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dnl Copyright (c) 2016-present, Facebook, Inc.
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dnl
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dnl This source code is licensed under the MIT license found in the
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dnl LICENSE file in the root directory of this source tree.
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AC_DEFUN([AC_ASSERT_OCAML_MIN_VERSION],
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[dnl
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AC_REQUIRE([AC_PROG_OCAML])
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AC_MSG_CHECKING([if OCaml version is >= $1])
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AC_COMPARE_VERSION_STRINGS([$1], [$OCAMLVERSION],
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[AC_MSG_RESULT([yes])],
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[AC_MSG_ERROR([m4_join([],[found version $OCAMLVERSION.
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m4_newline([ Please upgrade to OCaml >= $1. If you are using opam, you can run])
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m4_newline([dnl
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opam switch $1
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eval \$(opam env)])
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])])])
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])
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