Building Mysql-Plugin on OS X with Qt 5.9.1 fails

gaess

Hello forum users,
I'm trying to build the MySql-Plugin on OS X. mysql headers are installed, I've also compiled the mysql drivers for Qt 5.7.1 on the same machine about a year ago. I haven't uninstalled any mysql-dev files since then.
My mysql-Installation is here:

/usr/local/mysql/

In it, I've got a 'lib' folder and an 'include' folder

Inside the 'lib' folder, I've got among others a 'libmysqlclient.20.dylib' and 'libmysqlclient_r.dylib'

In the 'include' folder there is a bunch of header files.

Now, trying to compile my MySql-Plugin with these commands:

cd /Users/NAME/Qt/5.9.1/Src/qtbase/src/plugins/sqldrivers/mysql
/Users/NAME/Qt/5.9.1/clang_64/bin/qmake "INCLUDEPATH+=/usr/local/mysql" "LIBS+=-L/usr/local/mysql/ -lmysqlclient_r" mysql.pro

Reveales this error:

IBS+=-L/usr/local/mysql -lmysqlclient_r" mysql.pro
Project ERROR: Library 'mysql' is not defined.

Edit: Meanwhile, I've found out, that the error comes from this line in mysql.pro:

QMAKE_USE += mysql

But mysql.h is present in /usr/local/mysql/include
End edit.

Trying to configure my source on top level with -sql-mysql leads to another error:

./configure -sql-mysql -I/usr/local/mysql
ERROR: Feature 'sql-mysql' was enabled, but the pre-condition 'libs.mysql' failed.

I'm on a freshly installed Src tree, just downloaded from the Qt server.
Any hints how to resolve any of these errors?
Is there anything wrong with my include paths?

gaess

Replying my own question:
The following tweaks worked for compiling the libs:
Change mysql.pro to:

TARGET = qsqlmysql

HEADERS += $$PWD/qsql_mysql_p.h
SOURCES += $$PWD/qsql_mysql.cpp $$PWD/main.cpp

LIBS += -L/usr/local/mysql/include

#QMAKE_USE += mysql

OTHER_FILES += mysql.json

PLUGIN_CLASS_NAME = QMYSQLDriverPlugin
include(../qsqldriverbase.pri)

Then run qmake like this:

/Users/daniel/Qt/5.9.1/clang_64/bin/qmake "INCLUDEPATH+=/usr/local/mysql" "LIBS+=-L/usr/local/mysql/lib -lmysqlclient" "INCLUDEPATH+=/usr/local/mysql/include" mysql.pro

make and install:

make
make install

My Application is still not using the Mysql-driver, but that the next step, I presume.

Edit: make install line added