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$ perl -le " use if $ENV{maplat_debug}, lib => 666; print for @INC" C:/perl/site/5.12.2/lib/MSWin32-x86-multi-thread ... C:/perl/5.12.2/lib/MSWin32-x86-multi-thread C:/perl/5.12.2/lib .
use if Log::Log4perl->get_logger->is_debug, ...; ... my_program.pl --debug MyModule my_program.pl --debug MyModule,MyOtherModule --debug Foo