From your question I guess you are using Ubuntu (or a derivate). If you use: apt-file search opencv.pc then you see that you have to install libopencv-dev. After you do so, pkg-config –cflags opencv and pkg-config –libs opencv should work as expected.
This is the script I used (Updated Version with input from @elquimista from the comments) #!/bin/bash ln -fs /usr/share/zoneinfo/America/New_York /etc/localtime DEBIAN_FRONTEND=noninteractive apt-get install -y tzdata dpkg-reconfigure –frontend noninteractive tzdata Seems to work fine. As one liner: DEBIAN_FRONTEND=noninteractive apt-get install -y –no-install-recommends tzdata
To check if packagename was installed, type: dpkg -s <packagename> You can also use dpkg-query that has a neater output for your purpose, and accepts wild cards, too. dpkg-query -l <packagename> To find what package owns the command, try: dpkg -S `which <command>` For further details, see article Find out if package is installed in … Read more
Uncommenting DOCKER_OPTS=”–dns 8.8.8.8 –dns 8.8.4.4″ in /etc/default/docker as Matt Carrier suggested did NOT work for me. Nor did putting my corporation’s DNS servers in that file. But, there’s another way (read on). First, let’s verify the problem: $ docker run –rm busybox nslookup google.com # takes a long time nslookup: can’t resolve ‘google.com’ # <— … Read more
See the discussion here: https://github.com/docker/docker/issues/4032. In short, setting ENV DEBIAN_FRONTEND noninteractive is not recommended as it persists in the final image, even when running something like docker run -i -t … bash. Therefore it is recommended either to omit DEBIAN_FRONTEND and live with the warning, or specify it explicitly for each command e.g. RUN DEBIAN_FRONTEND=noninteractive … Read more
The package node is not related to node.js. nodejs is what you want, however it is arguably better to have the command be called node for compatibility with scripts that use #!/usr/bin/env node. You can either just create a symlink in your path: sudo ln -s `which nodejs` /usr/local/bin/node Or you could install nvm and … Read more
Option A If your install isn’t already damaged, you can drop unwanted PostgreSQL servers (“clusters”) using pg_dropcluster. Use that in preference to a full purge and reinstall if you just want to restart with a fresh PostgreSQL instance. $ pg_lsclusters Ver Cluster Port Status Owner Data directory Log file 11 main 5432 online postgres /var/lib/postgresql/11/main … Read more