pkgmk work dir on noexec fs

Hi, Today I faced a problem with pkgmk. Building failed with "/bin/sh: bad interpreter: Permission denied". Actually it seems obvious, but maybe it makes sense to add a note regarding that into the CRUX handbook in order to save someone's time. I mean that pkgmk work dir shouldn't be on a filesystem mounted with noexec flag, since most ports use scripts during building process. Regards -- Vitaly Sinilin <vs@kp4.ru>