here’s some makefile bullshit for you from bearssl’s makefile:

the first 4 lines are microsoft nmake directives. it ignores the escaped newlines, and includes the nmake makefile, because ifndef 0 is always true, so it never reaches the else. on unix, they are hidden because posix specifies that comments start with # and continue until an unescaped newline is reached, so unix makes only see the lines afterwards, and includes the unix makefile.

there’s more, i’ll put it in a comment
#unix #make