Hello all! Today I have tried building Haiku on CentOS. when I was building the cross compiling tools, I met an error, which is caused by missing zlib.h header. I have googled and found that we have to install zlib-devel. I think we should add zlib-devel to the pre-requested software list used by RPM linux releases. this will give some help. Best Regards! --kurain -- 淡泊明志,宁静致远。