CFLAGS and CXXFLAGS must not be set during the building of
        cross-tools.
      
        To disable CFLAGS and CXXFLAGS use the following commands:
      
unset CFLAGS unset CXXFLAGS
        Now add these to ~/.bashrc, just in
        case you have to exit and restart building later:
      
echo unset CFLAGS >> ~/.bashrc echo unset CXXFLAGS >> ~/.bashrc