Going by the error message, the current version of the module is trying to call a function that hasn't been defined; looking through the module source, I can tell you it ain't in that module.

Further research suggests that bootstrap is a function defined in the DynaLoader module, which appears in the @ISA array of the Crypt::DES module as it is built, but the DynaLoader module isn't loaded via use or require in Crypt::DES source that gets built.

Perhaps the author of Crypt::DES forgot a require DynaLoader line, which, according to my system's documentation for that module, is required.

(I added the requisite line to my Crypt::DES source, and it works -- mail has also been sent to the module's maintainer.)

Philosophy can be made out of anything. Or less -- Jerry A. Fodor