# AC_CHECK_DECLS([AF_ALG],,
# [AC_MSG_ERROR([You need Linux kernel with userspace crypto interface.])],
# [#include <sys/socket.h>])
# AC_CHECK_DECLS([AF_ALG],,
# [AC_MSG_ERROR([You need Linux kernel with userspace crypto interface.])],
# [#include <sys/socket.h>])