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[DOC] mentioned minimum versions of tools [ci skip]

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Nobuyoshi Nakada 2019-08-03 14:56:41 +09:00
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@ -257,9 +257,9 @@ Install the prerequisite dependencies for building the CRuby interpreter to
run tests.
* C compiler
* autoconf
* bison
* gperf
* autoconf - 2.67 or later, preferably 2.69.
* bison - 2.0 or later, preferably 3.4.
* gperf - 3.0.3 or later, preferably 3.1.
* ruby - Ruby itself is prerequisite in order to build Ruby from source. It
can be 1.8.