Naming convention package <P> and <P>-devel

[Mayuresh <mayuresh%acm.org@localhost>]

For some packages the pkgsrc tree contains a directory with suffix -devel.

For example mutt-devel for mutt.

Wonder what this naming convention is about.

Also -devel looks more up-to-date in terms of features etc. Then why not
just call it with its base and drop suffix -devel?

I come from prior Linux background where -devel indicates a package that
just provides header files etc of its corresponding binary package for
development purpose.

Mayuresh.