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The acinclude.m4 uses AS_VAR_APPEND macro. This marco is introduced in 2.64[1], hence we bump AC_PREREQ to 2.64 to avoid undefined marco on 2.63 autoconf. [1] https://lists.gnu.org/archive/html/autoconf/2009-07/msg00079.html Signed-off-by: Huáng Jùnliàng <i@jhuang.me> Signed-off-by: Allan McRae <allan@archlinux.org>
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