Index: getdtablecount.c
===================================================================
--- getdtablecount.c	(revision 290836)
+++ getdtablecount.c	(working copy)
@@ -29,21 +29,25 @@
 
 #include <sys/types.h>
 #include <sys/sysctl.h>
+#ifndef KERN_PROC_NFDS
+#include <errno.h>
+#endif
 #include <stddef.h>
+#include <unistd.h>
 
-int getdtablecount(void);
-
-/* 
- * Return the count of open file descriptors for this process.
- *
- */
+/* Return the count of open file descriptors for this process. */
 int
 getdtablecount(void)
 {
+	/*
+	 * KERN_PROC_NFDS wasn't added until r290473; we need to stub out this
+	 * libcall in order to unbreak bootstrapping from older versions of
+	 * FreeBSD
+	 */
+#ifdef KERN_PROC_NFDS
 	int mib[4];
-	int error;
-	int nfds;
 	size_t len;
+	int error, nfds;
 
 	len = sizeof(nfds);
 	mib[0] = CTL_KERN;
@@ -55,4 +59,8 @@
 	if (error)
 		return (-1);
 	return (nfds);
+#else
+	errno = ENOSYS;
+	return (-1);
+#endif
 }