On Sun, Nov 28, 2010 at 09:21:40AM +0000, Ian W. Wright wrote:
> I tried to install the Hydra v1.4 firmware but, although the directory
> structure and placement of files seems to be exactly the same as the
> v1.3 firmware, I get a compilation error saying that the compiler
> can't find the library files.

Scanning their website, arduino seems to use avr-gcc "version 4.3.2 or
later", so you should be able to use:

$ avr-gcc -print-search-dirs

to provide a list including the directories in which it is looking for
libraries. On my host, that includes /usr/lib/gcc/avr/4.2.2/
and /usr/lib/gcc/avr/ .

Looking at your list, are your libraries located where the compiler is
looking?

Sorry for being parallel to, rather than in, the arduino mindset, but I
find it more fun to do my own boards, and just use the gnu avr toolchain.

...
> the fact that I've previously uploaded several other sketches to my
> Arduinos ( 1 mega and 1 Dumilanove ) and had them working suggests to
> me that it isn't.

Have you loaded more than one compiler version? That can sometimes be a
very effective way to tie a toolchain knot or two. ;-)

Good luck!

Erik

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