From dbbdccdd658169a9f001eff01a7629a2404780ba Mon Sep 17 00:00:00 2001
From: Robin Gloster <mail@glob.in>
Date: Mon, 13 Mar 2017 12:07:48 +0100
Subject: [PATCH] ispc: fix build

---
 pkgs/development/compilers/ispc/default.nix | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/compilers/ispc/default.nix b/pkgs/development/compilers/ispc/default.nix
index 6bc7f66ca299..f8413075ac81 100644
--- a/pkgs/development/compilers/ispc/default.nix
+++ b/pkgs/development/compilers/ispc/default.nix
@@ -1,4 +1,4 @@
-{stdenv, fetchFromGitHub, bash, which, m4, python, bison, flex, llvmPackages, clangWrapSelf,
+{stdenv, fetchFromGitHub, bash, which, m4, python, bison, flex_2_6_1, llvmPackages, clangWrapSelf,
 testedTargets ? ["sse2" "host"] # the default test target is sse4, but that is not supported by all Hydra agents
 }:
 
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
     m4
     python
     bison
-    flex
+    flex_2_6_1
     llvm
     llvmPackages.clang-unwrapped # we need to link against libclang, so we need the unwrapped
   ];