Blame m4/pty.m4

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AC_DEFUN([LFTP_PTY_CHECK],[
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case "$host" in
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*-*-linux*)	no_dev_ptmx=1; no_dev_ptc=1;;
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*-*-sco3.2v4*)	no_dev_ptmx=1;;
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*-*-sco3.2v5*)	no_dev_ptmx=1;;
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esac
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if test -z "$no_dev_ptmx" ; then
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   AC_CHECK_FILE("/dev/ptmx", [
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      AC_DEFINE(HAVE_DEV_PTMX,1,[define if you have /dev/ptmx device])])
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fi
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if test -z "$no_dev_ptc" ; then
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   AC_CHECK_FILE("/dev/ptc", [
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      AC_DEFINE(HAVE_DEV_PTS_AND_PTC,1,[define if you have /dev/ptc device])])
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fi
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AC_CHECK_HEADERS([util.h sys/stropts.h pty.h])
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AC_SEARCH_LIBS(openpty,util,
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   [AC_DEFINE(HAVE_OPENPTY,1,[define if you have openpty function])])
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AC_CHECK_FUNCS([_getpty])
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])