error compiling hal

[Matt Rose <mattrose folkwolf net>]

I've done DAYS of searching, and I can't figure out which library or 
program provides this header file!

hald.c:42:28: sys/capability.h: No such file or directory
hald.c: In function `drop_privileges':
hald.c:258: error: `cap_t' undeclared (first use in this function)
hald.c:258: error: (Each undeclared identifier is reported only once
hald.c:258: error: for each function it appears in.)
hald.c:258: error: parse error before "cap"
hald.c:298: error: `cap' undeclared (first use in this function)
hald.c:298: warning: implicit declaration of function `cap_from_text'
hald.c:300: warning: implicit declaration of function `cap_set_proc'
hald.c:305: warning: implicit declaration of function `cap_free'
make[4]: *** [hald.o] Error 1


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Matt Rose 	 http://www.folkwolf.net	   mattrose folkwolf net
He's a sword-wielding arachnophobic werewolf searching for his wife's
true killer. She's a mistrustful paranoid Hell's Angel in the wrong
place at the wrong time. They fight crime!