build failed: :error: use of undeclared identifier 'WIFEXITED'

[Martinfx]

Describe the bug

FAILED: CMakeFiles/vcpkg-test.dir/src/vcpkg-test/system.process.cpp.o 
/usr/bin/c++ -DVCPKG_BASE_VERSION=2999-12-31 -DVCPKG_VERSION=unknownhash -D_FILE_OFFSET_BITS=64 -I/usr/home/maxfx/Documents/FreeBSD-Ports/vcpkg/work/vcpkg-2024.09.30/buildtrees/_vcpkg/src/vcpkg-tool-2024-09-30/include -I/usr/home/maxfx/Documents/FreeBSD-Ports/vcpkg/work/vcpkg-2024.09.30/buildtrees/_vcpkg/build/_deps/fmt-src/include -I/usr/home/maxfx/Documents/FreeBSD-Ports/vcpkg/work/vcpkg-2024.09.30/buildtrees/_vcpkg/build/_cmrc/include -O3 -DNDEBUG -std=c++17 -pthread -Winvalid-pch -Xclang -include-pch -Xclang /usr/home/maxfx/Documents/FreeBSD-Ports/vcpkg/work/vcpkg-2024.09.30/buildtrees/_vcpkg/build/CMakeFiles/vcpkglib.dir/cmake_pch.hxx.pch -Xclang -include -Xclang /usr/home/maxfx/Documents/FreeBSD-Ports/vcpkg/work/vcpkg-2024.09.30/buildtrees/_vcpkg/build/CMakeFiles/vcpkglib.dir/cmake_pch.hxx -MD -MT CMakeFiles/vcpkg-test.dir/src/vcpkg-test/system.process.cpp.o -MF CMakeFiles/vcpkg-test.dir/src/vcpkg-test/system.process.cpp.o.d -o CMakeFiles/vcpkg-test.dir/src/vcpkg-test/system.process.cpp.o -c /usr/home/maxfx/Documents/FreeBSD-Ports/vcpkg/work/vcpkg-2024.09.30/buildtrees/_vcpkg/src/vcpkg-tool-2024-09-30/src/vcpkg-test/system.process.cpp
/usr/home/maxfx/Documents/FreeBSD-Ports/vcpkg/work/vcpkg-2024.09.30/buildtrees/_vcpkg/src/vcpkg-tool-2024-09-30/src/vcpkg-test/system.process.cpp:52:9: error: use of undeclared identifier 'WIFEXITED'
   52 |     if (WIFEXITED(return_value))
      |         ^
/usr/home/maxfx/Documents/FreeBSD-Ports/vcpkg/work/vcpkg-2024.09.30/buildtrees/_vcpkg/src/vcpkg-tool-2024-09-30/src/vcpkg-test/system.process.cpp:54:17: error: use of undeclared identifier 'WEXITSTATUS'
   54 |         REQUIRE(WEXITSTATUS(return_value) == 0x000000FFul);
      |                 ^
/usr/home/maxfx/Documents/FreeBSD-Ports/vcpkg/work/vcpkg-2024.09.30/buildtrees/_vcpkg/src/vcpkg-tool-2024-09-30/src/vcpkg-test/system.process.cpp:54:17: error: use of undeclared identifier 'WEXITSTATUS'
/usr/home/maxfx/Documents/FreeBSD-Ports/vcpkg/work/vcpkg-2024.09.30/buildtrees/_vcpkg/src/vcpkg-tool-2024-09-30/src/vcpkg-test/system.process.cpp:54:17: error: use of undeclared identifier 'WEXITSTATUS'
4 errors generated.

Environment

• OS: FreeBSD hades 13.3-RELEASE-p6 FreeBSD 13.3-RELEASE-p6 GENERIC amd64
• Compiler: FreeBSD clang version 17.0.6 (https://github.com/llvm/llvm-project.git llvmorg-17.0.6-0-g6009708b4367)

To Reproduce
Steps to reproduce the behavior:

1. git clone https://github.com/Martinfx/FreeBSD-Ports/blob/4c18c9684bd53d11085297f6d7ab24056e531ae0/vcpkg/Makefile
2. make

Expected behavior
A clear and concise description of what you expected to happen.

Failure logs
make.log

Additional context
Add any other context about the problem here.