Marcello wrote: > checking for lex... no > configure: error: *** Unable to locate lex. ... > P.S. I use Ubuntu 9.10 64 bits. you need to install all the "Build-depends" packages listed here: http://svn.debian.org/viewsvn/pkg-grass/packages/grass/trunk/debian/control ( http://grass.osgeo.org/wiki/Compile_and_Install_Ubuntu#Dependencies ) Hamish