[R] No rule to make target 'R/Copy'

[Ardia David]

Dear all,
I am currently building  a package with C code (in scr folder). 
Everything was ok, but now, I get the following error message when 
compiling the package using R CMD INSTALL:
make[2]: *** No rule to make target 'R/Copy', needed in [...]
What does that mean? I can still compile other packages containing C 
code, but not that one. No 00UNLOCK directory has been created . I am on 
a IBM PC, and use windows XP.
Thanks for your help
-- 
David Ardia
H-building, room 11-26
Econometric Institute
Erasmus University
PO Box 1738
NL 3000 DR Rotterdam
The Netherlands
Phone: +31 (0)10 408 2269