Index: utils/installall.sh
==================================================================
--- utils/installall.sh
+++ utils/installall.sh
@@ -37,12 +37,12 @@
 echo 
 echo "Set additional_libpath to help find gtk or other libraries, don't forget a leading :"
 
 SYSTEM_TYPE=$(lsb_release -irs |tr ' ' '_' |tr '\n' '-')$(uname -i)-$OPTION
 
-CHICKEN_VERSION=4.12.0
-CHICKEN_BASEVER=4.12.0
+CHICKEN_VERSION=4.10.0
+CHICKEN_BASEVER=4.10.0
 
 # Set up variables
 #
 case $SYSTEM_TYPE in
 Ubuntu-17.04-x86_64-std)