Here's what happens when you use() your mymodule.pm the first time. The file mymodule.pm is located and compiled. You didn't declare a new package so everything is loaded into your current package. Then mymodule->import() is attempted. That doesn't exist so nothing happens. Your next module use()'s mymodule. Now only mymodule->import() is called. This is how you tell perl that this file has things to export. When you don't use packages and Exporter then perl will assume it's already compiled the thing and not bother trying again.

Here are some workarounds:

• use do() instead and name the file specifically. That'll run regardless of whether perl has seen it before or not.
• Remove the mymodule.pm entry in %INC in a BEGIN block just prior to use()ing it. BEGIN { delete $INC{'mymodule.pm'} }
• Add the code I said you were missing. It can't be helped, really.

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