oraenv not found

In my ksh script I am dynamically setting ORACLE_HOME using

#!/bin/ksh
ORAENV_ASK=NO
export ORACLE_SID=$1
. oraenv
export ORACLE_HOME

When I run the script manually, everything works as expected, but when I schedule it via crontab, I get an error "oraenv not found in /home/oracle" in line . oraenv

What would be the best solution, write out the full path to oraenv 9. /etc/oraenv) or add oraenv path to PATH variable?

Would either of these suffice?

Also oraenv is not found in /etc for some reason. i tried searching for it using

find / -name oraenv -print