git clone --recurse https://github.com/IntriguingTiles/HLFixes
Open HLFixes.sln
and build it. It should build with Visual Studio 2017 and up. I use VS2022 with MSVC v141_xp.
git clone --recurse https://github.com/IntriguingTiles/HLFixes
cd Linux && mkdir build && cd build
If you're going to make a build that is intended to run on machines other than your own, you should build within the Steam Runtime SDK.
schroot --chroot steamrt_scout_i386 -- cmake -DCMAKE_CXX_COMPILER=g++-9 -DCMAKE_C_COMPILER=gcc-9 ..
schroot --chroot steamrt_scout_i386 -- make
cmake ..
make