I am going to commit the following to HEAD. From feedback I had it should at
least fix reported compile problem. Of course, it does not mean that
compiled zsh will run, but that patch is needed in any case.

Note, that it adds test for type of third argument to accept (that is used
in some other functions as well). It currently checks for size_t, unsigned
long and int (those I have on systems here and reported on AIX 4.x) and
works on ReliantUNIX, Cygwin (up to date net release) and Mandrake with
gcc-2.96/glibc-2.2.3. Feel free to add more types as needed for your system.

-andrej