$ snapcraft 
Preparing to pull desktop-ubuntu-app-platform 
Pulling desktop-ubuntu-app-platform 
Cloning into '/home/liuxg/apps/snap-tutorials-code/snap-qt-app/final/parts/desktop-ubuntu-app-platform/src'...
remote: Counting objects: 778, done.
remote: Compressing objects: 100% (8/8), done.
remote: Total 778 (delta 1), reused 0 (delta 0), pack-reused 770
Receiving objects: 100% (778/778), 118.68 KiB | 177.00 KiB/s, done.
Resolving deltas: 100% (410/410), done.
Checking connectivity... done.
'qt-app' has prerequisites that need to be staged: desktop-ubuntu-app-platform
Preparing to build desktop-ubuntu-app-platform 
Building desktop-ubuntu-app-platform 
make FLAVOR=qt5 -j4
make FLAVOR=qt5 install DESTDIR=/home/liuxg/apps/snap-tutorials-code/snap-qt-app/final/parts/desktop-ubuntu-app-platform/install
install -D -m755 desktop-launch /home/liuxg/apps/snap-tutorials-code/snap-qt-app/final/parts/desktop-ubuntu-app-platform/install/bin/desktop-launch
install -D -m644 snappy-qt5-app-platform.conf \
	/home/liuxg/apps/snap-tutorials-code/snap-qt-app/final/parts/desktop-ubuntu-app-platform/install/etc/xdg/qtchooser/snappy-qt5-app-platform.conf
install -D -m644 snappy-qt5.conf \
	/home/liuxg/apps/snap-tutorials-code/snap-qt-app/final/parts/desktop-ubuntu-app-platform/install/etc/xdg/qtchooser/snappy-qt5.conf
install -D -m644 snappy-qt4.conf \
	/home/liuxg/apps/snap-tutorials-code/snap-qt-app/final/parts/desktop-ubuntu-app-platform/install/etc/xdg/qtchooser/snappy-qt4.conf
install -D -m644 flavor-select /home/liuxg/apps/snap-tutorials-code/snap-qt-app/final/parts/desktop-ubuntu-app-platform/install/
Staging desktop-ubuntu-app-platform 
Preparing to pull qt-app 
Pulling qt-app 
Preparing to build qt-app 
Building qt-app 
qmake
/home/liuxg/apps/snap-tutorials-code/snap-qt-app/final/parts/qt-app/build/rssreader.pro:7: Cannot find feature ubuntu-click
make -j4
cd rssreader/ && ( test -e Makefile || /usr/lib/x86_64-linux-gnu/qt5/bin/qmake /home/liuxg/apps/snap-tutorials-code/snap-qt-app/final/parts/qt-app/build/rssreader/rssreader.pro -o Makefile ) && make -f Makefile 
/home/liuxg/apps/snap-tutorials-code/snap-qt-app/final/parts/qt-app/build/rssreader/rssreader.pro:4: Cannot find feature ubuntu-click
Project ERROR: Unknown module(s) in QT: qml quick
Makefile:42: recipe for target 'sub-rssreader-make_first' failed
make: *** [sub-rssreader-make_first] Error 3
Command '['/bin/sh', '/tmp/tmp0ma5gmz4', 'make', '-j4']' returned non-zero exit status 2