gcc -c -Wall -O -ggdb board.c
In file included from board.c:30:
colordef.h:9:1: warning: "RED" redefined
In file included from board.c:28:
merc.h:182:1: warning: this is the location of the previous definition
In file included from board.c:30:
colordef.h:10:1: warning: "BLUE" redefined
In file included from board.c:28:
merc.h:185:1: warning: this is the location of the previous definition
In file included from board.c:30:
colordef.h:11:1: warning: "GREEN" redefined
In file included from board.c:28:
merc.h:183:1: warning: this is the location of the previous definition
In file included from board.c:30:
colordef.h:12:1: warning: "BLACK" redefined
In file included from board.c:28:
merc.h:189:1: warning: this is the location of the previous definition
In file included from board.c:30:
colordef.h:13:1: warning: "WHITE" redefined
In file included from board.c:28:
merc.h:188:1: warning: this is the location of the previous definition
In file included from board.c:30:
colordef.h:14:1: warning: "MAGENTA" redefined
In file included from board.c:28:
merc.h:186:1: warning: this is the location of the previous definition
In file included from board.c:30:
colordef.h:15:1: warning: "YELLOW" redefined
In file included from board.c:28:
merc.h:184:1: warning: this is the location of the previous definition
In file included from board.c:30:
colordef.h:16:1: warning: "CYAN" redefined
In file included from board.c:28:
merc.h:187:1: warning: this is the location of the previous definition
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