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15.5.4 Êѹ¹¤µ¤ì¤¿·ë²Ì

¥·¥§¥ëÊÑ¿ô¤ÎDEFS¤òÄ´ºº¤¹¤ë¤³¤È¤Ç¡¤Á°¤Î¥Æ¥¹¥È¤Î·ë²Ì¤òÄ´ºº¤·¤Æ¤¤¤¿ ¾ì¹ç¡¤¤½¤ì¤é¤Î¥Æ¥¹¥È¤ËÂФ¹¤ë¥­¥ã¥Ã¥·¥åÊÑ¿ô¤ÎÃͤòÄ´ºº¤¹¤ë¤³¤È¤ËÀÚ¤êÂØ¤¨¤ë ɬÍפ¬¤¢¤ê¤Þ¤¹¡¥DEFS¤Ïconfigure¼Â¹ÔÃæ¤Ë¤â¸ºß¤·¤Þ¤»¤ó¡¥ ¤½¤ì¤Ï½ÐÎÏ¥Õ¥¡¥¤¥ë¤òÀ¸À®¤¹¤ë¤È¤­¤Î¤ßºîÀ®¤µ¤ì¤Þ¤¹¡¥¥Ð¡¼¥¸¥ç¥ó1¤«¤é¤Î¤³¤Î °ã¤¤¤Ï¡¤Àµ³Î¤Ë¤½¤ÎÊÑ¿ô¤ò°úÍÑÉä¤Ç°Ï¤à¤³¤È¤¬¡¤¤¢¤Þ¤ê¤ËÌñ²ð¤Ç¡¤ AC_DEFINE¤òËè²ó¸Æ¤Ó½Ð¤¹¤³¤È¤Ï¡¤Èó¸úΨ¤À¤Èʬ¤«¤Ã¤¿¤¿¤á¤Ç¤¹¡¥ See Cache Variable Names.

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AC_HAVE_FUNCS(syslog)
case "$DEFS" in
*-DHAVE_SYSLOG*) ;;
*) # syslog is not in the default libraries.  See if it's in some other.
  saved_LIBS="$LIBS"
  for lib in bsd socket inet; do
    AC_CHECKING(for syslog in -l$lib)
    LIBS="$saved_LIBS -l$lib"
    AC_HAVE_FUNCS(syslog)
    case "$DEFS" in
    *-DHAVE_SYSLOG*) break ;;
    *) ;;
    esac
    LIBS="$saved_LIBS"
  done ;;
esac

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AC_CHECK_FUNCS(syslog)
if test $ac_cv_func_syslog = no; then
  # syslog is not in the default libraries.  See if it's in some other.
  for lib in bsd socket inet; do
    AC_CHECK_LIB($lib, syslog, [AC_DEFINE(HAVE_SYSLOG)
      LIBS="$LIBS -l$lib"; break])
  done
fi

°úÍÑÉä¤ÎÁ°¤Ë¥Ð¥Ã¥¯¥¹¥é¥Ã¥·¥å¤ò²Ã¤¨¤ë¤³¤È¤Ç¡¤AC_DEFINE_UNQUOTED ¤Ç ¥Ð¥°¤¬À¸¤¸¤ë¾ì¹ç¡¤¤½¤ì¤òºï½ü¤¹¤ëɬÍפ¬¤¢¤ê¤Þ¤¹¡¥º£¤ÏͽÁÛÄ̤ê¤Ëưºî¤·¡¤ (¥Ð¥Ã¥¯¥¹¥é¥Ã¥·¥å°Ê³°¤Î)°úÍÑÉä¤òÆÃḚ̂·¤¤¤·¤Þ¤»¤ó¡¥See Setting Output Variables.

¸½ºß¡¤Autoconf¥Þ¥¯¥í¤¬ÀßÄꤷ¤¿¿¿µ¶ÃͤΥ·¥§¥ëÊÑ¿ô¤Î¤¹¤Ù¤Æ¤Ï¡¤¿¿¤ÎÃͤËÂФ· ¤Æ‘yes’¤¬»ÈÍѤµ¤ì¡¥µ¶¤ËÂФ·¤Æ¤Ï¤Û¤È¤ó¤É‘no’¤ò»ÈÍѤ·¤Þ¤¹¤¬¡¤²¼ °Ì¸ß´¹À­¤Î¤¿¤á¡¤Âå¤ï¤ê¤Ë¶õ¤Îʸ»úÎó¤ò»ÈÍѤ¹¤ë¤â¤Î¤â¤¢¤ê¤Þ¤¹¡¥¿¿¤ËÂФ·¤Æ1 ¤ä‘t’¤Ë¥·¥§¥ëÊÑ¿ô¤¬ÀßÄꤵ¤ì¤ë¤³¤È¤ò´üÂÔ¤¹¤ë¾ì¹ç¡¤¥Æ¥¹¥È¤òÊѹ¹¤¹¤ëɬ Íפ¬¤¢¤ê¤Þ¤¹¡¥