src/cairo-matrix.c (117) has cairo_matrix_init_identity() which is a void
function but the body has:

return cairo_matrix_init (matrix,
                              1, 0,
                              0, 1,
                              0, 0);
This breaks the build on Solaris with Sun One Studio 8 compiler:
$ cc -V
cc: Sun C 5.5 Patch 112761-06 2004/01/13

I created a local patch that simply removes the 'return' keyword.