如果因为有symbols file的影响导致ftbfs，可以尝试着更新xx.symbols文件，具体的方法如下：
最根本的教程是here。
首先安装 pkg-kde-tools 依赖包。
然后要把源码下载下来，可以使用 apt source xx的方法。
pkgkde-getbuildlogs
pkgkde-symbolshelper batchpatch -v 1.6.1 *_unstable_logs/*.build
有可能需要多次的更新symbols文件。
symbols 文件的具体作用
It means that packages depending on a library can relax their version dependencies on that library to the oldest version that supports all the symbols they use. Until the symbols mechanism was invented, whenever a library added a symbol, it bumped its shlibs and after that packages built against the library would require the new version. That made it harder to do (partial) upgrades, testing migration etc.
https://wiki.debian.org/Projects/ImprovedDpkgShlibdeps