curlftpfs: add darwin build

pkgs/tools/filesystems/curlftpfs/default.nix

···
-{lib, stdenv, fetchurl, fuse, curl, pkg-config, glib, zlib}:
+{ lib, stdenv, fetchurl, autoreconfHook, fuse, curl, pkg-config, glib, zlib }:
 
 stdenv.mkDerivation {
   name = "curlftpfs-0.9.2";
···
     url = "mirror://sourceforge/curlftpfs/curlftpfs-0.9.2.tar.gz";
     sha256 = "0n397hmv21jsr1j7zx3m21i7ryscdhkdsyqpvvns12q7qwwlgd2f";
   };
-  nativeBuildInputs = [ pkg-config ];
-  buildInputs = [fuse curl glib zlib];
+  nativeBuildInputs = [ autoreconfHook pkg-config ];
+  buildInputs = [ fuse curl glib zlib ];
+
+  CFLAGS = lib.optionalString stdenv.isDarwin "-D__off_t=off_t";
+
+  postPatch = lib.optionalString stdenv.isDarwin ''
+    # Fix the build on macOS with macFUSE installed. Needs autoreconfHook for
+    # this change to effect
+    substituteInPlace configure.ac --replace \
+      'export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig:$PKG_CONFIG_PATH' \
+      ""
+  '';
 
   doCheck = false; # fails, doesn't work well too, btw
 
···
     description = "Filesystem for accessing FTP hosts based on FUSE and libcurl";
     homepage = "http://curlftpfs.sourceforge.net";
     license = licenses.gpl2;
-    platforms = platforms.linux;
-
+    platforms = platforms.unix;
   };
 }