diff -ru rrdtool-1.2.23~/configure.ac rrdtool-1.2.23/configure.ac
--- rrdtool-1.2.23~/configure.ac	2007-05-05 17:17:33.000000000 +0200
+++ rrdtool-1.2.23/configure.ac	2007-05-05 17:18:08.000000000 +0200
@@ -559,7 +559,7 @@
         AC_MSG_WARN([tclConfig.sh not found - Tcl interface won't be built])
   else
 	. $tcl_config
-	TCL_PACKAGE_DIR="$TCL_PACKAGE_PATH/tclrrd$VERSION"
+	TCL_PACKAGE_DIR="${TCL_PACKAGE_PATH% *}/tclrrd$VERSION"
   fi
   AC_ARG_ENABLE(tcl,[  --enable-tcl-site        install the tcl extension in the tcl tree],
   [],[enable_tcl_site=yes])