Added Darwin 8.0 specific headers.

diff --git a/configure b/configure
index ac49260..237d6d2 100755
--- a/configure
+++ b/configure
@@ -7099,6 +7099,8 @@
 
 
 
+
+
 for ac_header in \
 	arpa/inet.h \
 	arpa/nameser.h \
@@ -7127,7 +7129,9 @@
 	linux/param.h \
 	linux/serial.h \
 	linux/ucdrom.h \
+	mach/machine.h \
 	machine/cpu.h \
+	machine/limits.h \
 	mntent.h \
 	netdb.h \
 	netinet/in.h \