diff --git a/pkgs/development/libraries/isl/default.nix b/pkgs/development/libraries/isl/default.nix
index 931ee831b73..5fa009277e1 100644
--- a/pkgs/development/libraries/isl/default.nix
+++ b/pkgs/development/libraries/isl/default.nix
@@ -1,18 +1,19 @@
 { stdenv, fetchurl, gmp }:
 
 stdenv.mkDerivation rec {
-  name = "isl-0.11.1"; # CLooG 0.16.3 fails to build with ISL 0.08.
+  name = "isl-0.14";
 
   src = fetchurl {
-    url = "http://pkgs.fedoraproject.org/repo/pkgs/gcc/isl-0.11.1.tar.bz2/bce1586384d8635a76d2f017fb067cd2/isl-0.11.1.tar.bz2";
-    sha256 = "13d9cqa5rzhbjq0xf0b2dyxag7pqa72xj9dhsa03m8ccr1a4npq9";
+    url = "http://isl.gforge.inria.fr/${name}.tar.bz2";
+    sha256 = "0dlg4b85nw4w534525h0fvb7yhb8i4am8kskhmm0ym7qabzh4g3y";
   };
 
   buildInputs = [ gmp ];
-  patches = [ ./fix-gcc-build.diff ];
 
   enableParallelBuilding = true;
 
+  doCheck = true;
+
   meta = {
     homepage = http://www.kotnet.org/~skimo/isl/;
     license = stdenv.lib.licenses.lgpl21;
diff --git a/pkgs/development/libraries/isl/fix-gcc-build.diff b/pkgs/development/libraries/isl/fix-gcc-build.diff
deleted file mode 100644
index 6fbd1f9d478..00000000000
--- a/pkgs/development/libraries/isl/fix-gcc-build.diff
+++ /dev/null
@@ -1,12 +0,0 @@
-diff -ru isl-0.11.1/include/isl/int.h isl-0.11.1.new/include/isl/int.h
---- isl-0.11.1/include/isl/int.h        2012-11-29 09:47:32.000000000 +0100
-+++ isl-0.11.1.new/include/isl/int.h    2013-10-27 15:35:31.348553812 +0100
-@@ -14,7 +14,7 @@
- #include <string.h>
- #include <gmp.h>
- #if defined(__cplusplus)
--#include <iostream>
-+#include <ostream>
- #endif
- 
- #if defined(__cplusplus)