`ios_base’ undeclared 錯誤及解決

 本來可編譯的代碼，換了個低版本的RedHat就報錯： “`ios_base' undeclared (first use this function)”

估計是低版本的g++所配的libstdc++有問題，但不知如何簡單的解決。

還好一搜就查到一個文章：http://mailman.powerdns.com/pipermail/pdns-users/2003-October/000771.html

Hmm, ios_base is defined in the C++ standard, but it isn't supported by g++
2.95.x. You can replace "ios_base" with "ios" to make it compile with g++
2.95.x (that's what I have done to make it compile on Debian woody).

照樣改一下就好了。