can't install libpcl

[dershow]

I am trying to upgrade or reinstall libpcl. But, it's failing due to a dependency on vtk. It seems to be trying to install the default vtk, but then requires vtk +qt5 which fails to build ticket:61840.

sudo port install libpcl
--->  Computing dependencies for libpcl
The following dependencies will be installed:  vtk
Continue? [Y/n]: Y
--->  Fetching archive for vtk
--->  Attempting to fetch vtk-8.2.0_3.darwin_19.x86_64.tbz2 from https://ywg.ca.packages.macports.org/mirror/macports/packages/vtk
--->  Attempting to fetch vtk-8.2.0_3.darwin_19.x86_64.tbz2.rmd160 from https://ywg.ca.packages.macports.org/mirror/macports/packages/vtk
--->  Installing vtk @8.2.0_3
--->  Activating vtk @8.2.0_3
--->  Cleaning vtk
--->  Configuring libpcl
Error: Failed to configure libpcl: vtk must be installed with +qt5.
Error: See /opt/local/var/macports/logs/_Users_adershowitz_Programming_ports_gis_libpcl/libpcl/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port libpcl failed

[mf2k (Frank Schima)]

You need to do what it says and manually install the +qt5 variant for vtk. Ports cannot depend on another port with a non-default variant.