Editing an existing library file

Hi, need to edit an existing library. Once changes are made and saved how does arduino ide recognize those changes. I edited the wunderground.h library for my esp8266 weatherstation sketch too try to show temperature on the oled display fahrenheit temperatures but once the sketch is downloaded to the esp device I get the error that library is not found (I did quit and restart arduino ide)

Thanks

I suggest you make a copy of the complete library and give it a different name so you can use either version without getting confused.

IIRC you have to restart the IDE before it sees a new library.

...R

The IDE caches compiled library files. I guess it doesn't bother to check the 'last modified' date on the source files to see if they need to be re-compiled. You should be able to force a re-compile by selecting a different processor and doing a 'verify' build.