DEPLOYMENTFOLDERS setting in .pro file not working - qt

Question

I am creating a QML Qt5 project, and want to automatically copy my qml files into the build folder when I click build. I've edited my .pro file to include:
qmlFolder.source = qml
qmlFolder.target = .
DEPLOYMENTFOLDERS += qmlFolder
message("adding qml folder")
My project source folder structure is:
|
+-- build
+-- source
|
+--main.cpp
|
+--qml
|
+---main.qml
So when I click build I see the "adding qml folder" message in the Compile Output tab (in Qt creator) so I know make is reading the .pro file. But the build folder is missing ANY qml files. And I don't see any copy messages, or error message with build output.
Why isn't my DEPLOYMENTFOLDERS statement working? (I'm compiling under Linux in case that matters)
The DEPLOYMENTFOLDERS directive is not well documented but should work as noted in this SO question

Answer 1

It turns out that .pro feature is actually available in a deployment.pri file (which I failed to include). Once incuded, and adding the qtcAddDeployment line to the .pro file, the feature worked as expected.
The important part of the .pri file is:
defineTest(qtcAddDeployment) {
for(deploymentfolder, DEPLOYMENTFOLDERS) {
item = item$${deploymentfolder}
greaterThan(QT_MAJOR_VERSION, 4) {
itemsources = $${item}.files
} else {
itemsources = $${item}.sources
}
$$itemsources = $$eval($${deploymentfolder}.source)
itempath = $${item}.path
$$itempath= $$eval($${deploymentfolder}.target)
export($$itemsources)
export($$itempath)
DEPLOYMENT += $$item
}
}