makefile changes ignored

[angelo]

Dear all,

i am having a very strange issue with make on OSX Leopard. This issue 
anyway is probably related to the operative system someway, but i try to 
explain.

Problem happen actually with GNU-Make 3.79.1 or 3.81

I have a Makefile with a target. Doing changes on it and executing again 
"make target" generally works.
Some time, for some unknown reason, generally after an error while 
making is happen, any further changes on the makefile are ignored from 
make,
and i still get the previous  make output, like if i didn't make any 
changes on the makefile.

I try to reboot, the makefile is modified, but i still get the old 
output, before the makefile was modified.

It seems that the old Makefile is cached someway and is still used 
instead of the new.

Thanks in advice.


Angelo