configure: use AC_USE_SYSTEM_EXTENSIONS
On glibc, posix_openpt requires _XOPEN_SOURCE >= 600 Gbp-Pq: Name luit-system-extensions.diff
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@ -30,13 +30,13 @@ AM_MAINTAINER_MODE
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m4_ifndef([XORG_MACROS_VERSION],
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[m4_fatal([must install xorg-macros 1.8 or later before running autoconf/autogen])])
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XORG_MACROS_VERSION(1.8)
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AC_USE_SYSTEM_EXTENSIONS
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XORG_DEFAULT_OPTIONS
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AC_CONFIG_HEADERS([config.h])
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AC_CANONICAL_HOST
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AC_CHECK_HEADERS([pty.h stropts.h sys/param.h sys/select.h])
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AC_CHECK_FUNCS([select grantpt posix_openpt])
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