Thanks. I've now got it working. I pointed the shebang line in the CGI script to the perlbrew perl (I'll probably change that to a symlink as you suggest at the next go-around). Then I assigned to $ENV{PERLBREW_ROOT} and $ENV{PERLBREW_HOME} in the CGI script before running an application. All the applications have !#/usr/bin/env perl shebangs in the usual way and that seems to work. Thanks for the reassurance about the libraries.