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Topic: How to make sure an INCLUDEd sketch gets found (Read 84 times) previous topic - next topic


I'm helping a young man get started with Arduino.  He is a Mac user, I'm Windows.  The kit that he has comes with a load of sketches all of which include an "#include <Elab.h>    // to include needed functions from eLab Peers library " command. So when he tries to do a download, it fails because Elab.h can't be found.  He can find it on his computer and I can find it on mine so the question is where should it be on a Mac?
Thanks in advance for your help and please bear in mind that I speak Windows and C but don't speak Mac!


When you see a "No such file or directory" error it almost always means you need to install the library that contains the missing file.

Often the code you're compiling will come with documentation (either a comment or separate document) that tells you where to get the library dependencies.

Note that libraries may have dependencies on other libraries.

In other cases the author of the code will not have been so kind and you'll need to go on a hunt for the missing library.

A good place to start is the Arduino IDE's Library Manager:
  • Sketch > Include Library > Manage Libraries...
  • In the "Filter your search..." box, type some keywords you have gleaned from the missing file name.
  • Scroll through the results for the right library. Click on it.
  • Click "Install".
  • Wait for installation to finish.
  • Click "Close".
  • Try compiling your code again.

If you have no luck in Library Manager then load up your favorite search engine and do a search for the missing filename. You will often get multiple results. If you have a lot of results you might add "arduino" as an additional search keyword. I will usually prefer results on github.com since that is where most Arduino libraries are hosted and downloading from there is fast and easy. In some cases there will be multiple libraries that contain the given filename and you'll need to do some evaluation to determine which seems the most appropriate, then try it out. After downloading the library you found you'll need to install it. This requires a different process than the Library Manager installation. You will find instructions here:


Thank you!  That makes a huge amount of sense - I can see Elab.h in the pulldown menu you mentioned (if I pull it down a bit). I will get him to give it a crack.


You're welcome. I'm glad if I was able to be of assistance. Enjoy!

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