undefined reference to 'yylex'

Hello

I'm trying to compile XFree86 3.3.6 on a SuSE 8.1 (kernel 2.4.19) but 
get the following compile errors:

[...]
In file included from connection.c:79:
/usr/include/stdlib.h:699: parse error before "int"
make[4]: *** [connection.o] Error 1
make[4]: Leaving directory /usr/XFree86/3.3.6/source/xc/programs/xfs/os`
make[3]: *** [os] Error 2
[...]

Hard to imagine there's something wrong with the stdlib.h, so what else 
could it be? I didn't tamper with the sources...


[...]
/usr/lib/gcc-lib/i486-suse-linux/3.2/../../../../i486-suse-linux/bin/ld: 
cannot find -ltk
collect2: ld returned 1 exit status
make[5]: *** [XF86Setup] Error 1
[...]

I'm using tk/tcl-8.4-48 while xf86site.def suggests to be using tk-4.0 
and Tcl-7.4. Might that be a problem?

Also I'm using gcc-3.2-36.... if that makes any difference.

I'd appreciate any help to get 3.3.6 running on my machine.

Thanks
Stefan