dnl Copyright (c) 2016-present, Facebook, Inc.
dnl
dnl This source code is licensed under the MIT license found in the
dnl LICENSE file in the root directory of this source tree.

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)])
])])])
])
