pgadmin3 bombs with a relocation error when using postgresql 8.4

[Shavais]

I'm using CentOS 5..

Linux localhost.localdomain 2.6.18-238.9.1.el5 #1 SMP Tue Apr 12
18:10:13 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux

I'm using pgdg-84-centos.repo, to get postgresql 8.4 (I need to run
8.4 right now, because that's the rev the app I work on uses and
supports right now), and I have rpmforge.repo enabled.

After installing postgresql, postgresql-server, postgresql-contrib,
postgresql-libs, and pgadmin3, when I try to run pgadmin3, I get this
error:

pgadmin3: relocation error: pgadmin3: symbol
_ZN12wxStringBase8InitWithEPKwmm, version WXU_2.8 not defined in file
libwx_baseu-2.8.so.0 with link time reference

I tried compiling various versions of the pgadmin3 source, but they
each require pg_config, which apparently is not a part of any of the
8.4 packages.

Any help would sure be appreciated.

-Shavais