diff --git a/pkgs/development/libraries/libunistring/clang.patch b/pkgs/development/libraries/libunistring/clang.patch
deleted file mode 100644
index fdcbc0d528d0..000000000000
--- a/pkgs/development/libraries/libunistring/clang.patch
+++ /dev/null
@@ -1,14 +0,0 @@
-diff --git a/lib/stdint.in.h b/lib/stdint.in.h
-index 997e406..e0827f5 100644
---- a/lib/stdint.in.h
-+++ b/lib/stdint.in.h
-@@ -53,7 +53,8 @@
-      in <inttypes.h> would reinclude us, skipping our contents because
-      _GL_STDINT_H is defined.
-      The include_next requires a split double-inclusion guard.  */
--# @INCLUDE_NEXT@ @NEXT_STDINT_H@
-+# include <inttypes.h>
-+// # @INCLUDE_NEXT@ @NEXT_STDINT_H@
- #endif
- 
- #if ! defined _GL_STDINT_H && ! defined _GL_JUST_INCLUDE_SYSTEM_STDINT_H
diff --git a/pkgs/development/libraries/libunistring/default.nix b/pkgs/development/libraries/libunistring/default.nix
index 0cf770af910f..e1b8c04b4ce5 100644
--- a/pkgs/development/libraries/libunistring/default.nix
+++ b/pkgs/development/libraries/libunistring/default.nix
@@ -9,21 +9,17 @@ stdenv.mkDerivation rec {
     sha256 = "1x9wnpzg7vxyjpnzab6vw0afbcijfbd57qrrkqrppynh0nyz54mp";
   };
 
-  patches = stdenv.lib.optionals stdenv.isDarwin [ ./clang.patch stdenv.secure-format-patch ];
-
   outputs = [ "out" "dev" "info" "doc" ];
 
   propagatedBuildInputs = stdenv.lib.optional (!stdenv.isLinux) libiconv;
 
-  enableParallelBuilding = false;
-
   configureFlags = [
     "--with-libiconv-prefix=${libiconv}"
   ];
 
-  # XXX: There are test failures on non-GNU systems, see
-  # http://lists.gnu.org/archive/html/bug-libunistring/2010-02/msg00004.html .
-  doCheck = (stdenv ? glibc) && (stdenv.hostPlatform == stdenv.buildPlatform);
+  doCheck = true;
+
+  enableParallelBuilding = true;
 
   meta = {
     homepage = http://www.gnu.org/software/libunistring/;