QtWebview 5.7 on Raspberry Pi 3

[sly110]

All,
I have a Qt5.7 app being developed for Raspberry Pi 3. There is a need to display HTML help files to the user. When I run the app built for Ubuntu16, I include QtWebView and all works well. However, when I try to build for RPi. the include of QtWebView fails to compile.

#SLY TODO: Fix webview for RPI
QT += core quick serialport quickcontrols2 sql webview

int main(int argc, char *argv[])
{
//remove previous log files
QFile::remove("/acx/logs/log.main");
QFile::remove("/acx/logs/log.comm");
QGuiApplication app(argc, argv);
//SLY TODO FIX for RPI:
QtWebView::initialize();

import QtWebView 1.1

The error is invalid module. Qt was build from 5.7 everywhere source and should have contained all modules. If I try to compile just the qtwebkit-opensource-src-5.7.0 I get errors such as The WebKit build was disabled for the following reasons:
* ICU is required.
* Missing gperf from PATH
* Missing bison from PATH
* Missing flex from PATH

I understand this module is not the preferred solution BUT can anyone help me get it to work on RPi so that I don't have to move to 5.8 just now??
Many Thanks!

PS My intent is to use the network module as well. Will I have similar problem?

[jsulm]

@sly110 Well, do what it tells you you should do:

• Install Lib ICU
• Install gperf
• Install bison
• Install flex

[sly110]

I will pursue ambershark's comment about a clean environment.
Just an addendum. I was able to make Qt5.8 by skipping QtSerialBus BUT in the make install portion I had errors re: information does not exist and may others. I believe my sysroot is incomplete.
Thanks all