During December 2024, this developer enhanced the shadps4-emu/shadPS4 repository by introducing an opt-in mechanism for the userfaultfd feature on Linux systems. Using CMake for build system configuration, they implemented the ENABLE_USERFAULTFD flag, shifting userfaultfd from being enabled by default to requiring explicit activation during compilation. This adjustment improved build safety and reproducibility across different environments, aligning with safer release practices. Their work involved reworking the build and configuration flow to respect the new flag, ensuring that userfaultfd remains disabled unless specifically requested. The focus on build system configuration demonstrated attention to deployment safety and cross-platform consistency.