diff -Naur vmd-1.8.6/configure vmd-1.8.6.new/configure
--- vmd-1.8.6/configure	2007-04-08 01:03:49.000000000 -0400
+++ vmd-1.8.6.new/configure	2008-03-11 09:53:43.000000000 -0400
@@ -591,8 +591,8 @@
 if ($config_tk) { $tcl_include .= " -I$stock_tk_include_dir"; }
 $tcl_library      = "-L$stock_tcl_library_dir";
 if ($config_tk) { $tcl_library .= " -L$stock_tk_library_dir"; }
-$tcl_libs         = "-ltcl8.4";  
-if ($config_tk) { $tcl_libs = "-ltk8.4 -lX11 " . $tcl_libs; }
+$tcl_libs         = "-ltcl";  
+if ($config_tk) { $tcl_libs = "-ltk -lX11 " . $tcl_libs; }
 
 @tcl_cc           = ();
 @tcl_cu           = ();
@@ -1843,8 +1843,8 @@
       $fltk_libs        = "-lfltk-x11 -lX11";
       $opengl_include   = $opengl_include . " -I/usr/X11R6/include";
       $opengl_libs      = "-L/usr/X11R6/lib -lGLU -lGL -framework Carbon -lXext -lX11";
-      $tcl_libs         = "-ltcl8.4-x11";
-      if ($config_tk) { $tcl_libs = "-ltk8.4-x11 -lX11 " . $tcl_libs; }
+      $tcl_libs         = "-ltcl-x11";
+      if ($config_tk) { $tcl_libs = "-ltk-x11 -lX11 " . $tcl_libs; }
       $vmd_libs          = "$tcl_libs";
     } else {
       ##
@@ -1936,8 +1936,8 @@
       $fltk_libs        = "-lfltk-x11 -lX11";
       $opengl_include   = $opengl_include . " -I/usr/X11R6/include";
       $opengl_libs      = "-L/usr/X11R6/lib -lGLU -lGL -framework Carbon -lXext -lX11";
-      $tcl_libs         = "-ltcl8.4-x11";
-      if ($config_tk) { $tcl_libs = "-ltk8.4-x11 -lX11 " . $tcl_libs; }
+      $tcl_libs         = "-ltcl-x11";
+      if ($config_tk) { $tcl_libs = "-ltk-x11 -lX11 " . $tcl_libs; }
       $vmd_libs          = "$tcl_libs";
     } else {
       ##
diff -Naur vmd-1.8.6/src/cmd_render.C vmd-1.8.6.new/src/cmd_render.C
--- vmd-1.8.6/src/cmd_render.C	2007-04-08 01:04:03.000000000 -0400
+++ vmd-1.8.6.new/src/cmd_render.C	2008-03-11 09:53:12.000000000 -0400
@@ -211,8 +211,8 @@
   // likely to lead to memory leaks in various scripts.  There's also currently
   // no way to read out the size of the display in VMD (sad, I know), so
   // it's just easier to set it here.
-  Tk_PhotoSetSize(handle, xs, ys);
-  Tk_PhotoPutBlock(handle, &blk, 0, 0, xs, ys, TK_PHOTO_COMPOSITE_SET);
+  Tk_PhotoSetSize(interp, handle, xs, ys);
+  Tk_PhotoPutBlock(interp, handle, &blk, 0, 0, xs, ys, TK_PHOTO_COMPOSITE_SET);
   free(img);
   return TCL_OK;
 }