> Does /nix/store/*-usbutils/lib/pkgconfig/usbutils.pc exist?  If it does,
> is it version >= 0.82?

There is no 'lib' at all.

> What’s the value of PKG_CONFIG_PATH in the ‘environment-variables’ file
> of the build tree of the udev?

export PKG_CONFIG_PATH="/nix/store/1qbbjlk4y0x4284rslawk6mxn93wvdba-util-linux-2.21/lib/pkgconfig:/nix/store/qwd8kh9mkpq3jmn92yhcw95d9c26azv2-kmod-12/lib/pkgconfig:/nix/store/1x3fy2fs9p4k80asqcasji82lhhfb5hp-libusb-1.0.9/lib/pkgconfig:/nix/store/5z1yxm70zcsgkmdshg8xg8gpzkpwg48c-xz-5.0.4/lib/pkgconfig"

Nikita