--- configure.in.org	2016-04-14 11:50:05.558411000 +0900
+++ configure.in	2016-04-14 15:36:51.095101000 +0900
@@ -1106,6 +1106,7 @@
 dnl Straightforward OS determination
 case "$canonical" in
   *-*-linux*    ) opsys=linux ;;
+  *-*-freebsd*  ) opsys=freebsd ;;
   *-*-netbsd*   ) opsys=netbsd ;;
   *-*-openbsd*	) opsys=openbsd ;;
   *-*-nextstep* ) opsys=nextstep ;;
@@ -4596,7 +4597,7 @@
 dnl Check for Berkeley DB.
 if test "$with_database_berkdb" != "no"; then
   AC_MSG_CHECKING(for Berkeley db.h)
-  for header in "db/db.h" "db.h"; do
+  for header in "/usr/include/db.h" "db/db.h" "db.h"; do
     case "$opsys" in
         *freebsd*)
     AC_TRY_COMPILE([