[Interest] qt mac buildkey and pkg-config

[Justin Karneges]

Hi,

I noticed that the buildkey of the official Qt Mac binary package is:
  "macosx macx-cocoa g++-4 full-config"

However, when I built Qt Mac from source, I ended up with:
  "macosx macx-cocoa g++-4 no-pkg-config"

Two questions:

1) Why would the existence of pkg-config during build have anything to do with 
plugin compatibility? I feel like this shouldn't affect the build key.

2) What is the proper way to satisfy the pkg-config condition needed to produce 
the same buildkey as the official binary without any unintended side-effects? I'd 
very much like to be able to produce code that is compatible with the binary. 
The only reason I build my own Qt is for universal binary support.

What I've done for now is make a "fake" /usr/bin/pkg-config that simply exits 
with a return code of 1. This seems to be enough to satisfy Qt (after running 
configure, I can see the buildkey now looks the same as the official Qt binary), 
hopefully without introducing any side effects (whereas a "real" pkg-config 
might drag in new flags/libs).

Justin