Using timer interrupts in a library

Projects Programming
16

Then I get

In file included from RCXIR_Test.ino:2:
C:\Users\Family\Dropbox\Matt's Technology\Arduino\Sketch Book\libraries\RCXIR/RCXIR.h:17:18: error: FIFO.h: No such file or directory
In file included from RCXIR_Test.ino:2:
C:\Users\Family\Dropbox\Matt's Technology\Arduino\Sketch Book\libraries\RCXIR/RCXIR.h:30: error: 'FIFOClass' does not name a type