@lxo
Right; if the program cannot be (easily) built, script or build-system-wise, it cannot be copylefted.
Without a new "freedom 4" (the freedom to build/bootstrap a program and re-create it bit-for-bit using free software) it would still be OK to require build dependencies that themselves cannot be built (or only by injecting pre-built binaries that cannot be verified to have been built exclusively with free software) and copyleft the program.
I think this is very bad and is already undermining software freedom today.
@reproducible_builds
#Bootstrappable