diff --git a/tcl.spec b/tcl.spec
index 2fc0bf1..3c90be1 100644
--- a/tcl.spec
+++ b/tcl.spec
@@ -3,7 +3,7 @@
 Summary: Tcl scripting language development environment
 Name: tcl
 Version: %{majorver}.12
-Release: 3.2
+Release: 4
 License: BSD
 Group: Development/Languages
 URL: http://tcl.sourceforge.net/
@@ -75,7 +75,7 @@ autoconf
 
 %build
 cd %{name}%{version}/unix
-%configure
+%configure --enable-threads
 make %{?_smp_mflags} TCL_LIBRARY=%{_datadir}/%{name}%{majorver}
 
 # run "make test" by default
@@ -150,6 +150,9 @@ rm -rf $RPM_BUILD_ROOT
 %doc %{name}%{version}/html/*
 
 %changelog
+* Fri Feb 17 2006 David Cantrell <dcantrell@redhat.com> - 8.4.12-4
+- Enable threads (#181871)
+
 * Fri Feb 10 2006 Jesse Keating <jkeating@redhat.com> - 8.4.12-3.2
 - bump again for double-long bug on ppc(64)