Escape square brackets in configure.ac
This patch attempts to solve the regression introduced in e8b0efdc
(#2607).
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@ -275,7 +275,7 @@ test "$prefix" = NONE && prefix=$ac_default_prefix
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test "$exec_prefix" = NONE && exec_prefix='${prefix}'
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for name in $ac_subst_vars; do
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for _ in 1 2 3; do
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if printf '%s' "${name}" | egrep '^[_[:alpha:]][_[:alnum:]]*$'
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if printf '%s' "${name}" | egrep '^[[_[[:alpha:]]]][[_[[:alnum:]]]]*$'
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then
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eval "${name}"="$(eval echo "\${${name}}")"
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fi
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