I've installed Ocamlodbc using opam install odbc, but I can't work out how to build an app that uses it with ocamlbuild. The examples that come with the source don't build either.
If I put
#require "odbc";;
into my .ocamlinit, I can open Odbc_unixodbc;; in utop, but any reference to functions in that module result in a "Reference to undefined global 'Odbc_unixodbc'" error.
The following snippet also fails with an error about no implementation for "Odbc_unixodbc"
open Odbc_unixodbc
let () = ignore (Odbc_unixodbc.connect "DSN" "UID" "PWD")
Trying
open Odbc
fails with "Unbound module Odbc"
I'm building the code with
ocamlbuild -pkg odbc test.native
The generated documentation for the package seem to suggest I should be opening the "Ocamlodbc" module, but that also results in an "Unbound module" error.
TL;DR
ocamlbuild -use-ocamlfind -pkg odbc test.native
Description
-use-ocamlfind tells ocamlbuild to use ocamlfind system to find libraries on your system. Otherwise, without this flag, you need to provide flags with concrete locations and also take care of the package dependencies. So, it is a good idea to always use ocamlfind.
If this command still doesn't work for you, then make sure, that you chose the right package name. You can use ocamlfind list to look at the set of all packages available on your system.
Further reading
While the above is ok for small programs, I would suggest to use OASIS system to handle all the flags for you.
You can start from this example, adapting dependency list to your neeeds.
Related
I attempted to install the Traffic library for the book "A Touch of Class" but was not able to compile the examples. EiffelStudio complained about a base2.ecf file.
Error code: VD00
General configuration parsing error.
What to do: fix the configuration file.
Could not open file: \base2.ecf
$EIFFELBASE2\base2.ecf
base2.ecf is found in where Windows installed Eiffel: C:\Program Files\Eiffel Software\EiffelStudio 18.11 GPL\unstable\library\base2.ecf The offending line of code seems to be this in the Traffic configuration files:
I have attempted to change this configuration file pointing directly to where the file is, using the actual path, to no avail.
Setting the variable EIFFELBASE2 might help:
set "EIFFELBASE2=C:\Program Files\Eiffel Software\EiffelStudio 18.11 GPL\unstable\library"
Then, EiffelStudio should be started from the environment where the variable is set.
(However, I wonder if this is the library to be used with the examples, or if there is another one that comes together with the examples.)
The simple directions found all over the internet for installing Core using OPAM no longer work. What is the new way to install and use Core?
I think I tracked the problem down to a message on the ocaml-core mailing list about renaming several dependencies https://groups.google.com/forum/#!topic/ocaml-core/Te6LTiNBO08.
Paired down, the widely published installation instructions amount to two steps after installing opam itself:
$ opam install core
$ cat >> ~/.ocamlinit <<EOF
#use "topfind";;
#thread;;
#camlp4o;;
#require "core.top";;
#require "core.syntax";;
EOF
Following these directions result in an error about the "sexprlib.syntax" package missing when using ocaml (or corebuild, utop, etc).
Failing directions can be found in this widely referenced ebook
https://github.com/realworldocaml/book/wiki/Installation-Instructions#setting-up-and-using-utop
and are reflected in directions here on Stackoverflow in questions such as:
Ocaml utop library paths, Core module
What is the new way to set up Core?
opam install core no longer seems to be sufficient since it does not pull in the new syntax packages. I am not sure if this is a dependency bug or not.
The recommended ocamlinit settings also seem wrong.
I found that the core 113.24.00 is defective and all the installation instructions on the net as of this writing are out of date.
Users must make the following corrective steps:
Remove all #require references to packages ending in .syntax from ~/.ocamlinit.
Make your own corebuild script without any references to syntax packages
as found at https://github.com/janestreet/core/blob/master/corebuild.
You may also remove the #camlp4o;; line from your .ocamlinit as this library is no longer required by Core.
I am attempting to run foswiki on OpenBSD. Things are installed and i am able to open "/bin/Configure" page of foswiki configuration screen. but the page reports few errors, complaining that following files are either not found or outdated and new versions are required.
The Files are : grep, rcs, ci, co,rlog, rcsdiff
I tried commands like "pkg_add -Uu" to upgrade packages installed, but it reports all packages are uptodate.
I also tried "pkg_add rcs" "pkg_add grep" etc but non works.
So my basic question is how to I update above files to their latest version required by foswiki.
Regards
While I’m not familiar with Foswiki, my first thought is your web server is chrooted, as this is the default on OpenBSD, and, as a result, Foswiki cannot find the files it needs. You can copy the files Foswiki needs into the chroot or run the web server without chroot, which is bad from a security perspective.
all programs mentioned are part of a base openbsd install and the above answer is correct. the openbsd documentation on chrooted apache has more info.
if you don't have to stick with foswiki you can try dokuwiki instead which has package support on openbsd and installs easily in very much the same way you tried already:
sudo pkg_add -U dokuwiki
hope the process is pretty much self-descriptive. in addition, the manpage for pkg_add is a good thing to read. good luck!
I have: gstreamer-sdk, gstreamer-ffmpeg, gstreamer-plugins-good, bad, and ugly. I googled everywhere for this error and have found nothing relevant. I'm going a little nuts trying to figure out this error:
Error received from element decodebin20: Your GStreamer installation is missing a plug-in.
Debugging information: gstdecodebin2.c(3576): gst_decode_bin_expose (): /GstPlayBin2:playbin20/GstURIDecodeBin:uridecodebin0/GstDecodeBin2:decodebin20:
no suitable plugins found
It throws when I run my gstreamer program. Any ideas on why?
You may not be missing any plugins at all.
This error can be a result of just an unlinked pipeline.
Playbin2(decodebin2) got some changes that made it unable to automatically link up some pipelines that formally worked, for example transcoding a decoder to an encoder. In my case, explicitly adding the ffdec_h264 that it used to add automatically fixed it.
Relying on the Playbin2 can be very frustrating when it does not work. Using the setup below, you can create a .png diagram of the pipeline in various phases of construction. It's very helpful in finding why it isn't linking up.
export GST_DEBUG_DUMP_DOT_DIR=~/gstdump
for f in $GST_DEBUG_DUMP_DOT_DIR/*.dot ; do dot -T png $f >$f.png; done
This tool also lets you learn from it how to link up pipelines, and replace them with explicit ones that are easier to debug and less likely to break.
In Fedora, I resolved this issue removing gstreamer1-vaapi.x86_64:
sudo yum remove gstreamer1-vaapi.x86_64
uridecodebin is part of the "base" plugin set, so make sure you have gstreamer-plugins-base.
Another thing to look into is your LD_LIBRARY_PATH and GST_PLUGIN_PATH. If they point to a different GStreamer installation, it could cause problems like this. Also, if you didn't install GStreamer with a package manager, you may need to set your LD_LIBRARY_PATH to point to it (or better yet, install it with a package manager).
Pleas try to use gst-inspect command to find out if environment is correctly setup.
use gst-launch -v playbin2 uri = "your_uri_here" to find more information to trace this issue.
I have a Solaris package with depend file. When I install the package, it ignores the dependencies.
My depend file looks like this:
P SUNWcsu Core Solaris, (Usr)
P XXCore My core package
I am able to install the package even if XXCore is not installed.
My Prototype looks like this:
i pkginfo
i depend
i request
Thanks in advance.
BTW, other install files (request, checkinstall, etc) are handled correctly.
UPDATE:
I have made some changes to the depend file so it looks like one that works fine. I only changed Tab to white space. Now it behaves differently - I get the following:
Verifying package dependencies.
WARNING:
The XXCore package "My core package" is a
prerequisite package and should be installed.
Do you want to continue with the installation?
It is better, but I want the installation to stop, without the option to continue
Should you want to enforce a prerequisite, you can prevent the package installation by using a checkinstall or preinstall script that check for required the package presence and exit in error if not.