The "-r" option is highly discouraged in BSD although it's reluctantly
supported. The problem is that it doesn't behave the same on all
platforms. For example, "cp -r pts-core/ destdir/" won't always give
the same results:
On NetBSD, pts-core files are put: /destdir/pts-core/<files>
On DragonFly pts-core files are put: /destdir/<files>
That messes the PLIST up.
This changes "cp -r <dir>/" to "cp -R <dir>" which has the same
behavior on different platforms. Tested on NetBSD and DragonFly
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