boost: correct the install names for darwin

This also makes the recent change for ledger unnecessary.

pkgs/applications/office/ledger/3.0.nix

@@ -23,11 +23,6 @@ stdenv.mkDerivation {
   postInstall = ''
     mkdir -p $out/share/emacs/site-lisp/
     cp -v "$src/lisp/"*.el $out/share/emacs/site-lisp/
-  '' + stdenv.lib.optionalString stdenv.isDarwin ''
-    for i in date_time filesystem system iostreams regex unit_test_framework; do
-      boostlib=libboost_''$i.dylib
-      install_name_tool -change ''$boostlib ${boost}/lib/''$boostlib $out/bin/ledger
-    done
   '';
 
   meta = {

pkgs/development/libraries/boost/generic.nix

@@ -118,8 +118,13 @@ stdenv.mkDerivation {
 
   preConfigure = ''
     NIX_LDFLAGS="$(echo $NIX_LDFLAGS | sed "s,$out,$lib,g")"
+    substituteInPlace tools/build/src/tools/clang-darwin.jam \
+      --replace '$(<[1]:D=)' "$lib/lib/\$(<[1]:D=)"
   '';
 
+  NIX_CFLAGS_LINK = stdenv.lib.optionalString stdenv.isDarwin
+                      "-headerpad_max_install_names";
+
   enableParallelBuilding = true;
 
   buildInputs = [ icu expat zlib bzip2 python ]