When installing patched versions of Misskey and Sharkey on Fedora 42, compilation errors related to `uint8_t` and `state` may arise due to the default GCC version. This guide provides a workaround by compiling and using a newer version of GCC/G++. The process involves installing necessary dependencies, downloading and extracting the GCC source code, configuring the build with specific flags, and compiling GCC using the `make` command. After installation, the guide details how to modify the `pnpm install` command for Misskey and Sharkey to use the newly compiled GCC, ensuring a successful installation. By following these steps, users can resolve the compilation errors and properly install Misskey and Sharkey on Fedora 42.