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configure*: Fix wrong quote character in AC_MSG_ERROR
Square brackets are used as quotes in autoconf. From Section 8.1.1, Active Characters of the Autoconf manual[1]: > To fully understand where proper quotation is important, you first > need to know what the special characters are in Autoconf: ‘#’ > introduces a comment inside which no macro expansion is performed, ‘,’ > separates arguments, ‘[’ and ‘]’ are the quotes themselves, ‘(’ and > ‘)’ (which M4 tries to match by pairs), and finally ‘$’ inside a macro > definition. [1] https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.70/autoconf.html#Active-Characters
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