To speed the build process, avoid possible name clashes etc.,
one #includes only necessary header files.
However, once you need <windows.h>, it opens the floodgates.

To exclude rarely-used Windows header files, I added

    #define WIN32_LEAN_AND_MEAN 1

to implement.h, pthread.h and various test files - see

    <http://support.microsoft.com/default.aspx?scid=kb;en-us;166474>

for details.
Now, we have to be explicit if we need additional Windows header
files, e.g. <winsock.h> in cancel9.c.
Similar for <stdlib.h>.


Steffen Goeldner