Comment 1 for bug 392989

Assuming you are installing in a Mac, I can't reproduce this behavior

$ make install
Installing /Users/gmax/usr/local/lib/perl5/site_perl/5.8.8/MySQL/Sandbox.pm
Installing /Users/gmax/usr/local/lib/perl5/site_perl/5.8.8/MySQL/Sandbox/Recipes.pm
Installing /Users/gmax/usr/local/lib/perl5/site_perl/5.8.8/MySQL/Sandbox/Scripts.pm
Installing /Users/gmax/usr/local/share/man/man3/MySQL::Sandbox.3
Installing /Users/gmax/usr/local/share/man/man3/MySQL::Sandbox::Recipes.3
Installing /Users/gmax/usr/local/share/man/man3/MySQL::Sandbox::Scripts.3
Installing /Users/gmax/usr/local/bin/low_level_make_sandbox
Installing /Users/gmax/usr/local/bin/make_multiple_custom_sandbox
Installing /Users/gmax/usr/local/bin/make_multiple_sandbox
Installing /Users/gmax/usr/local/bin/make_replication_sandbox
Installing /Users/gmax/usr/local/bin/make_sandbox
Installing /Users/gmax/usr/local/bin/make_sandbox_from_installed
Installing /Users/gmax/usr/local/bin/make_sandbox_from_source
Installing /Users/gmax/usr/local/bin/msandbox
Installing /Users/gmax/usr/local/bin/sb
Installing /Users/gmax/usr/local/bin/sbtool
Installing /Users/gmax/usr/local/bin/test_sandbox
Writing /Users/gmax/usr/local/lib/perl5/site_perl/5.8.8/darwin-2level/auto/MySQL/Sandbox/.packlist
Appending installation info to /Users/gmax/usr/local/lib/perl5/5.8.8/darwin-2level/perllocal.pod

Notice that MySQL Sandbox uses the standard Perl installer. I could not find anything related to a wrong path using PREFIX.