[Avr-eclipse-user] Header files not found in referenced project

[Art K. <art...@gm...>]

(Originally posted on the SF forum, but that's not very active.)

I'm not clear whether this is an avr-eclipse issue or a CDT issue.

I'm running avr-eclipse 2.4.0.201203041437 in the Helios CDT (build 
20100617-1415) on Win 7 64-bit. I have WinAVR-20100110 installed.

Two projects, call them A and B. A has a set of header files that I want 
to reference in B. I've tried several combinations of specifying A as a 
project and as a directory in B->Properties->C/C++ General->Paths and 
Symbols->Includes and I've also tried both as a path and as a project 
reference in B->Preferences->C/C++ Build->Settings->AVR C 
Compiler->Directories and B->Preferences->C/C++ Build->Settings->AVR C++ 
Compiler->Directories.

No matter what I do, project B is not seeing the header files. In the 
Project Explorer->B->Includes twistie, A shows up (with a project icon) 
but has no contents (the WinAVR include directory shows up just fine.) 
Building B fails with missing header files.

So, how do I get it to recognize these header files?