Within mud.h change:
/*
 * Channel bits.
 */
#define	CHANNEL_AUCTION		   BV00
#define	CHANNEL_CHAT		   BV01
#define	CHANNEL_QUEST		   BV02
#define	CHANNEL_IMMTALK		   BV03
#define	CHANNEL_MUSIC		   BV04
#define	CHANNEL_ASK		   BV05
#define	CHANNEL_SHOUT		   BV06
#define	CHANNEL_YELL		   BV07
#define CHANNEL_MONITOR		   BV08
#define CHANNEL_LOG		   BV09
#define CHANNEL_HIGHGOD		   BV10
#define CHANNEL_CLAN		   BV11
#define CHANNEL_BUILD		   BV12
#define CHANNEL_HIGH		   BV13
#define CHANNEL_AVTALK		   BV14
#define CHANNEL_PRAY		   BV15
#define CHANNEL_COUNCIL 	   BV16
#define CHANNEL_GUILD              BV17
#define CHANNEL_COMM		   BV18
#define CHANNEL_TELLS		   BV19
#define CHANNEL_ORDER              BV20
#define CHANNEL_NEWBIE             BV21
#define CHANNEL_WARTALK            BV22
#define CHANNEL_RACETALK           BV23
#define CHANNEL_WARN               BV24
#define CHANNEL_WHISPER		   BV25
#define CHANNEL_AUTH		   BV26
#define CHANNEL_TRAFFIC		   BV27
 Into:

/*
 * Channel bits.
 */

typedef enum
{
  CHANNEL_AUCTION, CHANNEL_CHAT, CHANNEL_QUEST, CHANNEL_IMMTALK, CHANNEL_MUSIC, 
  CHANNEL_ASK, CHANNEL_SHOUT, CHANNEL_YELL, CHANNEL_MONITOR, CHANNEL_LOG, 
  CHANNEL_HIGHGOD, CHANNEL_CLAN, CHANNEL_BUILD, CHANNEL_HIGH, CHANNEL_AVTALK, 
  CHANNEL_PRAY, CHANNEL_COUNCIL, CHANNEL_GUILD, CHANNEL_COMM, CHANNEL_TELLS, 
  CHANNEL_ORDER, CHANNEL_NEWBIE, CHANNEL_WARTALK, CHANNEL_RACETALK, 
  CHANNEL_WARN, CHANNEL_WHISPER, CHANNEL_AUTH, CHANNEL_TRAFFIC		   
} channel_bits;

 in the char_data structure change:
    int			deaf;
 into
    EXT_BV		deaf;

 in save.c
In fwrite_char change:
    if ( ch->deaf )
      fprintf( fp, "Deaf         %d\n",	ch->deaf		);
 into:
    if ( !xIS_EMPTY(ch->deaf) )
      fprintf( fp, "Deaf         %s\n",	fprint_bitvector(&ch->deaf)		);

 in fread_char change:
	    KEY( "Deaf",	ch->deaf,		fread_number( fp ) );
 into:
	    KEY( "Deaf",	ch->deaf,		fread_bitvector( fp ) );

 
In act_info.c
inside do_channels:

change all macros for ch->deaf into extended bitvector macros.
IS_SET becomes xIS_SET
REMOVE_BIT becomes xREMOVE_BIT
SET_BIT becomes xSET_BIT

In act_comm.c do likewise by searching all references of ->deaf