pkgconf (pkg-config), libusb and FreeBSD 9

[Lev Serebryakov]

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 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?

- -- 
// Lev Serebryakov
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