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After upgrading xcode locally (which required upgrading to macOS 10.14.6, and upgrading command line tools with xcode-select --install), I was able to build all targets of libmongoc without issue.
clang --version reports
Apple clang version 11.0.0 (clang-1100.0.33.12)
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Target: x86_64-apple-darwin18.7.0
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Thread model: posix
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InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
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And configuring confirms that it is using that compiler [cmake] The C compiler identification is ;AppleClang 11.0.0.11000033.
Closing as I cannot reproduce.
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