after i tar xvzf gama-1.10.tar.gz and change directory,try to install as follow address@hidden:~/survey&mapping/gama/gama-1.10$ ls aclocal.m4 config.h.in COPYING gama-g3 Makefile.am scripts AUTHORS config.log doc gama-local Makefile.in TODO ChangeLog configure Doxyfile INSTALL NEWS xml ChangeLog.1 configure.ac gama.dox lib README address@hidden:~/survey&mapping/gama/gama-1.10$ ./configure checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... configure: error: unsafe absolute working directory name i guess maybe the directory problem,so i tar to another directory,install successful:)and my kernel is address@hidden:~/survey&mapping/gama/gama-1.10$ uname -a Linux 7rack 2.6.35-22-generic #35-Ubuntu SMP Sat Oct 16 20:36:48 UTC 2010 i686 GNU/Linux i am newbie