dnl Copyright (c) 2016 - present Facebook, Inc.
dnl All rights reserved.
dnl
dnl This source code is licensed under the BSD style license found in the
dnl LICENSE file in the root directory of this source tree. An additional grant
dnl of patent rights can be found in the PATENTS file in the same directory.

AC_DEFUN([AC_ASSERT_OCAML_MIN_VERSION],
[dnl
  AC_REQUIRE([AC_PROG_OCAML])

  AC_MSG_CHECKING([if OCaml version is >= $1])

  AC_COMPARE_VERSION_STRINGS([$1], [$OCAMLVERSION],
    [AC_MSG_RESULT([yes])],
    [AC_MSG_ERROR([m4_join([],[found version $OCAMLVERSION.
      m4_newline([  Please upgrade to OCaml >= $1. If you are using opam, you can run])
      m4_newline([dnl
    opam switch $1
    eval \$(opam config env)])
])])])
])