diff --git a/cvs.sh b/cvs.sh
index 46bd62e..cf88996 100644
--- a/cvs.sh
+++ b/cvs.sh
@@ -32,7 +32,7 @@ check_autotool_versions()
 required_autoconf_version="2.53 or newer"
 AUTOCONF_VERSION=`$AUTOCONF --version | head -n 1`
 case $AUTOCONF_VERSION in
-  Autoconf*2.5* | autoconf*2.5* | autoconf*2.6* ) : ;;
+  Autoconf*2.5* | autoconf*2.[567]* ) : ;;
   "" )
     echo "*** AUTOCONF NOT FOUND!."
     echo "*** TDE requires autoconf $required_autoconf_version"
@@ -47,7 +47,7 @@ esac
 
 AUTOHEADER_VERSION=`$AUTOHEADER --version | head -n 1`
 case $AUTOHEADER_VERSION in
-  Autoconf*2.5* | autoheader*2.5* | autoheader*2.6* ) : ;;
+  Autoconf*2.5* | autoheader*2.[567]* ) : ;;
   "" )
     echo "*** AUTOHEADER NOT FOUND!."
     echo "*** TDE requires autoheader $required_autoconf_version"