atftp: enable tests

pkgs/tools/networking/atftp/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, readline, tcp_wrappers, pcre, makeWrapper, gcc }:
+{ lib, stdenv, fetchurl, readline, tcp_wrappers, pcre, makeWrapper, gcc, ps }:
 
 stdenv.mkDerivation rec {
   pname = "atftp";
@@ -9,13 +9,19 @@ stdenv.mkDerivation rec {
     sha256 = "12h3sgkd25j4nfagil2jqyj1n8yxvaawj0cf01742642n57pmj4k";
   };
 
+  # fix test script
+  postPatch = ''
+    patchShebangs .
+  '';
+
   nativeBuildInputs = [ makeWrapper ];
   buildInputs = [ readline tcp_wrappers pcre gcc ];
 
   # Expects pre-GCC5 inline semantics
   NIX_CFLAGS_COMPILE = "-std=gnu89";
 
-  doCheck = false; # fails
+  doCheck = true;
+  checkInputs = [ ps ];
 
   meta = {
     description = "Advanced tftp tools";