From b0327ac2409f9d7e9a5aa0379f2b351b56058dfd Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Thu, 1 Sep 2016 15:09:28 +0200
Subject: [PATCH] tcl: Separate man output and use symlinks

This reduces tcl's total size from 25.0 MiB to 8.6 MiB. Admittedly
this is also because putting the manpages in the right place causes
all man3 pages to be deleted by the multiple outputs setup hook. Not
sure if that's desirable behaviour...
---
 pkgs/development/interpreters/tcl/generic.nix | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/interpreters/tcl/generic.nix b/pkgs/development/interpreters/tcl/generic.nix
index d01df5ce8be8..eafffba4a34f 100644
--- a/pkgs/development/interpreters/tcl/generic.nix
+++ b/pkgs/development/interpreters/tcl/generic.nix
@@ -10,15 +10,23 @@ stdenv.mkDerivation rec {
 
   inherit src;
 
+  outputs = [ "out" "man" ];
+
+  setOutputFlags = false;
+
   preConfigure = ''
+    # Note: using $out instead of $man to prevent a runtime dependency on $man.
+    configureFlagsArray+=(--mandir=$out/share/man --enable-man-symlinks)
     cd unix
   '';
 
+  enableParallelBuilding = true;
+
   postInstall = ''
     make install-private-headers
     ln -s $out/bin/tclsh${release} $out/bin/tclsh
   '';
-  
+
   meta = with stdenv.lib; {
     description = "The Tcl scription language";
     homepage = http://www.tcl.tk/;
@@ -26,7 +34,7 @@ stdenv.mkDerivation rec {
     platforms = platforms.all;
     maintainers = with maintainers; [ wkennington vrthra ];
   };
-  
+
   passthru = rec {
     inherit release version;
     libPrefix = "tcl${release}";