Sometimes I want to use an open source library or something and it's honestly days of fighting with compiler flags and environment variables and versions of compilers. There's always undefined symbols or other mystery failures. Last time I did this, the makefile failed because I was getting a source file from a badly configured web server that caused the downloaded file to get corrupted with some downloaders but not others. So there's learning about idiosyncrasies of the HTTP protocol too. It's a complete clownpants nightmare of wasted time.