From d808f98fd3de15bf23e1a1b3fe8594e48e630f2f Mon Sep 17 00:00:00 2001
From: Danila Fedorin <danila.fedorin@gmail.com>
Date: Sat, 18 Mar 2017 17:36:13 -0700
Subject: [PATCH] Add code to return early in CMakeLists to prevent being
 included again.

---
 CMakeLists.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f5bd0d9..9ba01f1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,9 @@
 cmake_minimum_required(VERSION 2.7)
+
+if(TARGET lex)
+  return()
+endif(TARGET lex)
+
 project(liblex)
 
 add_library(lex STATIC src/pattern.c src/pairmap.c src/eval.c)