Unsupported compiler 'com.apple.compilers.llvmgcc42' xcode 5 DP

Question

I have a project which contains Geos and Proj inside it. Before Xcode 5 I compiled them with LLVM GCC 4.2 compiler, but in Xcode 5 DP I get an error about unsupported compiler. Choosing another compiler get to compilation errors depends on syntax. How can I fix this trouble?

Answer 1

A) Stop using Xcode 5

or

B) Fix the errors in your code

I know you won't like that answer but Apple has stated their displeasure for GCC on many occasions and declared it a deprecated technology.