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CRTSCTS undefined?

I'm having trouble using the cflag CRTSCTS when setting up my ttyS device.

I'm including <termios.h> in my program, and the reason CRTSCTS is not defined 
is because


is used, which includes


and here CRTSCTS is only defined when __USE_MISC is defined.

Is this the way it's supposed to work? (and do I need to define __USE_MISC? 
and where?)

Or is there a problem with my header file locations? I think when
os/linux/include/termios.h was used instead, it would have included 
os/linux/include/asm/termios.h, which on it's turn includes 
os/linux/include/asm/termbits.h, which defines CRTSCTS without requiring any 
special definitions like __USE_MISC.

What's the preferred way to fix this?

Best regards,