diff --git a/README.md b/README.md
index b43530fb..da8b87a1 100644
--- a/README.md
+++ b/README.md
@@ -67,7 +67,7 @@ work, but these are the versions used for development.
 cmake    3.10.2 3.10.2   3.16.2
 clang    9.1.0           11.0.0
 gcc      3.3.2   7.3.0   
-tcl      8.2     8.6     8.6.6
+tcl      8.4     8.6     8.6.6
 swig     1.3.28  3.0.12  4.0.1
 bison    1.35    3.0.4   3.5
 flex     2.5.4   2.6.4   2.5.35
diff --git a/include/sta/ReportTcl.hh b/include/sta/ReportTcl.hh
index 92260856..ee9167ef 100644
--- a/include/sta/ReportTcl.hh
+++ b/include/sta/ReportTcl.hh
@@ -22,9 +22,12 @@
 
 namespace sta {
 
+// Encapsulate the Tcl stdout and stderr channels to print to the
+// report object so that the output from Tcl puts and errors can be
+// logged and redirected.
+//
 // Output streams that talk to TCL channels.
-// This directs all output on the Report object to tcl stdout and stderr
-// channels.
+// This directs all output on the Report object to the Tcl stdout channel.
 // Tcl output channels are encapsulated to print to the Report object
 // that supports redirection and logging as well as printing to the
 // underlying channel.
diff --git a/util/ReportTcl.cc b/util/ReportTcl.cc
index b7f90cd8..b1e0190f 100644
--- a/util/ReportTcl.cc
+++ b/util/ReportTcl.cc
@@ -31,12 +31,6 @@ using ::Tcl_GetChannelType;
 
 extern "C" {
 
-// Tcl8.4 adds const's to Tcl_ChannelType but earlier versions
-// don't have them.
-#ifndef CONST84
-#define CONST84
-#endif
-
 static int
 encapOutputProc(ClientData instanceData,
                 CONST84 char *buf,
@@ -79,7 +73,6 @@ static int
 encapBlockModeProc(ClientData instanceData, int mode);
 }  // extern "C"
 
-#ifdef TCL_CHANNEL_VERSION_5
 Tcl_ChannelType tcl_encap_type_stdout = {
     const_cast<char *>("file"),
     TCL_CHANNEL_VERSION_4,
@@ -120,160 +113,6 @@ Tcl_ChannelType tcl_encap_type_stderr = {
     nullptr   // truncateProc
 };
 
-#else
-#ifdef TCL_CHANNEL_VERSION_4
-// Tcl 8.4.12
-Tcl_ChannelType tcl_encap_type_stdout = {
-    const_cast<char *>("file"),
-    TCL_CHANNEL_VERSION_4,
-    encapCloseProc,
-    encapInputProc,
-    encapOutputProc,
-    encapSeekProc,
-    encapSetOptionProc,
-    encapGetOptionProc,
-    encapWatchProc,
-    encapGetHandleProc,
-    nullptr,  // close2Proc
-    encapBlockModeProc,
-    nullptr,  // flushProc
-    nullptr,  // handlerProc
-    nullptr,  // wideSeekProc
-    nullptr   // threadActionProc
-};
-
-Tcl_ChannelType tcl_encap_type_stderr = {
-    const_cast<char *>("file"),
-    TCL_CHANNEL_VERSION_4,
-    encapCloseProc,
-    encapInputProc,
-    encapErrorOutputProc,
-    encapSeekProc,
-    encapSetOptionProc,
-    encapGetOptionProc,
-    encapWatchProc,
-    encapGetHandleProc,
-    nullptr,  // close2Proc
-    encapBlockModeProc,
-    nullptr,  // flushProc
-    nullptr,  // handlerProc
-    nullptr,  // wideSeekProc
-    nullptr   // threadActionProc
-};
-
-#else
-#ifdef TCL_CHANNEL_VERSION_3
-// Tcl 8.4
-Tcl_ChannelType tcl_encap_type_stdout = {
-    const_cast<char *>("file"),
-    TCL_CHANNEL_VERSION_3,
-    encapCloseProc,
-    encapInputProc,
-    encapOutputProc,
-    encapSeekProc,
-    encapSetOptionProc,
-    encapGetOptionProc,
-    encapWatchProc,
-    encapGetHandleProc,
-    nullptr,  // close2Proc
-    encapBlockModeProc,
-    nullptr,  // flushProc
-    nullptr,  // handlerProc
-    nullptr   // wideSeekProc
-};
-
-Tcl_ChannelType tcl_encap_type_stderr = {
-    const_cast<char *>("file"),
-    TCL_CHANNEL_VERSION_3,
-    encapCloseProc,
-    encapInputProc,
-    encapErrorOutputProc,
-    encapSeekProc,
-    encapSetOptionProc,
-    encapGetOptionProc,
-    encapWatchProc,
-    encapGetHandleProc,
-    nullptr,  // close2Proc
-    encapBlockModeProc,
-    nullptr,  // flushProc
-    nullptr,  // handlerProc
-    nullptr   // wideSeekProc
-};
-
-#else
-#ifdef TCL_CHANNEL_VERSION_2
-
-// Tcl 8.3.2
-Tcl_ChannelType tcl_encap_type_stdout = {
-    const_cast<char *>("file"),
-    TCL_CHANNEL_VERSION_2,
-    encapCloseProc,
-    encapInputProc,
-    encapOutputProc,
-    encapSeekProc,
-    encapSetOptionProc,
-    encapGetOptionProc,
-    encapWatchProc,
-    encapGetHandleProc,
-    nullptr,  // close2Proc
-    encapBlockModeProc,
-    nullptr,  // flushProc
-    nullptr   // handlerProc
-};
-
-Tcl_ChannelType tcl_encap_type_stderr = {
-    const_cast<char *>("file"),
-    TCL_CHANNEL_VERSION_2,
-    encapCloseProc,
-    encapInputProc,
-    encapErrorOutputProc,
-    encapSeekProc,
-    encapSetOptionProc,
-    encapGetOptionProc,
-    encapWatchProc,
-    encapGetHandleProc,
-    nullptr,  // close2Proc
-    encapBlockModeProc,
-    nullptr,  // flushProc
-    nullptr   // handlerProc
-};
-
-#else
-
-// Tcl 8.2
-Tcl_ChannelType tcl_encap_type_stdout = {
-    const_cast<char *>("file"),
-    encapBlockModeProc,
-    encapCloseProc,
-    encapInputProc,
-    encapOutputProc,
-    encapSeekProc,
-    encapSetOptionProc,
-    encapGetOptionProc,
-    encapWatchProc,
-    encapGetHandleProc,
-    nullptr  // close2Proc
-};
-
-Tcl_ChannelType tcl_encap_type_stderr = {
-    const_cast<char *>("file"),
-    encapBlockModeProc,
-    encapCloseProc,
-    encapInputProc,
-    encapErrorOutputProc,
-    encapSeekProc,
-    encapSetOptionProc,
-    encapGetOptionProc,
-    encapWatchProc,
-    encapGetHandleProc,
-    nullptr  // close2Proc
-};
-
-#endif
-#endif
-#endif
-#endif
-
 ////////////////////////////////////////////////////////////////
 
 ReportTcl::ReportTcl() :
@@ -293,9 +132,6 @@ ReportTcl::~ReportTcl()
   Tcl_UnstackChannel(interp_, tcl_stderr_);
 }
 
-// Encapsulate the Tcl stdout and stderr channels to print to the
-// report object so that the output from Tcl puts and errors can be
-// logged and redirected.
 void
 ReportTcl::setTclInterp(Tcl_Interp *interp)
 {