WEE! Finally it compiled and it runs!
Summary:

The problem was:
Get Apache2 running on Solaris with --with-mpm=perchild

Solution:
1. Add one line into httpd-2.0.43/server/mpm/experimental/perchild/perchild.c at line 59:

#define _XPG4_2 1

2. Comment out line 77 in /usr/include/signal.h
3. Symlink /usr/lib/libiconv.so.2 -> /usr/lib/libm.so

That way I was finally able to compile and start that beast. Now let's just see, how long it will run...

FreeSerf

Finally found a way to press a map made of hexagonals into memory. Have to implement that this evening.