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For a project at university I need to extend an existing C application, which shall in the end run on a wide variety of commercial and non-commercial unix systems (FreeBSD, Solaris, AIX, etc.).
Which things do I have to consider when I want to write a C program which is most portable?
The best advice I can give, is to move to a different platform every day, testing as you go.
This will make the platform differences stick out like a sore thumb, and teach you the portability issues at the same time.
Saving the cross platform testing for the end, will lead to failure.
That aside
It is generally a good idea to set your compiler warning level up as high as possible,
to see the sorts of things the compiler can complain about.