None of the files that were mentioned there. Just 1 file from the src folder, renewal.h.
I'm not really sure if I've fixed it already but another one came up instead of the first post.
npc.c: In function 'npc_parse_mapflag':
npc.c:3734: error: 'MAX_SKILL_DAMAGE_RATE' undeclared (first use in this function)
npc.c:3734: error: (Each undeclared identifier is reported only once
npc.c:3734: error: for each function it appears in.)
make[1]: Leaving directory `/home/trincli0307/trunk/src/map'
make[1]: *** [obj_sql/npc.o] Error 1
make: *** [map] Error 2
Files I edited before the errors occured, skill_db, skill_tree and renewal.h. Even after restoring their original copy I'm still getting errors during compilation.