Dear Nickolay Skorochodov,

how you have to compile `unzoo.c' depends on what machine you are
using. If you look at the file `unzoo.c' you will find a section with
compilation hints under the heading `COMPILATION'. It describes
precisely what command you have to enter for which machine. If your
machine is not among the options listed there (and if -DSYS_IS_GENERIC
does not work either), do not hesitate to ask
`Gap-Trouble@math.rwth-aachen.de' again, stating

* what machine
* what operating system
* what C compiler

you are using.

Hope this helps,

Heiko Thei{\ss}en