[libev]error while loading shared libraries: libev.so.4

        用./configure、make、make install安裝完libev後，寫一個簡單程式server.c，編譯，gcc server.c -o server lev。

産生如下錯誤：error while loading shared libraries: libev.so.4: cannot open shared object file: No such file or directory

        解決方案：

在安裝libev時，configure要指定安裝路徑，./configure --prefix=/usr，然後make && make install，不然預設安裝在/usr/local/lib中，搜尋路徑搜不到