I get this too; just built from MeshLabSrc_AllInc_v133.tgz; had to disable some plugins;...
Yes, it's part of MPIR https://github.com/wbhart/mpir/blob/master/mpirxx.h MPIR does...
I ran into this error building from the latest source MeshLabSrc_AllInc_v133.tgz,...
Note: this fix didn't make it into MeshLabSrc_AllInc_v133.tgz
Cannot Select by color (post 'Voronoi vertex coloring')
‘class GLArea’ has no member named ‘devicePixelRatio' in glarea.cpp
C++11 feature 'nullptr' in src/meshlab/mainwindow_RunTime.cpp since -r6246
Bad syntax in src/external/external.pro -r6221 (trunk)