/Developer directory doesn't exist, when using new (MAS) versions of Xcode

[spitfire]

As /Developer directory isn't created for new versions of Xcode (especially those compatible with Mountain Lion), ./configure hits the following problem:

checking for library containing backtrace... none required
checking looking for Apple CoreService Framework... checking /Developer/Headers/FlatCarbon/CoreServices.h usability... no
checking /Developer/Headers/FlatCarbon/CoreServices.h presence... no
checking for /Developer/Headers/FlatCarbon/CoreServices.h... no
configure: error: CoreServices.h header file not found

[spitfire]

Following command fixes the problem (with Xcode 4.5 and 10.7 headers installed)
sudo ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk/Developer /Developer