How do you tell Arduino where to find header files?

[asincos]

After reinstalling my OS, my old project no longer compiles. It requires LiquidCrystal, however, this has been installed by the built-in library manager. I can see that the header files exist under /home/user/Arduino/libraries/LiquidCrystal, yet, the compiler cannot find the .h files it needs.

Yes, I am including it with <>, not "".

I don't seem to find any obvious preferences or settings in the IDE that would tell the compiler what folders to include when looking for header files.

[missdrew]

Hi - can you supply a link to 'Arduino Studio' please.

[asincos]

That should have been just "Arduino", sorry.

[SteveMann]

You can put the complete path to the library in quotes.
If you turn on verbose output, you can see where the IDE is looking for libraries.

[johnwasser]

@asincos

/home/user/Arduino/libraries/LiquidCrystal,

Is that third-party library different from the built-in "LiquidCrystal" library?

[ec2021]

@asincos

/home/user/Arduino/libraries/

Please check in "preferences" that your sketchbook location points to "/home/user/Arduino" where it reads"C:\Users\steve\Documents\Arduino" in this screenshot:

Usually the IDE looks into the libraries folder in this directory but also in the pre-installed libs in the program folder (e.g.: C:\Program Files (x86)\Arduino\libraries)