Shuf detection doesn't use an env-var.

tcshrc.prompt.defs

@@ -6,7 +6,7 @@ _debug "Sourcing prompt setup and definitions..."
 
 which shuf >& /dev/null
 if( $? == 0 ) then
-    setenv CSHENV_DETECTED_SHUF
+    set cshenv_detected_shuf
 endif
 
 if( ! $?unknown_tty ) then

tcshrc.prompt.final

@@ -78,7 +78,7 @@ while( ${prompt_hcolor} == 0 )
 	_debug colorshuffle
     #echo 
     # Shuffle, if supported
-    if( $?CSHENV_DETECTED_SHUF ) then
+    if( $?cshenv_detected_shuf ) then
         set reference_colors=`shuf -e $reference_colors`
     else
         #echo "FALLBACK COLOR!"
@@ -97,7 +97,7 @@ end
 while( ${prompt_hsym} == 0 )
 	_debug symbolshuffle
     #echo 
-    if( $?CSHENV_DETECTED_SHUF ) then
+    if( $?cshenv_detected_shuf ) then
         set referencechars=`shuf -e $referencechars`
         #set reference_colors=`shuf -e $reference_colors`
     else