Do not depend on HAVE_SYSCTL when deciding

whether to include files.  Include <sys/param.h> if
HAVE_SYS_PARAM_H (not HAVE_SYSCTL).
(main) [defined __POWERPC__]: Add a kludge to work around a
Mac OS X bug, so that uname -p defaults to "powerpc" if
sysctl ((int[]) {CTL_HW, HW_MACHINE_ARCH}, 2, buffer, &bufsize, 0, 0)
fails.  Problem reported by Petter Reinholdtsen in:
http://lists.gnu.org/archive/html/bug-gnu-utils/2003-02/msg00201.html

src/uname.c

@@ -29,8 +29,10 @@
 # include <sys/systeminfo.h>
 #endif
 
-#if HAVE_SYSCTL && HAVE_SYS_SYSCTL_H
-# include <sys/param.h> /* needed for OpenBSD 3.0 */
+#if HAVE_SYS_SYSCTL_H
+# if HAVE_SYS_PARAM_H
+#  include <sys/param.h> /* needed for OpenBSD 3.0 */
+# endif
 # include <sys/sysctl.h>
 # ifdef HW_MODEL
 #  ifdef HW_MACHINE_ARCH
@@ -260,6 +262,11 @@ main (int argc, char **argv)
 	  static int mib[] = { CTL_HW, UNAME_PROCESSOR };
 	  if (sysctl (mib, 2, processor, &s, 0, 0) >= 0)
 	    element = processor;
+# ifdef __POWERPC__
+	  /* This kludge works around a bug in Mac OS X.  */
+	  if (element == unknown)
+	    element = "powerpc";
+# endif
 	}
 #endif
       print_element (element);