This issue appears to be impacting not only the GRPC Ruby Gem, but also the grpcio Python package.

I'm able to consistently repro the following on Mac OS X Catalina (10.15.7) when installing version 1.32.0 of grpcio:

    third_party/zlib/gzlib.c:252:9: error: implicit declaration of function 'lseek' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
            LSEEK(state->fd, 0, SEEK_END);  /* so gzoffset() is correct */
            ^
    third_party/zlib/gzlib.c:14:17: note: expanded from macro 'LSEEK'
    #  define LSEEK lseek
                    ^
    third_party/zlib/gzlib.c:252:9: note: did you mean 'fseek'?
    third_party/zlib/gzlib.c:14:17: note: expanded from macro 'LSEEK'
    #  define LSEEK lseek
                    ^
    /Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/stdio.h:162:6: note: 'fseek' declared here
    int      fseek(FILE *, long, int);

I'm using the following dependencies:

pip: 20.2.3
python: 3.9.1
gcc:

Configured with: --prefix=/Library/Developer/CommandLineTools/usr --with-gxx-include-dir=/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/c++/4.2.1
Apple clang version 12.0.0 (clang-1200.0.32.28)
Target: x86_64-apple-darwin19.6.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

Interestingly, I'm hitting no such issue when attempting to install the latest stable version of grpcio (1.34.0).

Unable to install with Ruby 3.0.0 #25060

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