dovecot - Nov 2018 - Installing on Mojave, with Homebrew and mysql

I?m using Homebrew to install Dovecot on Mojave, but have to modify the formula
to add ?--with-mysql?.

Unfortunately compiling always fails with:

checking for mysql_config... NO
checking for mysql_init in -lmysqlclient... no
configure: error: Can't build with MySQL support: libmysqlclient not found

I added:

 ENV['LD']="-L/usr/local/opt/mysql at 5.7/lib"

to the ?def install? section of the formula, but it still fails.

config.log shows:

?
KRB5_LIBS=''
LD='-L/usr/local/opt/mysql at 5.7/lib/'
LDAP_LIBS=?'
?

And mysqlclient is here:

$ locate mysqlclient
/usr/local/Cellar/mysql at 5.7/5.7.24/lib/libmysqlclient.20.dylib
/usr/local/Cellar/mysql at 5.7/5.7.24/lib/libmysqlclient.a
/usr/local/Cellar/mysql at 5.7/5.7.24/lib/libmysqlclient.dylib
/usr/local/Cellar/mysql at 5.7/5.7.24/lib/pkgconfig/mysqlclient.pc

I changed the formula to:

 ENV['LD']="-L/usr/local/Cellar/mysql at 5.7/5.7.24/lib/?

And still get the same thing.

Any suggestions?

Thanks,

James.
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