Serial I/O with GH3.6

Have just installed the NetOS/6 upgrade incorporating GH3.6. Am using the “latest” compiler (rather than the “compatibility” one). Have a C++ module from which I am accessing the serial ports. However the compiler does not recognise open(), read() etc as valid functions. (Seems to sort it out if I lift the definitions from ind_io.c and declare them as C functions). Is this intentional or a bug? (There was a similar problem in one of the earlier releases). Regards Steve