Fixes "integer expression expected" error - #2573
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This happens while compiling OpenSSL or any other non-Ruby package:
ruby-build: line 723: [: : integer expression expected
This was because $ruby_semver was checked as a numeric value but was never set.
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This happens while compiling OpenSSL or any other non-Ruby package:
This was because $ruby_semver was checked as a numeric value but was never set.
Fixes #2572
Followup to #2543