diff -Nurd jicmp6-1.0.1/configure.ac jicmp6-1.0.1-new/configure.ac
--- jicmp6-1.0.1/configure.ac	2011-07-29 14:48:35.000000000 -0400
+++ jicmp6-1.0.1-new/configure.ac	2011-08-18 10:16:37.000000000 -0400
@@ -42,17 +42,13 @@
 CPPFLAGS="$CPPFLAGS $JNI_INCLUDES -I."
 AC_CHECK_HEADER([jni.h], [], [AC_MSG_ERROR([cannot find jni.h header with CPPFLAGS="$CPPFLAGS"])])
 
-AC_CHECK_HEADERS([netinet/in.h])
-AC_CHECK_HEADERS([netinet/icmp6.h],[],[],[
-#ifdef HAVE_NETINET_IN_H
-#include <netinet/in.h>
-#endif
-
-])
-AC_CHECK_HEADERS([sys/types.h AvailabilityMacros.h libkern/OSByteOrder.h architecture/byte_order.h byteswap.h errno.h malloc.h netdb.h stdlib.h sys/byteorder.h sys/time.h], [], [], [
+AC_CHECK_HEADERS([sys/types.h AvailabilityMacros.h libkern/OSByteOrder.h architecture/byte_order.h byteswap.h errno.h malloc.h netdb.h stdlib.h sys/byteorder.h sys/time.h netinet/in.h netinet/icmp6.h], [], [], [
 #ifdef HAVE_SYS_TYPES_H
 #include <sys/types.h>
 #endif
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
 ])
 
 # check for socklen_t