Split libcap package

libcap can be splitted for free (just cd subdir; make install).
So I've decided not to raise up disscussions "should we build cap_pam.so?" etc.

svn path=/nixpkgs/branches/stdenv-updates/; revision=23967

pkgs/os-specific/linux/libcap/default.nix

@@ -1,17 +1,29 @@
-{stdenv, fetchurl, attr, perl, pam}:
+{stdenv, fetchurl, attr, perl}:
 
 assert stdenv.isLinux;
 
-stdenv.mkDerivation {
-  name = "libcap-2.19";
+stdenv.mkDerivation rec {
+  name = "libcap-${version}";
+  version = "2.19";
   
   src = fetchurl {
-    url = mirror://kernel/linux/libs/security/linux-privs/kernel-2.6/libcap-2.19.tar.gz;
+    url = "mirror://kernel/linux/libs/security/linux-privs/kernel-2.6/${name}.tar.gz";
     sha256 = "0fdsz9j741npvh222f8p1y6l516z9liibiwdpdr3a4zg53m0pw45";
   };
   
   buildNativeInputs = [perl];
-  buildInputs = [attr pam];
+  propagatedBuildInputs = [attr];
 
-  makeFlags = "PAM_CAP=yes lib=lib prefix=$(out)";
+  preConfigure = "cd libcap";
+
+  makeFlags = "lib=lib prefix=$(out)";
+
+  passthru = {
+    postinst = n : ''
+      ensureDir $out/share/doc/${n}
+      cp ../License $out/share/doc/${n}/License
+    '';
+  };
+
+  postInstall = passthru.postinst name;
 }