kind of works? reading multiple mice: any c programmers want to look at this?

[SpriggsySpriggs]

You don't have to put the headers in the same folder as the other includes. All you have to do is either have it with QB64 or just put it into a subfolder and use the relative path. I typically just keep headers and bas files in the QB64 parent directory. Or I make a subfolder and reference them using the relative paths. For instance, if I have a header in a folder called "Headers" and that folder is in the QB64 parent directory, the declare can look like this:
DECLARE LIBRARY ".\Headers\headername". Also, since you put the headers in the other header folders, you shouldn't use the absolute paths anyways. Just get rid of everything in the path up until the first subfolder of the QB64 parent directory.
For instance:
DECLARE LIBRARY ".\internal\c\c_compiler\x86_64-w64-mingw32\include\headername"

However, I always recommend keeping bas and header files with QB64. Not everyone likes that. I prefer it that way.