update

build-avr-libc

@@ -4,6 +4,12 @@
 
 # Stop on errors
 set -e
+if ! [ -x "$(command -v avr-gcc)" ]
+then
+echo "Need to build avr-gcc first !"
+exit
+fi
+
 if [ ! -f .prereq ];then ./prerequise.sh;fi
 
 source avr-file-names