rbpangolayoutiter.c: In function `layout_iter_copy':
rbpangolayoutiter.c:27: error: invalid application of `sizeof' to incomplete type `/usr/include/pango-1.0/pango/pango-layout.h'
rbpangolayoutiter.c:28: error: dereferencing pointer to incomplete type
rbpangolayoutiter.c:28: error: dereferencing pointer to incomplete type