In my own testing my fifteen game compiles without errors and works perfectly. However, when I checked it with check50 it said that it couldn't initialize the boards correctly, and I got this:
Then I looked at the detailed check and found this:
It's cut off, but on the right it says the error is from line 24, which is calling the math library.
The same error occurs with the 4x4 board.
Any idea what this means/how to fix it? It seems like its an error with one of the libraries, which is strange. It might have something to do with the "-D__useconds_t=long Dusleep=fabs" in the command line, but there's no way for me to change that (is there?).