From 3095735268677329127eb58e3d84aec5895d8ea3 Mon Sep 17 00:00:00 2001
From: gered <gered@blarg.ca>
Date: Sat, 9 Feb 2013 11:40:04 -0500
Subject: [PATCH] fix error about concatenating a nil value

guess the "vs*" config is evaluated even if we aren't building for it...
---
 premake.lua | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/premake.lua b/premake.lua
index 686e5f2..17af0bc 100644
--- a/premake.lua
+++ b/premake.lua
@@ -4,6 +4,8 @@ SDL_ROOT = os.getenv("SDL_ROOT")
 if not SDL_ROOT and string.find(_ACTION, "vs") then
 	printf("ERROR: Environment variable SDL_ROOT is not set.")
 	os.exit()
+elseif not SDL_ROOT then
+	SDL_ROOT = ""
 end
 
 if _ACTION == "clean" then