I can confirm this bug (on an schroot build system of sid). However, I'm not sure sure it is a missing dependency: The file doc/api/latex_pdf_src/refman.pdf gets built and looks fine. I haven't hunted further, me not being a make expert...
Steps to reproduce: 1) (enter clean chroot system) 2) apt-get build-dep avr-libc 3) apt-get source avr-libc 4) cd avr-libc-1.4.6 5) dpkg-buildpackage -rfakeroot -uc -us -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]