Detected operating system: $(uname -s 2>&1)-UNKNOWN
Detected host architecture: UNKNOWN
Checking for host cc ... gcc 
Checking for cross compilation ... yes 
The architecture of your CPU (UNKNOWN) is not supported by this configure script
It seems nobody has ported MPlayer to your OS or CPU type yet.

Error: unsupported architecture UNKNOWN

Check "configure.log" if you do not understand why it failed.