From mboxrd@z Thu Jan  1 00:00:00 1970
From: Danny Milosavljevic <dannym@scratchpost.org>
Subject: Re: [PATCH 2/5] gnu: Add avr-gcc.
Date: Mon, 15 Aug 2016 15:24:10 +0200
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To: "Thompson, David" <dthompson2@worcester.edu>
Cc: guix-devel <guix-devel@gnu.org>

> I don't know what has changed since I got things working, but I can no
> longer compile that firmware.  I get errors like this:
> 
>     main.c:38:20: fatal error: avr/io.h: No such file or directory

There was a change in cross-base. We don't use CROSS_CPATH anymore. However, avr-gcc does use it (and shouldn't).

(define* (cross-gcc ...
...
    ;; Only search target inputs, not host inputs.
    ;; Note: See <http://bugs.gnu.org/22186> for why not 'CPATH'.
    (search-paths
     (list (search-path-specification
            (variable "CROSS_C_INCLUDE_PATH")
            (files '("include")))
           (search-path-specification
            (variable "CROSS_CPLUS_INCLUDE_PATH")
            (files '("include")))
           (search-path-specification
            (variable "CROSS_OBJC_INCLUDE_PATH")
            (files '("include")))
           (search-path-specification
            (variable "CROSS_OBJCPLUS_INCLUDE_PATH")
            (files '("include")))
           (search-path-specification
            (variable "CROSS_LIBRARY_PATH")
            (files '("lib" "lib64")))))
    (native-search-paths '())))