o AIX 7 defines sys_nerr in errno.h, therefore <errno.h> included in the sys_nerr test. o When sys_nerr and _sys_nerr are missed on a particular platform and our euristic for a maximum errno detection applied always print the maximum errno number we reached instead of printing void.[*] * patch from Maxim Dounin This commit makes possible to build nginx on AIX 7.1.