Only check portability of the `set_prolog_flag/2` directive when used within entities
Only check portability of the `set_prolog_flag/2` directive when used within entities

LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3