Makefile question

[Daniel Santos]

Hello,

I have the following project structure :

Proj1, Proj1.1, and Proj1.2. Like in book chapters. Proj1.1 is a 
library, and I want to use it in proj 1.2.
To include the headers and the shared objects I add the path to Proj1.1 
in the Proj1.2 GNUmakefile.preamble under the ADDITIONAL_INCLUDE_DIRS 
variable, and analogously for the ADDITIONAL_LIB_DIRS. I learned this 
from the make manual.

When I make Proj1.2 in Project center, include files in Proj1.1 are not 
being found.

Need help.