Issue #21683: Add Tix build to the Windows buildbot scripts.
diff --git a/Tools/buildbot/external-amd64.bat b/Tools/buildbot/external-amd64.bat
index c32726d..9905989 100644
--- a/Tools/buildbot/external-amd64.bat
+++ b/Tools/buildbot/external-amd64.bat
@@ -18,3 +18,11 @@
     nmake -f makefile.vc COMPILERFLAGS=-DWINVER=0x0500 OPTS=noxp DEBUG=1 MACHINE=AMD64 INSTALLDIR=..\..\tcltk64 TCLDIR=..\..\tcl-8.5.15.0 install
     cd ..\..
 )
+
+if not exist tcltk64\lib\tix8.4.3\tix84g.dll (
+    cd tix-8.4.3.5\win
+    nmake -f python.mak DEBUG=1 MACHINE=AMD64 COMPILERFLAGS=-DWINVER=0x0500 TCL_DIR=..\..\tcl-8.5.15.0 TK_DIR=..\..\tk-8.5.15.0 INSTALL_DIR=..\..\tcltk64 clean
+    nmake -f python.mak DEBUG=1 MACHINE=AMD64 COMPILERFLAGS=-DWINVER=0x0500 TCL_DIR=..\..\tcl-8.5.15.0 TK_DIR=..\..\tk-8.5.15.0 INSTALL_DIR=..\..\tcltk64 all
+    nmake -f python.mak DEBUG=1 MACHINE=AMD64 COMPILERFLAGS=-DWINVER=0x0500 TCL_DIR=..\..\tcl-8.5.15.0 TK_DIR=..\..\tk-8.5.15.0 INSTALL_DIR=..\..\tcltk64 install
+    cd ..\..
+)
\ No newline at end of file
diff --git a/Tools/buildbot/external-common.bat b/Tools/buildbot/external-common.bat
index 8453dcb..319ef15 100644
--- a/Tools/buildbot/external-common.bat
+++ b/Tools/buildbot/external-common.bat
@@ -17,6 +17,7 @@
 @rem if exist tk-8.4.18.1 rd /s/q tk-8.4.18.1
 @rem if exist tk-8.5.2.0 rd /s/q tk-8.5.2.0
 @rem if exist tk-8.5.15.0 rd /s/q tk-8.5.15.0
+@rem if exist tix-8.4.3.5 rd /s/q tix-8.4.3.5
 @rem if exist db-4.4.20 rd /s/q db-4.4.20
 @rem if exist db-4.7.25.0 rd /s/q db-4.7.25.0
 @rem if exist openssl-0.9.8y rd /s/q openssl-0.9.8y
@@ -44,6 +45,7 @@
    svn export http://svn.python.org/projects/external/tcl-8.5.15.0
 )
 if not exist tk-8.5.15.0 svn export http://svn.python.org/projects/external/tk-8.5.15.0
+if not exist tix-8.4.3.5 svn export http://svn.python.org/projects/external/tix-8.4.3.5
 
 @rem sqlite3
 if not exist sqlite-3.6.21 (
diff --git a/Tools/buildbot/external.bat b/Tools/buildbot/external.bat
index e7fb393..136a396 100644
--- a/Tools/buildbot/external.bat
+++ b/Tools/buildbot/external.bat
@@ -19,3 +19,11 @@
     nmake -f makefile.vc COMPILERFLAGS=-DWINVER=0x0500 OPTS=noxp DEBUG=1 INSTALLDIR=..\..\tcltk TCLDIR=..\..\tcl-8.5.15.0 install
     cd ..\..
 )
+
+if not exist tcltk\lib\tix8.4.3\tix84g.dll (
+    cd tix-8.4.3.5\win
+    nmake -f python.mak DEBUG=1 MACHINE=IX86 COMPILERFLAGS=-DWINVER=0x0500 TCL_DIR=..\..\tcl-8.5.15.0 TK_DIR=..\..\tk-8.5.15.0 INSTALL_DIR=..\..\tcltk clean
+    nmake -f python.mak DEBUG=1 MACHINE=IX86 COMPILERFLAGS=-DWINVER=0x0500 TCL_DIR=..\..\tcl-8.5.15.0 TK_DIR=..\..\tk-8.5.15.0 INSTALL_DIR=..\..\tcltk all
+    nmake -f python.mak DEBUG=1 MACHINE=IX86 COMPILERFLAGS=-DWINVER=0x0500 TCL_DIR=..\..\tcl-8.5.15.0 TK_DIR=..\..\tk-8.5.15.0 INSTALL_DIR=..\..\tcltk install
+    cd ..\..
+)