I got zlib-1.2.3 source from the zlib Home Site, and built it (also in the MSYS shell) by running:

./configure
make
make check
make install

It should then be straightforward to build and install io_lib-1.11.6.1 as per the instructions in my earlier post.

Cheers,
Rob

In reply to Re^3: Bioperl-ext problem: Can't install staden io_lib on windows XP by syphilis
in thread Bioperl-ext problem: Can't install staden io_lib on windows XP by bilogical

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