VPATH problem (make fails first time but succeeds second time)

[Li Dong]

Dear all,

I have encountered a problem with VPATH (details are in 
http://stackoverflow.com/questions/17790125/make-implicit-rule-fails-at-first-time-but-succeeds-at-second-time),
 and I have searched out for information and got:

If a target needs to be rebuilt, GNU make discards the file name found during 
the VPATH search for this target, and builds the file locally using the file 
name given in the makefile. If a target does not need to be rebuilt, GNU make 
uses the file name found during the VPATH search.

How could I tell make not to discard the file name? And I have tried GPATH, but 
it is worse. Any idea?

Best regards,

Li