I tried to compile HTK using Ubuntu 10.04. The tutorial says that I only could do this using gcc 3.4. But there is no gcc 3.4 for Ubuntu 10.04, and in the HTK site, it is written that I could use gcc 4 with the newest version of HTK source code. The "configure" was ok, but not "make all". I seek for the problem and has found this website, http://www.linuxidc.com/Linux/2009-12/23132.htm, in which uses the "sudo apt-get install libc6-dev g++ gccsudo" "apt-get install libx11-dev" to install some libraries. Now, everything works well!