This is a confusing way to handle the naming:

>  DISTNAME =	ghostscript-${VERSION}
> +DISTFILES =	ghostpdl-${VERSION}${EXTRACT_SUFX}
...
> +WRKDIST =	${WRKDIR}/ghostpdl-${VERSION}

- it would be simpler like this:

DISTNAME =	ghostpdl-${VERSION}
PKGNAME =	ghostscript-${VERSION}