Error verily ad compile Marlin

I have a i3 prusa printer. I just installed the new Arduino ide 1.82 to my board. I have tried to upload, verily and compile Marlin 1.0, but I get and error message, ( using typedef- name'fpos_t' after 'struct') How do I fix this? board mega 2580
Ed

This question has been answered many many times....

one last time.

"Renaming fpos_t variables in SdBaseFile.h and SdBaseFile.cpp to another name like filepos_t fixes it fully.

The issue is that old versions of marlin used the variable name fpos_t but newer version of Arduino grabbed this name as a reserved structure causing the old marlin to fail to compile."