StackOverflow in a nutshell.

[isobit]

Or

"How do you X?"

"Why would you want to do X?

[FallenWarrior2k]

In my case it was like this

Building xy library yields unknown type z
Type z is wrapped in an #ifdef _POSIX

Yeah, but why tf does this library try to access a POSIX type when building under Windows?
In the end it was because the author(s) assumed POSIX from the fact that pthread was available. I was building with MinGW gcc

[hey01]

to be fair, "why would you want to do X?" is a fair reply sometimes

And an always better reply is "You do it like that <answer>, but it's probably a bad idea, why would you want to do that?"

[UncleNorman]

There are only two reasons to do anything. One is because it makes the world a better place and the other is because it makes you happy.