ledger3: On darwin, change boost lib paths to absolute references

pkgs/applications/office/ledger/3.0.nix

@@ -23,6 +23,11 @@ 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 $out/lib/''$boostlib $out/bin/ledger
+    done
   '';
 
   meta = {