OK, I installed Subversion and got the latest libiec61883 code, but I still can't run autoconf (or autoreconf, as Pieter suggested). The output I get looks like this: [root@localhost libiec61883]# autoreconf -f -i -s Can't locate File/stat.pm in @INC (@INC contains: /usr/share/autoconf /usr/lib/perl5/5.8.8/i386-linux /usr/lib/perl5/5.8.8 /usr/lib/perl5/site_perl/5.8.8/i386-linux /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl/5.8.6 /usr/lib/perl5/site_perl/5.8.5 /usr/lib/perl5/site_perl/5.8.4 /usr/lib/perl5/site_perl/5.8.3 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.8.8/i386-linux /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl/5.8.6 /usr/lib/perl5/vendor_perl/5.8.5 /usr/lib/perl5/vendor_perl/5.8.4 /usr/lib/perl5/vendor_perl/5.8.3 /usr/lib/perl5/vendor_perl .) at /usr/share/autoconf/Autom4te/FileUtils.pm line 36. BEGIN failed--compilation aborted at /usr/share/autoconf/Autom4te/FileUtils.pm line 36. Compilation failed in require at /usr/bin/autoreconf line 45. BEGIN failed--compilation aborted at /usr/bin/autoreconf line 45. So I locate stat.pm: [root@localhost libiec61883]# locate stat.pm /usr/local/lib/perl5/5.8.8/File/stat.pm /usr/src/perl-5.8.8/lib/File/stat.pm /usr/lib/perl5/5.8.6/File/stat.pm Sure enough, none of those paths are in the @INC array. Can anyone tell me how to add paths to the @INC environment variable? Thanks, Steve