I have made the first step on postgresql, but got some problems

[shieldy <shieldly(at)gmail(dot)com>]

few days before, I said I wanto joinin the postgresql develope group. and
recently, I make some progress, such as get throught the base steps. but
when i add some functions to the spatial data, such as box_add1() to box
data, but when I compile it, and install it to my computer, it turns out
,the box_add1() didnot work, but the original one box_add(),which has
existed in the current one, works. so what happened? and I check it, that,
the declaration of the function, I add, can be found in the installed
include files, it's local\pgsql\include\server\utils\geo_decls.h.
anyone can give me some suggestions? thankyou!