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#!/usr/bin/perl -w
use CGI ':standard';
use Mail::Sendmail;

$ perl -c test.cgi

# it gives

test.cgi syntax OK

$ perl -cT test.cgi

It gives:
Can't locate Mail/Sendmail.pm in @INC (@INC contains: ~/lib/perl5/site
+_perl/5.8.5/ /usr/lib/perl5/5.8.5/i386-linux-thread-multi /usr/lib/pe
+rl5/5.8.5 /usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi /usr
+/lib/perl5/site_perl/5.8.4/i386-linux-thread-multi /usr/lib/perl5/sit
+e_perl/5.8.3/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.2/i
+386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.1/i386-linux-thre
+ad-multi /usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi /usr/
+lib/perl5/site_perl/5.8.5 /usr/lib/perl5/site_perl/5.8.4 /usr/lib/per
+l5/site_perl/5.8.3 /usr/lib/perl5/site_perl/5.8.2 /usr/lib/perl5/site
+_perl/5.8.1 /usr/lib/perl5/site_perl/5.8.0 /usr/lib/perl5/site_perl /
+usr/lib/perl5/vendor_perl/5.8.5/i386-linux-thread-multi /usr/lib/perl
+5/vendor_perl/5.8.4/i386-linux-thread-multi /usr/lib/perl5/vendor_per
+l/5.8.3/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.2/i386
+-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.1/i386-linux-threa
+d-multi /usr/lib/perl5/vendor_perl/5.8.0/i386-linux-thread-multi /usr
+/lib/perl5/vendor_perl/5.8.5 /usr/lib/perl5/vendor_perl/5.8.4 /usr/li
+b/perl5/vendor_perl/5.8.3 /usr/lib/perl5/vendor_perl/5.8.2 /usr/lib/p
+erl5/vendor_perl/5.8.1 /usr/lib/perl5/vendor_perl/5.8.0 /usr/lib/perl
+5/vendor_perl) at temp.cgi line 4.
BEGIN failed--compilation aborted at temp.cgi line 4.

#!/usr/bin/perl -w
use CGI ':standard';
use lib "/lib/perl5/site_perl/5.8.5/";
use lib "/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi";
use Mail::Sendmail;