CentOS Bitcoin Client Encounters possibly undefined macro:pkg_config_libdir problem solving method

Recently and teachers to learn related courses need to use the Bitcoin client, classmate recommended CentOS client, indeed many things do not need to match, but also encountered a lot of wonderful problems, such as this error:

Possibly undefined Macro:pkg_config_libdirif This token and others are, please use legitimate.
The autoconf documentation.
Autoreconf:/usr/bin/autoconf failed with exit Status:1

Looking for a long time there is no particularly good solution, and then praise Bing, search on the Gihub on the bitcoin source on the classmate's discussion, there is a classmate's suggestion confusedly, um ... The concrete reason that schoolmate also does not know, I also do not understand ...

Is in the Bitcoin folder to find Configure.ac and then modify the source code, the three lines commented ... Just fine ...

It's really a tangle ...

Later steps also encountered a redefinition of the problem, I did not check, directly to the source code comments, the world is quiet ...