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Fixes checking bison version 2.7.1.1194-51a4 >= 2.4... Bareword found where operator expected at -e line 1, near "51a4" (Missing operator before a4?) syntax error at -e line 1, near "51a4 " Execution of -e aborted due to compilation errors. This is due to not quoting the string when calling 'perl' to check the version number. The - sign causes a syntax error. https://bugzilla.gnome.org/show_bug.cgi?id=728946
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