CentOS 7 install guide is missing some packages

[tiltX]

I've successfully built OpenRV on CentOS 7 but I had to perform some extra steps that were not mentioned in the instructions (OpenRV/docs/build_system/config_linux_centos7.md):

• it's necessary to install the ninja build system as well as meson: sudo yum install ninja-build meson
• at some point, the build failed with an error and upon inspection of the file name that was mentioned, I've noticed the shebang for tcsh at the beginning. I was able to complete the build after installing tcsh using sudo yum install tcsh

I have also experienced a weird Qt-related issue and I couldn't figure out the source of it. I had installed Qt 5.15.2 in its default location (~/Qt). rvcmds.sh detected this as QT_HOME, but rvbootstrap failed early on because it couldn't copy Qt resources and translations from /opt/Qt/5.15.2/

I don't know cmake enough to figure out where that path came from, and I had installed Qt into that custom location in /opt at some point in the past. Maybe something was still cached somewhere and it's not a problem that can occur for other people. In my case I was able to work around this by simply adding a symlink from ~/Qt to /opt/Qt.