They're trying to compile Marlin. Marlin is a popular 3D printer firmware that's written as an Arduino sketch.
Evidently they have resolved the library installation problem and are now dealing with another issue, which is likely caused by an incorrect configuration. Marlin has a file Configuration.h and another Configuration_adv.h which contain a ton of #define directives used to configure the firmware for the specific 3D printer it will be used on. Some of these #defines can simply be commented/uncommented to turn the feature on/off, others have a value that can be adjusted.
randywhite30:
I get the error below when trying to compile the pachage from this forum
Community Favorite - Marlin 1.1.7 Release for Robo R1, R1+PLUS & Variants | ROBO 3D User Forum
There are multiple versions available for download from that link. Which one did you download? Also, it's a 21 page thread. Likely any problem you're having has already been discussed there. Did you search through the thread for the error you're encountering?