Comment 6 for bug 1393697

This bug also affects packages cross-compiled for armhf that attempt to use qmake:

$ sbuild --build=amd64 --host=armhf -d trusty myapp_1.0.dsc

...

   dh_auto_configure -a
qmake: could not find a Qt installation of ''
dh_auto_configure: qmake -makefile -nocache QMAKE_CFLAGS_RELEASE=-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 QMAKE_CFLAGS_DEBUG=-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 QMAKE_CXXFLAGS_RELEASE=-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 QMAKE_CXXFLAGS_DEBUG=-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 QMAKE_LFLAGS_RELEASE=-Wl,-Bsymbolic-functions -Wl,-z,relro QMAKE_LFLAGS_DEBUG=-Wl,-Bsymbolic-functions -Wl,-z,relro QMAKE_STRIP=: PREFIX=/usr returned exit code 1
make: *** [build-arch] Error 2
dpkg-buildpackage: error: debian/rules build-arch gave error exit status 2