gl_driver default is now configurable

acconfig.h

@@ -34,6 +34,9 @@
 /* Define this to the unshared game directory root */
 #undef FS_USERPATH
 
+/* Define this to the default GL dynamic lib */
+#undef GL_DRIVER
+
 /* Define this to use experimental code */
 #undef _EXPERIMENTAL_
 

configure.ac

@@ -1138,6 +1138,20 @@ AC_DEFINE_UNQUOTED(FS_PLUGINPATH, "$expanded_plugindir")
 AC_SUBST(plugindir)
 AC_SUBST(PLUGINDIR)
 
+AC_ARG_WITH(gl-driver,
+	[  --with-gl-driver        default gl dynamic lib name],
+	gl_driver=%withval,
+	gl_driver=auto
+)
+if test "$gl_driver" = auto; then
+	if test "$SYSTYPE" = WIN32; then
+		gl_driver="OPENGL32.DLL"
+	else
+		gl_driver="libGL.so.1"
+	fi
+fi
+AC_DEFINE_UNQUOTED(GL_DRIVER, "$gl_driver")
+
 dnl CFLAGS for release and devel versions
 AC_ARG_ENABLE(debug,
 	[  --disable-debug         compile without debugging],
@@ -1906,6 +1920,7 @@ AC_MSG_RESULT([
 	Plugin load directory       : $expanded_plugindir
 	Global configuration file   : $globalconf
 	User configuration file     : $userconf
+	OpenGL dynamic lib          : $gl_driver
 ])
 
 if test -d $srcdir/CVS; then

libs/video/renderer/r_cvar.c

@@ -190,11 +190,7 @@ R_Init_Cvars (void)
 	gl_lerp_anim = Cvar_Get ("gl_lerp_anim", "1", CVAR_ARCHIVE, NULL,
 							 "Toggles model animation interpolation");
 
-#ifdef _WIN32
-	gl_driver = Cvar_Get ("gl_driver", "OPENGL32.DLL", CVAR_ROM, NULL,
-#else
-	gl_driver = Cvar_Get ("gl_driver", "libGL.so.1", CVAR_ROM, NULL,
-#endif
+	gl_driver = Cvar_Get ("gl_driver", GL_DRIVER, CVAR_ROM, NULL,
 						  "The OpenGL library to use. (path optional)");
 	gl_lightmap_align = Cvar_Get ("gl_lightmap_align", "1", CVAR_NONE, NULL,
 								  "Workaround for nvidia slow path. Set to 4 "