From Gerben's link to the googlegroups's thread, Delta robot 3D printers › compiling jcrocholl's Marlin (Ubuntu), as Francis Mallet points out, at the bottom of the thread, it is necessary to change
I copied the content of the Time library right in the Marlin folder, then changed line 7 of qr_solve.cpp from #include to #include "Time.h"
The code compiled and everything seems to be working ok.
So, to iterate, the line in
Marlin.ino should compile as expected.
Note that the latest version of Marlin, from github.com/MarlinFirmware/Marlin no longer suffers from this issue, but older versions of the software, such as github.com/gpfwestie/kossel_2020_sintron will do, due to line 7, in