AC_MSG_ERROR([db.h not found. Use the correct -I flag, or install the Berkeley db development package.])
fi
AC_MSG_CHECKING([whether db is at least 4.1])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <$db_header>]], [[int array[(DB_VERSION_MAJOR > 4 || (DB_VERSION_MAJOR == 4 && DB_VERSION_MINOR >= 1))-1];]])],[AC_MSG_RESULT([yes])],[AC_MSG_ERROR([no. you need at least db 4.1])])