Crossing directories for target and source

[Erik Rull]

Hi all,

I'm planning to restructure my projects source tree.
Is it possible to write a rule that does the following:

src/*.c compiles all files to build/*.o
AND is capable to find out that one of the *.c ind the src/ has been 
modified. My plan is to run the makefile in the parent directory of both 
src and build.

I'm asking that before starting restructuring because I've heard that make 
seems to have some difficulties crossing directories.

Hints and tipps for solving this part would be helpful.

Thanks.

Best regards,

Erik