We need to ensure that the openjfx/jfx-dev/rt repo documents the version of compilers and other platform tools that are used to build the FX releases. It needs to be in the repo so that changes to the tools are tracked along with the source code. Note that the JDK does this with the jib configuration.
Related to this we might also want to document the minimum OS and compiler versions for each platform needed to build the default SDK (without media and webkit) and the full SDK (including media and WebKit) as a convenience for developers.