編譯安裝nginx需要pcre包，未安裝會有如下提示：
./configure: error: the HTTP rewrite module requires the PCRE library. You can either disable the module by using --without-http_rewrite_module option, or install the PCRE library into the system, or build the PCRE library statically from the source with nginx by using --with-pcre=<path> option.
需要安裝pcre的devel包，pcre-devel。使用yum安裝即可：（以下命令還帶有ssl、zlib等依賴的安裝）
yum -y install zlib zlib-devel openssl openssl--devel pcre pcre-devel