Updated toolchain.lua.

scripts/toolchain.lua

@@ -122,7 +122,7 @@ function toolchain(_buildDir, _libDir)
 		tvosPlatform = _OPTIONS["with-tvos"]
 	end
 
-	if _ACTION == "gmake" then
+	if _ACTION == "gmake" or _ACTION == "ninja" then
 
 		if nil == _OPTIONS["gcc"] then
 			print("GCC flavor must be specified!")