Created attachment 516242 [details] build.log emerging pyqwt fails during the compile phase due to undefined references.
Please provide emerge --info.
Created attachment 516330 [details] emerge --info
Given that qt4 is being phased out, we might just drop this package entirely.
Yes, please remove Qt 4 revdeps with dead upstreams.
dev-python/pyqwt was last-rited and removed.