Version is assumed to be 1.0rc3 - Got the sources today from 
http://www.xiph.org/ogg/vorbis/download/

The file libvorbis/lib/lookup_data.h contains the following define
    #define INVSQ2EXP_LOOKUP_MIN -32

This is used later in libvorbis/lib/lookup.c like this
    return INVSQ2EXP_LOOKUP[a-INVSQ2EXP_LOOKUP_MIN];

Note the missing space between 'a-' and the macro.

On my HP/PA-RISC, with the native compiler this causes an syntax error.
The expansion of the code above is

      a--32

This is at least ambiguous: 'a-- 32' vs 'a- -32', and the first interpreation
truly is a syntax error.

Best solution: Change the define to
    #define INVSQ2EXP_LOOKUP_MIN (-32)

The parentheses prevent any misinterpretation of the value.