in reply to Installing Zlib-1.34
Which C-compiler did your sysadmin install?.. The Solaris one or GCC?
If you do a "which cc", can it find your compiler?...
If not, you might want to do the following:
find /usr -name cc
.. and whatever directory it finds that in, if it finds it, add that to your PATH environment variable.
I bet after you do that this will work.