AC_CHECK_HEADERS([fcntl.h],
[],[AC_MSG_ERROR([header is required])])
AC_CHECK_HEADERS([fcntl.h],
[],[AC_MSG_ERROR([header is required])])
AM_CONDITIONAL([HAVE_ERROR_H],[test "x$ac_cv_header_error_h" = xyes])
AM_CONDITIONAL([HAVE_VFORK],[test "x$ac_cv_func_vfork_works" = xyes])
AM_CONDITIONAL([HAVE_ERROR_H],[test "x$ac_cv_header_error_h" = xyes])
AM_CONDITIONAL([HAVE_VFORK],[test "x$ac_cv_func_vfork_works" = xyes])