So this isn't really a bug. It's more an update for compliance with the newest incarnation of gcc. So here goes.

imc.c:

char *imc_mudof( const char *src )
{
   static char mud[SMST];
   char *person;

   if( !( person = strchr( src, '@' ) ) )
      imcstrlcpy( mud, src, SMST );
   else
      imcstrlcpy( mud, person + 1, SMST );
   return mud;
}

Becomes:

char *imc_mudof( const char *src )
{
   static char mud[SMST];
   const char *person;

   if( !( person = strchr( src, '@' ) ) )
      imcstrlcpy( mud, src, SMST );
   else
      imcstrlcpy( mud, person + 1, SMST );
   return mud;
}

imc.c, imc_send_social

   CHAR_DATA *skeleton = NULL;
   char *ps;
   char socbuf[LGST], msg[LGST];

Becomes:

   CHAR_DATA *skeleton = NULL;
   const char *ps;
   char socbuf[LGST], msg[LGST], tmp[SMST];

And further down,

         ps[0] = '\0'; 
         imcstrlcpy( mud, ps + 1, SMST );

Becomes:

         imcstrlcpy( tmp, ps, SMST );
         snprintf( mud, SMST, "%s", tmp );

act_wiz.c, do_setrace

FILE *fpList;

Becomes:

FILE *fpList = NULL;

color.c, colorcode

char *sympos = NULL;

Becomes

const char *sympos = NULL;

color.c, colorize

char *colstr;

Becomes

const char *colstr;

mapout.c, map_to_rooms

   int row, col, i, n, x, y, tvnum, proto_vnum = 0, leftmost, rightmost;

Becomes:

   int row, col, i, n, x, y, tvnum, proto_vnum = 0, leftmost, rightmost;

mud_comm.c, get_color

char *cptr;

Becomes:

const char *cptr;

skills.c, check_ability

      mana =
         IS_NPC( ch ) ? 0 : UMAX( skill_table[sn]->min_mana,
                                  100 / ( 2 + ch->level - skill_table[sn]->race_level[ch->race] ) );

Becomes

      mana =
         IS_NPC( ch ) ? 0 : UMAX( skill_table[sn]->min_mana,
                                  100 / ( 2 + ch->level - skill_table[sn]->race_level[ch->race] ) );
      blood = ( mana / 2 );