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/usr/lib/iraf/lib/xwhen.h is in iraf-dev 2.16.1+2018.03.10-2.

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# XWHEN.H -- Exception handling definitions.

define	X_ACV	    501		    # access violation
define	X_ARITH     502		    # arithmetic error
define	X_INT	    503		    # keyboard interrupt
define	X_IPC	    504		    # write to IPC with no reader
define	X_IGNORE    NULL	    # ignore exception