Dear Frantisek,
> compiler v1.9 (http://www.openwatcom.org/) for DOS. And there I knock
> to problem - it seems as this compiler not support construction:
>
> int main(int argc, char *argv[], char *envp[])

I think this 3rd argument may be a MS-specific extension, as most C 
programs just have argc & argv in the call to main();

If you change to use the 'environ' variable, that should be pre-defined 
(probably in stdlib.h) and should do the same job. Attached is an 
example that seems to compile & work under C6 DOS compiler and with gcc 
on my Ubuntu 10.04 box.

Regards,
Paul