set prototyped

hdr nc,exec_attr

mem exception.name,_exception.name math.h

lib setreuid,setregid,nice,sigflag,fork,spawnveg

lib pathnative,pathposix,uwin_path,uwin_unpath,fts_notify

lib fchdir

reference unistd.h

extern nice int (int)

extern setreuid int (uid_t,uid_t)

extern setregid int (gid_t,gid_t)