gtk+-1.2.1 refuses to ./configure on Linux

[ron flory <rjflory feist com>]

hi-

 On a RedHat x86 5.2 based machine (2.2.4-ac1 kernel) I built glib-1.2.1
configured with:

  ./configure --prefix=/usr/local/glib-1.2.1

 since I don't want to clobber current setups.  this works fine.

 Now, when I go to build gtk 1.2.1 I use the same ./configure (just like
when building gcc, etc), AND I setup the GLIB_CONFIG env var to point to
the glib-config script.

 the compile craps out regardless of how creative I am at telling it
where the files are:

   ./configure --prefix=/usr/local/glib-1.2.1

config.log:
   configure:4670: checking for glib-config
   configure:4705: checking for GLIB - version >= 1.2.1
   configure:4804: gcc -o conftest -g -O2 -Wall    conftest.c   1>&5
   In file included from configure:4730:
   /usr/include/glib.h:22: glibconfig.h: No such file or directory
   configure: failed program was:
   #line 4728 "configure"

     etc...

 using both --prefix and --exec-prefix was no better.

 ok, so whats the trick guys ?

 Thanks-

ron