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Upcoming autoconf-2.70 exposes deficiency in configure.ac: ``` $ autoconf-2.70_beta2 && ./configure --host=x86_64-pc-linux-gnu ./configure: line 1430: 5: Bad file descriptor checking whether is declared... ./configure: line 1432: ${+y}: bad ``` It happens because macros are called with parameters using insufficient quoting. More details at https://lists.gnu.org/archive/html/bug-autoconf/2020-10/msg00027.html The fix only amends `--with-linux-input`. Other cases of underquoting will need to be handled separately. Fix-by: Zack Weinberg Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
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