Makefile: use pkg-config to detect libusb on macOS #197
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Makefile: use pkg-config to detect libusb on macOS
Some versions of librtlsdr (including the version installed by Homebrew
bottle) wrongly declare -lusb-1.0 in its pkg-config file's Libs section.
On Apple Silicon Macs, Homebrew installs libusb dylibs in /opt/homebrew/lib,
which is not a known path for linkers and causes build failure. Some people
reported this linker problem in #166, #181. This should fix it.
For the redundant -lusb-1.0 problem, also see:
https://gitea.osmocom.org/sdr/rtl-sdr/commit/222517b506278178ab93182d79ccf7eb04d107ce