On my Mac, the default ./configure line uses bundled Snappy and generates libmongoc-static-1.0-config.cmake with these libraries:

-lsasl2 -lz libsnappy.la

I think the syntax is wrong. Also, libsnappy.la is not installed by "make install". Building libmongoc with the Autotools and then linking a program to libmongoc using the CMake configuration file fails:

> BUILD_SAMPLE_WITH_CMAKE=1 BUILD_LIBMONGOC_WITH_CMAKE=  LINK_STATIC=1 sh .evergreen/link-sample-program.sh
...
ld: library not found for -llibsnappy.la

Same for building libmongoc with CMake.

Linking a program to the libmongoc shared lib seems to work fine.