事情是这样的，本来系统的FREEBSD 6.0。升级内核到6.2之后，编译出错，唯有重新Configure,结果他出现一大堆这样的玩意,太多了，只截取一部分
## ----------------------------- ##
configure: WARNING: ## Report this to dev@dev.kcn.cn ##
configure: WARNING: ## ----------------------------- ##
checking for fcntl.h... yes
checking limits.h usability... no
checking limits.h presence... yes
configure: WARNING: limits.h: present but cannot be compiled
configure: WARNING: limits.h: check for missing prerequisite headers?
configure: WARNING: limits.h: see the Autoconf documentation
configure: WARNING: limits.h: section "Present But Cannot Be Compiled"
configure: WARNING: limits.h: proceeding with the preprocessor's result
configure: WARNING: limits.h: in the future, the compiler will take precedence
configure: WARNING: ## ----------------------------- ##
configure: WARNING: ## Report this to dev@dev.kcn.cn ##
configure: WARNING: ## ----------------------------- ##
执行过.autogen.sh了。
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