Please look into capabilities/src/zig-cache/o/1500ada649b2a8dfb691e673fcdc122b/cimport.zig for an example of zig translation of C's #includes.
This cimport.zig is generated from @cInclude() which is in capabilities/src/zig_helper.zig.
The build directory is also needed because these @cInclude() files depend on generated files in the build directory e.g. musllibc.
There are 3 sets of errors in the cimport.zig file, they can be found by searching for // comments in cimport.zig: line 198-214, line 3845-3858, line 5879-6090.
There are also omitted errors like not having size_t typedefs in the cimport.zig