Revert "pythonPackages.pyev: drop"

Package is still referred to.

This reverts commit bb5c039fc9.

pkgs/development/python-modules/pyev/default.nix

@@ -0,0 +1,30 @@
+{ stdenv, fetchurl, buildPythonPackage, libev }:
+
+buildPythonPackage rec {
+  pname = "pyev";
+  version = "0.9.0";
+
+  src = fetchurl {
+    url = "mirror://pypi/p/pyev/${pname}-${version}.tar.gz";
+    sha256 = "0rf603lc0s6zpa1nb25vhd8g4y337wg2wyz56i0agsdh7jchl0sx";
+  };
+
+  buildInputs = [ libev ];
+
+  libEvSharedLibrary =
+    if !stdenv.isDarwin
+    then "${libev}/lib/libev.so.4"
+    else "${libev}/lib/libev.4.dylib";
+
+  postPatch = ''
+    test -f "${libEvSharedLibrary}" || { echo "ERROR: File ${libEvSharedLibrary} does not exist, please fix nix expression for pyev"; exit 1; }
+    sed -i -e "s|libev_dll_name = find_library(\"ev\")|libev_dll_name = \"${libEvSharedLibrary}\"|" setup.py
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Python bindings for libev";
+    homepage = https://code.google.com/p/pyev/;
+    license = licenses.gpl3;
+    maintainers = [ maintainers.bjornfor ];
+  };
+}

pkgs/top-level/python-packages.nix

@@ -4370,6 +4370,8 @@ in {
 
   pyenchant = callPackage ../development/python-modules/pyenchant { };
 
+  pyev = callPackage ../development/python-modules/pyev { };
+
   pyexcelerator = callPackage ../development/python-modules/pyexcelerator { };
 
   pyext = callPackage ../development/python-modules/pyext { };