pkgconf (pkg-config), libusb and FreeBSD 9

[Jan Beich]

Lev Serebryakov <lev at FreeBSD.org> writes:

>  I have port, which used libusb-1.0. It uses "pkg-config --cflags
> libusb-1.0" and "pkg-config --libs libusb-1.0".
>
>  For FreeBSD 10 and 11 port works with "USES=pkgconfig". But on
> FreeBSD 9.3 it complains, that "Package libusb-1.0 was not found in
> the pkg-config search path".
>
>  What should I do to make it work on FreeBSD 9?

If the port uses GNU_CONFIGURE try overriding flags:

  # From multimedia/libmtp which has PKG_CHECK_MODULES(LIBUSB, ...)
  .if !exists(/usr/libdata/pkgconfig/libusb-1.0.pc)
  CONFIGURE_ENV+=	LIBUSB_CFLAGS=" " LIBUSB_LIBS="-lusb"
  .endif

Notice this doesn't pass unnecessary (and maybe poisonous)
-I/usr/include -L/usr/lib. With cmake, scons, etc. you may need to
patch the source.

--
There aren't that many libusb consumers to shun doing homework:

  $ git grep -Fl pkgconfig '*/Makefile*' | xargs fgrep -- -lusb
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