I'm struggling with barrels (debugger can't find sources, breakpoints don't work, etc) and thought using shared files with #include might be easier to deal with.
How is the syntax for #include in Monkey C?
Monkey C is not K&R or ANSI C and does not have a cpp or C pre-processor. If you did everything from the command line, you could theoretically use #include if you manually run a C pre-processor, this this not not something that Monkey C itself supports.