Hi iohannes &c.
I just checked in changes to zexy that enable what I hope is a clean make for MacOSX. I only modified the source files with #ifdefs. I changed one #ifdef from "linux" to "unix" in z_sfrecord.c, so that would be the one place that might require some verification.
Mac folks, try a checkout on externals/zexy, and try to "make -f makefile.darwin".
best regards, adam