irrlichtmt fails to build on Mac OS 10.7 but there is a fix

[programmingkidx]

When I was trying to install minetest it's dependency irrlichtmt failed to build. The log contains all the details about what went wrong. Some of the errors include:

irrlicht-1.9.0mt10/include/irrString.h:955:26: error: use of undeclared identifier 'mbstowcs'
:info:build                 const size_t written = mbstowcs(&destination[0], source, (size_t)sourceSize);

irrlicht-1.9.0mt10/include/irrString.h:1001:52: error: cannot initialize a parameter of type 'wchar_t' with an lvalue of type 'const wchar_t *'
:info:build                 const size_t written = wcstombs(&destination[0], source, destination.size());
:info:build                                                                  ^~~~~~
:info:build /usr/include/wchar.h:148:42: note: passing argument to parameter here
:info:build size_t  wcrtomb(char * __restrict, wchar_t, mbstate_t * __restrict);

Currently the irrlichtmt port being used is version 1.9.0mt10. The newest version is irrlicht-1.9.0mt14. I downloaded this version it was able to build it successfully. I just had to specify the compiler to use. This is the command I used to make the cmake step work:

cmake . -DBUILD_SHARED_LIBS=OFF -D CMAKE_C_COMPILER=clang-mp-16 -D CMAKE_CXX_COMPILER=clang++-mp-16

I picked clang-mp-16 because it was already on my system. I don't know if an older version world work. From the error message I saw it looks like a compiler that supports CXX17 should work.

This is where I downloaded irrlichtmt: ​https://github.com/minetest/irrlicht/releases/tag/1.9.0mt14