diff --git a/configure.ac b/configure.ac
index 7906e95..3dfb6b1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -102,11 +102,34 @@ then
 fi
 AM_CONDITIONAL(DOC_ENABLED, [test x"$enable_doc" = xyes])
 
+AC_ARG_WITH([os-version], [AS_HELP_STRING([--with-os-version], [For FreeBSD users, use this option to override the detected OSVERSION.])])
+
+case "$build_os" in
+  freebsd*)
+    AC_MSG_CHECKING([the FreeBSD operating system release])
+    if test -n "$with_os_version"; then
+      OSVERSION="$with_os_version"
+    else
+      OSVERSION=`/sbin/sysctl -n kern.osreldate`
+    fi
+    AC_MSG_RESULT([$OSVERSION])
+    AC_MSG_CHECKING([which usb library to use])
+    if test "$OSVERSION" -lt "800069"; then
+      system_has_libusb="no"
+      AC_MSG_RESULT([devel/libusb])
+    else
+      system_has_libusb="yes"
+      AC_MSG_RESULT(system)
+      LIBUSB_LIBS="-lusb"
+    fi
+esac
+
 
 # Dependencies
 PKG_CONFIG_REQUIRES=""
 ## libusb
 if test "x$enable_libusb" = "xyes"; then
+  if test x"$system_has_libusb" != "xyes"; then
   if test x"$PKG_CONFIG" = "x"; then
     AC_PATH_PROG(LIBUSB_CONFIG,libusb-config)
     if test x"$LIBUSB_CONFIG" = "x" ; then
@@ -127,6 +150,7 @@ if test "x$enable_libusb" = "xyes"; then
   if test x"$WITH_USB" = "x0"; then
     AC_MSG_ERROR([libusb is mandatory.])
   fi
+  fi
   AC_SUBST(LIBUSB_LIBS)
   AC_SUBST(LIBUSB_CFLAGS)
 fi