glib in redhat 7.3

[Harry Putnam]

Setup: Redhat Linux 7.3
glib-1.2.10 installed

Attempting to compile xfce-3.8.16

I get this error message at ./configure

[...]
 checking for glib-config... no
 checking for GLIB - version >= 1.2.6... no
 *** The glib-config script installed by GLIB could not be found
 *** If GLIB was installed in PREFIX, make sure PREFIX/bin is in
 *** your path, or set the GLIB_CONFIG environment variable to the
 *** full path to glib-config.

What do I need to do to resolve this?

I've set the recommended GLIB_CONFIG var to the exact path:

  [root # ls -l /usr/bin/glib-config 
  -rwxr-xr-x 1 root root 1743 Jul 21 2001 /usr/bin/glib-config]

And run ./configure like this:
GLIB_CONFIG=/usr/bin/glib_config;export GLIB_CONFIG;./configure

Still seems to be looking for a different version or failing anyway.

[...]
checking for glib-config... /usr/bin/glib-config
checking for GLIB - version >= 1.2.6... ./configure: line 1: /usr/bin/glib-config: No such file or directory
./configure: line 1: /usr/bin/glib-config: No such file or directory
./configure: line 1: /usr/bin/glib-config: No such file or directory
./configure: line 1: /usr/bin/glib-config: No such file or directory
./configure: line 1: /usr/bin/glib-config: No such file or directory
no
*** Could not run GLIB test program, checking why...
*** The test program failed to compile or link. See the file config.log for the
*** exact error that occured. This usually means GLIB was incorrectly installed
*** or that you have moved GLIB since it was installed. In the latter case, you
*** may want to edit the glib-config script: /usr/bin/glib-config

I couldn't really figure out from the output in config.log:
[...]
  checking for dirent.h that defines DIR... yes
  checking for opendir in -ldir... no
  checking for an ANSI C-conforming const... (cached) yes
  checking for inline... (cached) inline
  checking whether time.h and sys/time.h may both be included... yes
  checking for X... libraries /usr/X11R6/lib, headers /usr/X11R6/include
  checking for gethostbyname... yes
  checking for connect... yes
  checking for remove... yes
  checking for shmat... yes
  checking for IceConnectionNumber in -lICE... yes
  checking return type of signal handlers... void
  checking for wait3... yes
  checking for wait4... yes
  checking for waitpid... yes
  checking for snprintf... yes
  checking for vsnprintf... yes
  checking for strcasecmp... (cached) yes
  checking for strncasecmp... yes
  main ()
  {
   return ((glib_major_version) || (glib_minor_version) || (glib_micro_version));
    ;
    return 0;
  }
  configure:11923: error: Cannot find GLIB: Is glib-config in path?