On my amd64 box I am trying to emerge -uD world and I have the following 
compilation error:

  x86_64-pc-linux-gnu-gcc -DHAVE_CONFIG_H -I. -I../.. -I../.. 
-I../../lib/gvc -I../../lib/pack -I../../lib/fdpgen -I../../lib/pathplan 
-I../../lib/graph -I../../lib/cdt -I/usr/include -pipe -O2 
-Wno-unknown-pragmas -Wstrict-prototypes -Wpointer-arith -Wall 
-ffast-math -c htmllex.c  -fPIC -DPIC -o .libs/htmllex.o
htmllex.c: In function 'characterData':
htmllex.c:550: warning: value computed is not used
htmllex.c: In function 'comp_entities':
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c:635: error: dereferencing pointer to incomplete type
htmllex.c: In function 'scanEntity':
htmllex.c:647: error: storage size of 'key' isn't known
htmllex.c:657: error: 'entities' undeclared (first use in this function)
htmllex.c:657: error: (Each undeclared identifier is reported only once
htmllex.c:657: error: for each function it appears in.)
htmllex.c:657: error: 'NR_OF_ENTITIES' undeclared (first use in this 
function)
htmllex.c:660: error: dereferencing pointer to incomplete type
htmllex.c:647: warning: unused variable 'key'
htmllex.c: In function 'findNext':
htmllex.c:688: warning: value computed is not used
htmllex.c:694: warning: value computed is not used
make[3]: *** [htmllex.lo] Błąd 1
make[3]: Opuszczenie katalogu 
`/var/tmp/portage/media-gfx/graphviz-2.8-r2/work/graphviz-2.8/lib/common'
make[2]: *** [all-recursive] Błąd 1
make[2]: Opuszczenie katalogu 
`/var/tmp/portage/media-gfx/graphviz-2.8-r2/work/graphviz-2.8/lib'
make[1]: *** [all-recursive] Błąd 1
make[1]: Opuszczenie katalogu 
`/var/tmp/portage/media-gfx/graphviz-2.8-r2/work/graphviz-2.8'
make: *** [all] Błąd 2

!!! ERROR: media-gfx/graphviz-2.8-r2 failed.
Call stack:
   ebuild.sh, line 1614:   Called dyn_compile
   ebuild.sh, line 971:   Called qa_call 'src_compile'
   environment, line 3543:   Called src_compile
   graphviz-2.8-r2.ebuild, line 84:   Called die

!!! Compile Failed!
!!! If you need support, post the topmost build error, and the call 
stack if relevant.
!!! A complete build log is located at 
'/var/tmp/portage/media-gfx/graphviz-2.8-r2/temp/build.log'.

karol / #


I am using stable branch.
Regards,
Karol Szkudlarek
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