net-wireless/gnuradio-3.7.5[qt4] needs >=x11-libs/qwt-6.* while in the ebuild it specifies >=dev-python/pyqwt-5.2:5[${PYTHON_USEDEP}] having qwt:5 installed but not qwt:6 makes the build of gnuradio with +qt4 fail Reproducible: Always
a quick look around shows that you are correct. I need to do some testing on arm to officially fix this, please standby for a bit while we watch very slow scrolling text.
all set, thanks for the report!