PERL_RUN_DEPENDS and PERL_BUILD_DEPENDS

[Sergey Skvortsov]

Edwin Groothuis wrote:
>>> The syntax is:
>>>    PERL_BUILD_DEPENDS=	MIME-Lite:${PORTSDIR}/mail/p5-MIME-Lite
>>> It checks the for the existence of MIME::Lite with the "perl -e
>>> 'use MIME::Lite'" command.
>> Obviously this approach will cause great performance degrade.
>> stat(2) is much more faster than loading perl.
> 
> Minimal compared with the time it takes to fetch distfiles and to
> build. That's the only time it is checked.

Loading some module (via "use") can take even more time than simply 
detecting corresponding .pm file because all code is compiled into 
bytecode-tree. PERL_BUILD_DEPEND is an useless syntax sugar.

FYI: "perl -MMIME::Lite -e 0" is right way to check module.

-- 
Sergey Skvortsov
mailto: skv at protey.ru