setlocal
    PATH=c:\path\to\locallib\bin;%PATH%             &rem PATH=%~do0locallib\bin;%PATH%           &rem ... the second works in a .bat/.cmd
    set PERL5LIB=C:\path\to\locallib\lib\perl5      &rem set PERL5LIB=%~dp0locallib\lib\perl5    &rem ... the second works in a .bat/.cmd
    pp -x -o out.exe in.pl                          &rem see longer version, below