mindcooler

Don't try to include the headers blackpage mentioned, they're all wrong. For std::cerr, std::endl etc you include <iostream> (no .h). But it seems to me that you are not just missing some includes, you seem to be missing to link c+++ as c++ code. If you want further help, post a complete, compilable, but smallest possible example that exhibits your problem.

Well, you are trying to build C++ so you should replace gcc with g++. So, replace $ gcc -g -O2 -v -Q -Wall -o lheed /home/lenja/adsdb_8_2/lib/redhat61/lheed.so -I/home/lenja/adsdb_8_2/inc lheed_a2ia.c with: $ g++ -g -O2 -v -Q -Wall -o lheed /home/lenja/adsdb_8_2/lib/redhat61/lheed.so -I/home/lenja/adsdb_8_2/inc lheed_a2ia.c One other thing, you are running an ancient version of gcc (and what appears to be an ancient version of redhat), you should really consider upgrading to something more recent (and usable). / mindcooler