[plt-scheme] stddef.h problem - building from SVN on Ubuntu 8.10 AMD64

This seems to be a new problem since my upgrade to Ubuntu 8.10:

[...]
make[7]: Entering directory `/home/gknauth/test/plt/plt/src/foreign'
/home/gknauth/test/plt/plt/src/lt/libtool --mode=compile --tag=CC gcc - 
g -O2  -Wall -DMZ_USES_SHARED_LIB -I./../mzscheme -I./../mzscheme/ 
include -I./../mzscheme/src -Igcc/libffi/include -c ./foreign.c -o  
foreign.lo
mkdir .libs
  gcc -g -O2 -Wall -DMZ_USES_SHARED_LIB -I./../mzscheme -I./../ 
mzscheme/include -I./../mzscheme/src -Igcc/libffi/include -c ./ 
foreign.c  -fPIC -DPIC -o .libs/foreign.o
In file included from ./../mzscheme/include/scheme.h:127,
                  from ./../mzscheme/src/schpriv.h:21,
                  from ./foreign.c:12:
/usr/include/stdio.h:34:21: error: stddef.h: No such file or directory
In file included from /usr/include/stdio.h:75,
                  from ./../mzscheme/include/scheme.h:127,
                  from ./../mzscheme/src/schpriv.h:21,
                  from ./foreign.c:12:

I don't think it's a PLT problem.  I've googled enough to see non-PLT  
folks are having similar difficulties.  I'm just wondering if anyone  
has seen this before building PLT on Ubuntu 8.10.

I have build-essential, libc6, libc6-dev installed, and I can even see  
stddef.h under various gcc subdirectories, just apparently not where  
gcc is looking.

Geoffrey

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.racket-lang.org/users/archive/attachments/20090122/999b8f15/attachment.html>