kerl --with-wx doesn't create an erlang installation with wxe_driver.so. Should it? I'm trying to make an erlang build that will run observe, but still get:
ERROR: Could not find 'wxe_driver.so' in: /home/don/erlangs/17.4/lib/wx-1.3.2/priv
.kerlrc contains:
KERL_CONFIGURE_OPTIONS="--with-wx"
Erlang build procedure just skips some optional components build steps if build host system does not have all the required dependencies to build that components, even configure (or kerl) was told to make build with that components included
If you find yourself in a situation where Erlang, that was built from source, blames some module could not be loaded, you should check if it was built
In this particular case
Look for errors in a file named config.log under ~/.kerl. It should indicate what's missing.
To build wxe_driver you should have WX development libraries installed on your system. You have to refer to your system documentation to learn how to install them. In this case, since glu.h was missing, running sudo apt-get install build-essential libsdl1.2debian libsdl1.2-dev libgl1-mesa-dev libglu1-mesa-dev libsdl-image1.2 libsdl-image1.2-dev added the missing file.
Related
I'm trying to deploy an asp.net core 3.1 API on cloud foundry. I don't have admin rights, i just have developer rights. Is there a way to specify the URL of these libraries (libc6-dev, libgdiplus and libx11-dev) (maybe git or some official repository) so that i can execute the manifest.yml file during deployment and install these dependencies? Also to mention, i cannot turn on support for docker file on cloud foundry, as i get a message (insufficient rights)
I would suggest you give the apt-buildpack a try. You can give it additional Ubuntu package names, and it will install those for you.
You do that through an apt.yml file. Check out this post for instructions.
It's important to understand that the apt-buildpack will install these packages into a non-standard location. Since it also runs as a non-root user, it cannot install them into standard locations.
To work around this limitation, it sets variables like $PATH and $LD_LIBRARY_PATH to point to the locations where it has installed items. Most build tools will pick up these env variables and be able to locate what you install.
It's not perfect though, and some tools require additional env variables to be set. If you still get errors when building, look at your build tools and check if there are ways you can point to where apt-buildpack is installing stuff. The path it writes to can vary based on your buildpack order, but if you print out $PATH you can see the location. It's often /home/vcap/deps/0/... but the index can change based on your buildpack order.
I have a kinda weird problem. I'm currently messing around with the VRX-Simulator, which simulates an unmanned-watersurface-vehicle.
For the installation I followed the guide on https://bitbucket.org/osrf/vrx/wiki/tutorials/SystemSetupInstall.
Then I tried to modify some of the files and tried to rebuild the project.
This was the point when I noticed it always used the "old" version of my simulation within gazebo.
From now on no matter what I did (I even deleted the whole catkin workspace folder) ROS somehow managed to always launch the original version of my simulation even without any build/src folder existing when I used roslaunch.
roslaunch vrx_gazebo sandisland.launch
So my question would be how can I get rid of my simulation/model and where does ros/gazebo cache my simulation?
You most probably installed the package with the command from the tutorial sudo apt install ros-melodic-vrx-gazebo. So the package launched with roslaunch vrx_gazebo sandisland.launch was not in your catkin workspace. If you want to get rid of it you can uninstall it with sudo apt remove ros-melodic-vrx-gazebo. But this is not strictly necessary.
There are several ways to find out where some ros package is located, try running some of these commands:
rospack find vrx_gazebo will show you where the package used is located
roscd vrx_gazebo will take you to the folder where it is installed something like
/opt/ros/melodic/share/vrx_gazebo
If you also followed the tutorials installing from source code then the issue most likely was not sourcing the built packages. The last line of the guide is a bit misleading. The line *Remember to run this command every time you open a new terminal. is meant to reference the command source ~/vrx_ws/devel/setup.bash
Whether the installed package or the package built from source is used depends on which order they are listed in the environment variable ROS_PACKAGE_PATH. This variable is modified by both source /opt/ros/melodic/setup.bash and source ~/vrx_ws/devel/setup.bash. So have a look at the variable after each step with printenv | grep ROS or echo $ROS_PACKAGE_PATH. Theoretically if you source your terminal in the order I had the source commands it should be using the package built from source, you can verify with the rospack find ... and roscd ... commands mentioned earlier.
In the end it is probably easier to add the sourcing commands to your .bashrc file so you would not forget to source the terminals as mentioned in the ROS installation tutorial. You can add the sourcing of the workspace to the the same file, you will just have to be aware that you would need to change the file, should you want to use a different workspace.
http://wiki.ros.org/melodic/Installation/Ubuntu#melodic.2BAC8-Installation.2BAC8-DebEnvironment.Environment_setup
relevant command from the tutorial:
echo "source /opt/ros/melodic/setup.bash" >> ~/.bashrc
you could do the same for the workspace:
echo "source ~/vrx_ws/devel/setup.bash" >> ~/.bashrc
And after running those commands run exec bash to get the changes into the current terminal. All future terminals will have those commands already loaded.
I have cloned and built the waf script using:
./waf-light configure
Then to build my project (provided by Gomspace) I need to add waf and the eclipse.py to my path. So far I haven't found better than this setenv script:
WAFROOT=~/git/waf/
export PYTHONPATH=$WAFROOT/waflib/extras/:$PYTHONPATH
export PATH=~/git/waf/:$PATH
Called with:
source setenv
This is somehow a pretty ugly solution. Is there a more elegant way to install waf?
You don't install waf. The command you found correctly builds waf: /waf-light configure build Then for each project you create, you put the built waf script into that projects root directory. I can't find a reference, but this is the way in which waf:s primary author Thomas Nagy wants the tool to be used. Projects that repackage waf to make the tool installable aren't "officially sanctioned."
There are advantages and disadvantages with non-installation:
Disadvantages:
You have to add the semi-binary 100kb large waf file to your repository.
Because the file contains binary code, people can have legal objections to distributing it.
Advantages:
It doesn't matter if new versions of waf break the old API.
Users don't need to install waf before compiling the project -- having Python on the system is enough.
Fedora (at least Fedora 22) has a yum package for waf, so you could see that it's possible to do a system install of waf, albeit with a hack.
After you run something like python3 ./waf-light configure build, you'll get a file called waf that's actually a Python script with some binary data at the end. If you put it into /usr/bin and run it as non-root, you'll get an error because it fails to create a directory in /usr/bin. If you run it as root, you'll get the new directory and /usr/bin/waf runs normally.
Here's the trick that I learned from examining the find_lib() function in the waf Python script.
Copy the waf to /usr/bin/waf
As root, run /usr/bin/waf. Notice that it creates a directory. You'll see something like /usr/bin/.waf-2.0.19-b2f63c807a4215294bf6005410c74c18
mv that directory to /usr/lib, dropping the . in the directory name, e.g. mv /usr/bin/.waf-2.0.19-b2f63c807a4215294bf6005410c74c18 /usr/lib/waf-2.0.19-b2f63c807a4215294bf6005410c74c18
If you want to use waf with Python3, repeat Steps 2-3 running the Python script /usr/bin/waf under Python3. Under Python3, the directory names will start with .waf3-/waf3- instead instead of .waf-/waf-.
(Optional) Remove the binary data at the end of /usr/bin/waf.
Now, non-root should be able to just use /usr/bin/waf.
That said, here's something to consider, like what another answer said: I believe waf's author intended waf to be embedded in projects so that each project can use its own version of waf without fear that a project will fail to build when there are newer versions of waf. Thus, the one-global-version use case seems to be not officially supported.
I am working on a project that is transitioning from CMake to Bazel. One critical feature that we are apparently losing in the bargain is the ability to install the project, so that it can be used by other (not necessarily Bazel) projects.
AFAICT, there is currently no built in support for installing a project?!
I need to create a portable (must work on at least Linux and MacOS) way to install the project. Specifically:
I need to be able to specify libraries, headers, executables, and other files (e.g. LICENSE) that need to be installed.
The user needs to be able to specify an absolute prefix where things should be installed.
I really, really should be able to execute the "install" step more than once, giving different prefixes each time, without Bazel getting confused (i.e. it must not try to "remember" what files it already installed, or if it does, must understand when the prefix is different from last time).
Libraries should be installed to the right place (e.g. lib64), or at least it should be possible for the user to specify the correct libdir.
The install step MUST NOT touch the time stamp on any file from a previous install that has not changed. (Ideally, Bazel itself would handle this; using the install command is tricky and has potential portability issues. Note platform requirements, above.)
What is the best way to go about doing this?
Unless you want to do specific package (e.g. deb or rpm), you probably want to create an executable rule that does the install for you.
You can create a rule that would create an executable (e.g. a shell script) that does the install for you (e.g. do checksums to check if there are change to the installed file and does the actual copy of the files if they have changed). You would have to use the extension language to do, that would look similar to what the docker rules does to load an image with the incremental loader
Addition: I forgot to say that the install itself would be run by using the run command: bazel run install if the rule is named install in the top level BUILD file.
I hunted around but I couldn't determine if this is possible.
Basically, http://luarocks.org is down, and I already have a copy of luafilesystem installed on another machine locally here. With Ruby, it's possible to cross install ruby gems using the 'gem' command locally. I'm wondering if the same is possible with rocks and luarocks.
Is there any way to 'cross-install' a rock (for instance, luafilesystem), by using another local installation of that rock?
Something like:
luarocks install //10.0.1.123/machine/path/to/luafilesystem/on/other/machine
is what I'd like to be able to do.
UPDATE: I'd even be happy with how to install a rock from the .tar.gz or .zip, for instance, if I downloaded one of the images from this location (in the case of LuaFileSystem).
In which case, the 'source' for the install would / could be local to the machine, rather than remote (and wouldn't necessarily already be installed as a rock).
If you have the source zip, you can unpack it and point luarocks to the the rockspec file. Here is how I installed 'busted' from source.
git clone https://github.com/Olivine-Labs/busted.git
luarocks install busted/busted-1.3-1.rockspec
Or install it directly from source
cd busted
luarocks make
LuaRocks has a pack subcommand that will create a binary rock (a zip file containing all files for an installed module). You can use that binary rock to install the same module on another computer, given that the architecture matches.
E.g.
luarocks pack luafilesystem
produces luafilesystem-1.6.2-2.linux-x86_64.rock on my machine, and
luarocks install luafilesystem-1.6.2-2.linux-x86_64.rock
will reinstall luafilesystem with no internet connection necessary.
If Someone want an installation from the local source rock.
Just do this:
cd /path/to/source-rock
luarocks make source-rock.rockspec
NOTE:
Use make instead of install. The reason is here (quoted below).
LuaRocks offers this:
make Compile package in current directory using a rockspec.
install Install a rock.
However, install does not utilize the present make. It tries
to download and recompile the same package from the server instead
of the one I customized locally.
Any way round this?
The make command will actually build and install your customized
rockspec. The poor naming choice causes confusion every now and then,
I know.