How to change compiler settings for one particular file ?

I need to compile a source file with different compiler settings as the other files of the project, how to ?
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How to link to a dylib ?

I have a problem linking my project to a dylib of my own: the dylib is correctly installed in the search path and I have the correct -lMyLib flag set in the linker option, but the linker always report an "Undefined symbol: xxx". What can be wrong?
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Yacc files compiling with Xcode and native targets is broken...

Is there a workaround ?
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How to change "__MyCompanyName__" ?

Where does ProjectBuilder (Xcode) stores the string to use as "__MyCompanyName__" ?
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How to solve the "Cocoa/Cocoa.h" not found problem?

When downloading example projects from some site I got an error at the compiling of the precompiled header, where the compiler complains about system frameworks not to be there ?
Why and how to solve ?
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