@Viveka_BC, as I suspected, you have an installation of the C driver and libmongocrypt under /usr/local. The pkg-config files are being found there (at lines 7-11 of the output you provided). You should either remove the C driver and libmongocrypt installations located under /usr/local or remove the distribution packages you installed. It is best to only have one or the other present on your system in order to avoid issues like what you have encountered.
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