mysql_secure_installation can't find "mysql" in basedir

[gmontee@localhost mariadb-10.1.5-linux-x86_64]$ ./bin/mysql_secure_installation -u root --basedir=/tmp/mariadb-10.1.5-linux-x86_64/

print: /tmp/mariadb-10.1.5-linux-x86_64//bin/my_print_defaults

FATAL ERROR: Could not find mysql

The following directories were searched:

/tmp/mariadb-10.1.5-linux-x86_64//bin

If you compiled from source, you need to run 'make install' to

copy the software into the correct location ready for operation.

If you are using a binary release, you must either be at the top

level of the extracted archive, or pass the --basedir option

pointing to that location.

[gmontee@localhost mariadb-10.1.5-linux-x86_64]$ export PATH=$PATH:/tmp/mariadb-10.1.5-linux-x86_64/bin

[gmontee@localhost mariadb-10.1.5-linux-x86_64]$ ./bin/mysql_secure_installation -u root --basedir=/tmp/mariadb-10.1.5-linux-x86_64/

print: /tmp/mariadb-10.1.5-linux-x86_64//bin/my_print_defaults

NOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDB

SERVERS IN PRODUCTION USE! PLEASE READ EACH STEP CAREFULLY!

In order to log into MariaDB to secure it, we'll need the current

password for the root user. If you've just installed MariaDB, and

you haven't set the root password yet, the password will be blank,

so you should just press enter here.

Enter current password for root (enter for none):