use lib "MyTest MyModules";   # wrong - a string!

##</code><code>##

use lib qw(MyTest MyModules); # correct - a list.

##</code><code>##

use lib "/home/.../MyTest /home/.../MyModules"

##</code><code>##

qwurx [shmem] > perl -le 'use lib "MyTest MyModules"; print for @INC'
MyTest MyModules
/home/shmem/perl/lib
/usr/lib/perl5/5.8.8/i586-linux-thread-multi
/usr/lib/perl5/5.8.8
/usr/lib/perl5/site_perl/5.8.8/i586-linux-thread-multi
/usr/lib/perl5/site_perl/5.8.8
/usr/lib/perl5/site_perl
/usr/lib/perl5/vendor_perl/5.8.8/i586-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.8.8
/usr/lib/perl5/vendor_perl