[QGIS-Developer] build fails

[Donald Harter]

I fetched and pulled the latest source code for Qgis and it does not 
build.  Is there some sort of new dependency?  My distribution does not 
have such a package.

-- Qt WebKit support enabled
CMake Error at CMakeLists.txt:303 (FIND_PACKAGE):
   By not providing "FindQt5SerialPort.cmake" in CMAKE_MODULE_PATH this
   project has asked CMake to find a package configuration file provided by
   "Qt5SerialPort", but CMake did not find one.

   Could not find a package configuration file provided by "Qt5SerialPort"
   with any of the following names:

     Qt5SerialPortConfig.cmake
     qt5serialport-config.cmake

   Add the installation prefix of "Qt5SerialPort" to CMAKE_PREFIX_PATH 
or set
   "Qt5SerialPort_DIR" to a directory containing one of the above files.  If
   "Qt5SerialPort" provides a separate development package or SDK, be 
sure it
   has been installed.


-- Configuring incomplete, errors occurred!



Distributor ID:	Ubuntu
Description:	Ubuntu 18.04 LTS
Release:	18.04
Codename:	bionic


git branch
* master
   release-3_0