GTK configure does not find X?

["HEITMEIER, MICHAEL (HP-Germany,ex1)" <michael_heitmeier bbn exch hp com>]

Trying to install GTK 1.2.6 on FreeBSD 3.2 and Xfree 3.3.5 the configure
script fails, claiming it cannot find X. Strange that, given I run this from
within X...
I hope the attached excerpt from config.log helps to troubleshoot this
issue, Maybe the check whether X exists is somehow faulty?

Thanks for your help,

Michael
michael_heitmeier@hp.com <mailto:michael_heitmeier@hp.com> 


The last entries from config.log:
configure:4525: checking for X
configure:4592: gcc -E  conftest.c >/dev/null 2>conftest.out
configure:4588: X11/Intrinsic.h: No such file or directory
configure: failed program was:
#line 4587 "configure"
#include "confdefs.h"
#include <X11/Intrinsic.h>
configure:4668: gcc -o conftest -g -O2 -Wall   conftest.c -lXt   1>&5
configure: In function `main':
configure:4664: warning: implicit declaration of function `XtMalloc'
/usr/libexec/elf/ld: cannot open -lXt: No such file or directory
configure: failed program was:
#line 4661 "configure"
#include "confdefs.h"

int main() {
XtMalloc()
; return 0; }