CMake mysql_version check using mysql_version.h flakey

~/build_maxscale$  cmake ../maxscale  -DBUILD_TESTS=Y -DWITH_SCRIPTS=N -DWITH_MAXSCALE_CNF=N

-- CMake version: 3.5.1

-- Looking for include file arpa/inet.h

-- Looking for include file arpa/inet.h - found

-- Looking for include file crypt.h

-- Looking for include file crypt.h - found

-- Looking for include file ctype.h

...

...

-- Performing Test HAVE_RABBITMQ50

-- Performing Test HAVE_RABBITMQ50 - Success

-- Found RabbitMQ version 0.7.1: /usr/lib/powerpc64le-linux-gnu/librabbitmq.so

-- Found RabbitMQ development headers at: /usr/include

-- Found OpenSSL: /usr/lib/powerpc64le-linux-gnu/libssl.so;/usr/lib/powerpc64le-linux-gnu/libcrypto.so (found version "1.0.2g")

-- Valgrind not found.

-- Dynamic MySQL client library not found.

-- Static MySQL client library not found.

-- Looking for LIBMARIADB

-- Looking for LIBMARIADB - found

-- Found MariaDB Connector-C

CMake Error at cmake/FindMySQL.cmake:12 (message):

  Cannot find the mysql_version.h header

Call Stack (most recent call first):

  CMakeLists.txt:37 (find_package)

-- Configuring incomplete, errors occurred!

See also "/home/danielgb/build_maxscale/CMakeFiles/CMakeOutput.log".

See also "/home/danielgb/build_maxscale/CMakeFiles/CMakeError.log".