-function cvsdiff { cvs diff "$@" 2>&1| less; }; export -f cvsdiff
-function cvsdiffi { cvs diff "$@" 2>&1|grep -v '^?'|less; }; export -f cvsdiffi
-function cvsupdate { cvs update "$@" 2>&1| less; }; export -f cvsupdate
-function cvsupdatei { cvs update "$@" 2>&1|grep -v '^?'|less; }; export -f cvsupdatei
+# even when LANG is set to "en_US" it is lethal - strcoll() starts to sort case-insensitively!
+unset LANG
+
+function cvsdiff { cvs diff "$@" 2>&1|pipebuf -q| less; }; export -f cvsdiff
+function cvsdiffi { cvs diff "$@" 2>&1|pipebuf -q|grep -v '^?'|less; }; export -f cvsdiffi
+function cvsupdate { cvs update "$@" 2>&1|pipebuf -q| less; }; export -f cvsupdate
+function cvsupdatei { cvs update "$@" 2>&1|pipebuf -q|grep -v '^?'|less; }; export -f cvsupdatei