I run Perl/Tk or WWW::Mechanize just fine using terminal but when I try to invoke the interpreter through Emacs shell (M-!), it dies with a message: Can't locate tk.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.12.4 /usr/local/share/perl/5.12.4 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.12 /usr/share/perl/5.12 /usr/local/lib/site_perl .) at perl-tk.pl line 2. Obviously, this array @INC doesn't hold the path to my modules, the question is, how can I do that? I didn't find anything on emacs manual. I also googled it but to no avail.