Summary

Building the CDriver on a M1 macOS fails because of a call to an undeclared function (getpagesize). However, this function is available on macOS M1. Using the configuration and the build commands listed below, the c driver can't be built.

Environment

C driver version is 1.23.0

The host is on MacOS Monterey 12.6 on the M1 chip ARM64. 

clang version 15.0.2

How to Reproduce

These steps were taken from the C Driver Getting Started guide.

Configure cmake:

cmake \    
-DCMAKE_C_COMPILER="<path to LLVM>/bin/clang" \    
-DENABLE_MAINTAINER_FLAGS=ON \    
-DMONGO_SANITIZE="address;leak" \    
-B./cmake-build 

Then build the executables:

cmake --build cmake-build --target example-client 

Then run the executable 

./cmake-build/src/libmongoc/example-client 

This error will appear in 
mongo-c-driver/src/libmongoc/src/mongoc/mongoc-counters.c

error: call to undeclared function 'getpagesize'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration] return BSON_MAX (getpagesize (), size);