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  • Are the source code block lines above the only text in the org file? Note that you can explicitly enable and disable a programming language in org-babel-load-languages. Double-check that Activated is really on for C! Is the value of org-babel-C-compiler meaningful on your system? Commented Oct 6, 2017 at 20:08
  • @Tobias Yes, the Org file only contains the hello world code block. (eval org-babel-C-compiler) gives gcc. I'm not sure what Activated is? (eval org-babel-load-languages) gives Invalid function: (C . t). Commented Oct 6, 2017 at 20:38
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    See that orgmode-ticket: github.com/syl20bnr/spacemacs/issues/7641. There they say that removing all the compiled files *.elc and byte-compiling the sources does the trick. Commented Oct 9, 2017 at 12:59
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    Possible duplicate of: emacs.stackexchange.com/questions/28441/… Commented Oct 9, 2017 at 13:01
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    The fix was to do rm ~/.emacs/elpa/org-20171009/*.elc and then restart Emacs. The overall issues seems to be an inconsistency between Org mode versions. Very annoying that updating/installing Org does not automatically rebuild the *.elc files :( Commented Oct 10, 2017 at 2:00