Building from source is the process of compiling a program from it's source code. Most commonly done on GNU/Linux systems, rarely Windows or Mac.

Compilation is the process of building an application into an executable from it's code. Depending on the program, it can take hours to compile a complex application.

v. collectively or individually finding someone/something to blame for a problem, as opposed to brainstorming which connotes finding solutions to a problem

n. the act of finding someone/something to blame for a problem

(from a TV ad for HD television)