thunderbird-2.0.0.21 build failure

[Thomas Klausner <wiz%NetBSD.org@localhost>]

With -j2 on amd64/5.99.11:

Creating .deps
make[6]: Entering directory 
`/scratch/mail/thunderbird/work/mozilla/xpcom/typelib/xpt/src'
xpt_arena.c
cc -o xpt_arena.o -c  -DOSTYPE=\"NetBSD5.99\" -DOSARCH=\"NetBSD\" 
-DBUILD_ID=0000000000 -DEXPORT_XPT_API   -I../../../../dist/include/xpcom 
-I../../../../dist/include -I../../../../dist/include/nspr -I/usr/pkg/include 
-I/usr/pkg/include  -I../../../../dist/sdk/include    -fPIC -DPIC 
-DSQLITE_THREAD_OVERRIDE_LOCK=0 -I/usr/pkg/include -I/usr/include 
-I/usr/pkg/include/freetype2  -Wall -W -Wno-unused -Wpointer-arith -Wcast-align 
-Wno-long-long -O2 -I/usr/pkg/include -I/usr/include 
-I/usr/pkg/include/freetype2 -Dunix -pthread -pipe  -DNDEBUG -DTRIMMED -O2  
-DSQLITE_THREAD_OVERRIDE_LOCK=0 -I/usr/pkg/include -I/usr/include 
-I/usr/pkg/include/freetype2  -include ../../../../mozilla-config.h 
-DMOZILLA_CLIENT -Wp,-MD,.deps/xpt_arena.pp xpt_arena.c
xpt_struct.c
cc -o xpt_struct.o -c  -DOSTYPE=\"NetBSD5.99\" -DOSARCH=\"NetBSD\" 
-DBUILD_ID=0000000000 -DEXPORT_XPT_API   -I../../../../dist/include/xpcom 
-I../../../../dist/include -I../../../../dist/include/nspr -I/usr/pkg/include 
-I/usr/pkg/include  -I../../../../dist/sdk/include    -fPIC -DPIC 
-DSQLITE_THREAD_OVERRIDE_LOCK=0 -I/usr/pkg/include -I/usr/include 
-I/usr/pkg/include/freetype2  -Wall -W -Wno-unused -Wpointer-arith -Wcast-align 
-Wno-long-long -O2 -I/usr/pkg/include -I/usr/include 
-I/usr/pkg/include/freetype2 -Dunix -pthread -pipe  -DNDEBUG -DTRIMMED -O2  
-DSQLITE_THREAD_OVERRIDE_LOCK=0 -I/usr/pkg/include -I/usr/include 
-I/usr/pkg/include/freetype2  -include ../../../../mozilla-config.h 
-DMOZILLA_CLIENT -Wp,-MD,.deps/xpt_struct.pp xpt_struct.c
xpt_arena.c:46:23: error: xpt_arena.h: No such file or directory
xpt_arena.c:119: error: expected specifier-qualifier-list before 'PRUint8'
xpt_arena.c:136: error: expected ')' before '*' token
xpt_arena.c:169: warning: return type defaults to 'int'
xpt_arena.c: In function 'XPT_PUBLIC_API':
xpt_arena.c:169: error: expected declaration specifiers before 
'XPT_DestroyArena'
xpt_arena.c:183: error: expected declaration specifiers before 'XPT_PUBLIC_API'
xpt_arena.c:195: error: expected declaration specifiers before 'XPT_PUBLIC_API'
xpt_arena.c:268: error: expected declaration specifiers before 'XPT_PUBLIC_API'
xpt_arena.c:283: error: expected declaration specifiers before 'XPT_PUBLIC_API'
xpt_arena.c:293: error: expected declaration specifiers before 'XPT_PUBLIC_API'
xpt_arena.c:297: error: expected '{' at end of input
make[6]: *** [xpt_arena.o] Error 1
make[6]: *** Waiting for unfinished jobs....
xpt_struct.c:40:21: error: xpt_xdr.h: No such file or directory
xpt_struct.c:41:24: error: xpt_struct.h: No such file or directory

Anyone know how to fix this?
 Thomas