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4.8.1 ¥³¥ó¥Õ¥£¥°¥ì¡¼¥·¥ç¥ó¥Ø¥Ã¥À¤Î¥Æ¥ó¥×¥ì¡¼¥È

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AC_CONFIG_HEADERS([conf.h])
AC_CHECK_HEADERS([unistd.h])

conf.h.in¤Ç°Ê²¼¤Î¤è¤¦¤Ê¥³¡¼¥É¤ò½ñ¤­¤Þ¤¹¡¥unistd.h¤¬¤¢¤ë¥· ¥¹¥Æ¥à¤Ç¤Ï¡¤configure¤Ï‘#define’ ‘HAVE_UNISTD_H’ ¤ò1 ¤Ë¤·¤Þ¤¹¡¥¤½¤ì°Ê³°¤Î¥·¥¹¥Æ¥à¤Ç¤Ï¡¤¹ÔÁ´ÂΤ¬¥³¥á¥ó¥È¥¢¥¦¥È¤µ¤ì¤Þ¤¹(¤½¤Î¥· ¥¹¥Æ¥à¤Î¾ì¹ç¡¤¥·¥ó¥Ü¥ë¤ÏÁ°¤â¤Ã¤ÆÄêµÁ¤µ¤ì¤Þ¤»¤ó)¡¥

/* Define as 1 if you have unistd.h.  */
#undef HAVE_UNISTD_H

#undef’¤¬ºÇ½é¤ÎÎó¤Ë¤¢¤ê¡¤‘HAVE_UNISTD_H’¤Î¸å¤Ë¶õÇò¤¹¤é¤Ê¤¤¤³ ¤È¤ËÃí°Õ¤·¤Æ¤¯¤À¤µ¤¤¡¥¤½¤Î¸å¤Ç¡¤¥×¥ê¥×¥í¥»¥Ã¥µÌ¿Îá¤ò»ÈÍѤ·¤Æ¤¤¤ë¥³¥ó¥Õ¥£ ¥°¥ì¡¼¥·¥ç¥ó¥Ø¥Ã¥À¤ò¥Ç¥³¡¼¥É¤¹¤ë¤³¤È¤¬²Äǽ¤Ç¤¹¡¥

#include <conf.h>

#if HAVE_UNISTD_H
# include <unistd.h>
#else
/* We are in trouble.  */
#endif

#undef’¤ÎÂå¤ï¤ê¤Ë‘#define’¤òÍѤ¤¤Æ¤¤¤ë¡¤¸Å¤¤·Á¼°¤Î¥Æ¥ó¥×¥ì¡¼ ¥È¤Î»ÈÍѤϡ¤¶¯¤¯È¿ÂФ·¤Þ¤¹¡¥‘#undef’¤ÈƱ¤¸¹Ô¤Ë¥³¥á¥ó¥È¤¬¤¢¤ë¸Å¤¤¥Æ ¥ó¥×¥ì¡¼¥È¤âƱÍͤǤ¹¡¥¤È¤Ë¤«¤¯¡¤¥×¥í¥»¥Ã¥µ¥Þ¥¯¥í¤Ë¥³¥á¥ó¥È¤ò½ñ¤¯¤Î¤Ï¡¤·è ¤·¤Æ¤è¤¤¹Í¤¨¤Ç¤Ï¤¢¤ê¤Þ¤»¤ó¡¥

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