Problems with shared library

[Schultis Abt.013.2]

I've tried to build a shared library and found a serious problem
and now I need some help.
Has anyone created their own shared library containing lots of
references to system type C-functions,
e.g. how can FILE *popen() be linked to the target file so that
all references are covered?

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          Gerhard Schultis                 shu at kivax.uucp
          Mannesmann Kienzle GmbH
          7730 VS-Villingen  -Germany