass the "--enable-mesa" flag to configure.])
+    fi
+])
+
+
+

stepmania/configure.ac

@@ -19,7 +19,7 @@ test "$DEFAULT_CFLAGS" = "yes" && CFLAGS=""
 test "$DEFAULT_CXXFLAGS" = "yes" && CXXFLAGS=""
 test "$DEFAULT_LDFLAGS" = "yes" && LDFLAGS=""
 
-MDL_HAVE_OPENGL
+SM_OPENGL
 
 AM_PATH_SDL(1.2.6,enable_sdl=yes,enable_sdl=no)
 AM_CONDITIONAL(NHAVE_SDL, test x$enable_sdl = xno )