[Bug 261891] [NEW PORT] graphics/epsonscan2: scanner engine supporting many Seiko/Epson scanners

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261891

--- Comment #26 from Tatsuki Makino <tatsuki_makino@hotmail.com> ---
(In reply to J.R. Oldroyd from comment #24)

for graphics/epsonscan2-non-free-plugin:

I think it's better to use epsonscan2-bundle instead of
epsonscan2-non-free-plugin for the PORTNAME to avoid problems later.

When using linux compatibility, use USES=linux instead of *_DEPENDS=.
When other required libraries that are defined in /usr/ports/Mk/Uses/linux.mk
are used, use USE_LINUX=. However, this is not the case for linux_libusb.

${ARCH} and some variables are defined after .include <bsd.port.options.mk> or
.include <bsd.port.pre.mk>.
For example:
PORTNAME= epsonscan2...
.include <bsd.port.options.mk>
.if ${ARCH} == amd64
FOR_AMD64_FOOBAR= foo
.endif
.include <bsd.port.mk>

For the post-extract target, in the case of porting
epson-inkjet-printer-escpr2, I copied the commands for the do-extract target in
/usr/ports/Mk/bsd.port.mk.
I don't think it's necessary to delete files scattered around WRKDIR here,
unless there are duplicate names.
For the do-install target, I also copied the one in
/usr/ports/Mk/Uses/linux.mk.
I think it's easier to see what will happen that way.

If poudriere, etc. are stopped by a license that is not automatically accepted,
put the following in /usr/local/etc/poudriere.d/make.conf and it will go
through everything :)

LICENSES_ACCEPTED= ${LICENSE}

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