cygwin: findutils fpending and coreutils patch

pkgs/tools/misc/coreutils/default.nix

@@ -1,6 +1,7 @@
 { stdenv, fetchurl, perl, gmp ? null
 , aclSupport ? false, acl ? null
 , selinuxSupport? false, libselinux ? null, libsepol ? null
+, autoconf, automake114x
 }:
 
 assert aclSupport -> acl != null;
@@ -18,6 +19,8 @@ let
       sha256 = "0bdq6yggyl7nkc2pbl6pxhhyx15nyqhz3ds6rfn448n6rxdwlhzc";
     };
 
+    patches = if stdenv.isCygwin then [ ./coreutils-8.23-4.cygwin.patch ] else null;
+
     # The test tends to fail on btrfs and maybe other unusual filesystems.
     postPatch = stdenv.lib.optionalString (!stdenv.isDarwin) ''
       sed '2i echo Skipping dd sparse test && exit 0' -i ./tests/dd/sparse.sh
@@ -26,6 +29,7 @@ let
     nativeBuildInputs = [ perl ];
     buildInputs = [ gmp ]
       ++ optional aclSupport acl
+      ++ optionals stdenv.isCygwin [ autoconf automake114x ]   # due to patch
       ++ optionals selinuxSupport [ libselinux libsepol ];
 
     crossAttrs = {

pkgs/tools/misc/findutils/default.nix

@@ -19,6 +19,10 @@ stdenv.mkDerivation rec {
     configureFlags = [ "gl_cv_func_wcwidth_works=yes" ];
   };
 
+  preConfigure = if stdenv.isCygwin then ''
+    sed -i gnulib/lib/fpending.h -e '/include <stdio_ext.h>/d'
+  '' else null;
+
   meta = {
     homepage = http://www.gnu.org/software/findutils/;
     description = "GNU Find Utilities, the basic directory searching utilities of the GNU operating system";