OracleDatabase HEALTHCHECK Unknown flag: start-period

CentOs 7.4 with docker version 1.12.6, build 85d7426/1.12.6
`./buildDockerImage.sh -v 12.1.0.2 -s -i`
results in 
```Step 16 : HEALTHCHECK --interval=1m --start-period=5m CMD "$ORACLE_BASE/$CHECK_DB_FILE" >/dev/null || exit 1
Unknown flag: start-period
There was an error building the image.
```