Fixing 8266: How do I get a list of all dist-install/build directories?

Hello everyone, I'm trying to write a patch for #8266. Here's what I have so far: https://gist.github.com/christiaanb/6648192 It changes the name of the dynamic library to a relative path instead of an absolute one. However, now I'm getting an error while building the DPH packages (probably due to the use of TH): Loading package vector-0.9.1 ... <command line>: can't load .so/.DLL for: /Users/christiaan/Documents/devel/ghc/libraries/vector/dist-install/build/libHSvector-0.9.1-ghc7.7.20130918.dylib (dlopen(/Users/christiaan/Documents/devel/ghc/libraries/vector/dist-install/build/libHSvector-0.9.1-ghc7.7.20130918.dylib, 9): Library not loaded: @loader_path/../primitive-0.4.0.1/libHSprimitive-0.4.0.1-ghc7.7.20130918.dylib Referenced from: /Users/christiaan/Documents/devel/ghc/libraries/vector/dist-install/build/libHSvector-0.9.1-ghc7.7.20130918.dylib Reason: image not found) Of course the problem is, is that the packages are not installed yet, so the relative paths don't make sense yet. My solution is to update rules/shell-wrapper.mk, and to add DYLD_FALLBACK_LIBRARY_PATH = to the inplace/bin shell wrappers. So that during building of ghc, dynlibs of all the packages can still be resolved to the place where they were build. So my question is: how do I get the list within the build system? Cheers, Christiaan