Possible fix for :includes header argument in org-babel C source blocks

[Brandon Guttersohn]

Hey all, I think I may have a small fix for executing C source blocks in org-babel. Or, possibly just a bad case of user error.

The issue (in emacs 27 with -q) is that it doesn't seem possible to specify non-system header files with the :includes header argument.

For example; while the following line:

    #+BEGIN_SRC C :includes <example.h>

...produces reasonable code...

    #include <example.h>

...all of the following lines...

    #+BEGIN_SRC C :includes example.h
    #+BEGIN_SRC C :includes "example.h"
    #+BEGIN_SRC C :includes "\"example.h\""

...just result in this...

    #include example.h

...rather than this...

    #include "example.h"

The attached patch will wrap filenames in quotes if they do not begin with "<", and works for me.

Is this a reasonable fix, or maybe I'm misusing the feature?

0001-Fix-support-for-non-system-C-include-directives-in-o.patch
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