PkgConfig cannot find directfb

JoeA.B

The project uses CMake to build an embedded Linux environment.
The initial development runs on a Linux desktop. It was working. I renamed a parent folder to avoid scripting issues between two development environments.
I am building on Ubuntu 16.04 inside of VS-Code It generates the output:
[cmake] Qt version: 5.5.1
[cmake] -- Found PkgConfig: /usr/bin/pkg-config (found version "0.29.1")
[cmake] -- Checking for module 'directfb'
[cmake] -- No package 'directfb' found
[cmake] -- Configuring incomplete, errors occurred!

When I ran sudo apt-get install -y libdirectfb-1.2-9 it showed
libdirectfb-1.2-9 is already the newest version (1.2.10.0-5.1).
It is installed in /usr/lib/x86_64-linux-gnu/directfb-1.2-9/

How do I tell my environment (env or VS-Code) how to find the directfb library?

raven-worx

@JoeA-B said in PkgConfig cannot find directfb:

Both pkgconf and pkg-config show directfb DirectFB. I do not know how to create a custom .pc file

then does your CMAKE project even use pkgconfig to look for the directfb lib?
e.g. with https://cmake.org/cmake/help/latest/module/FindPkgConfig.html
If so try adding the path /usr/lib/x86_64-linux-gnu/pkgconfig to the PKG_CONFIG_PATH env variable

and cannot do a direct link.

why not? pkgconfig simply provides the flags used for linking, like you would do when linking against it "manually"

SGaist

Hi,

Your version of DirectFB may possibly not provide a pkg-config file. Do you have a directfb.pc file somewhere in your machine ?

JoeA.B

@SGaist I found the file: /usr/lib/x86_64-linux-gnu/pkgconfig/directfb.pc. My interface project built today but my OS image failed to build. Neither mentioned directfb.

raven-worx

@JoeA-B
this package doesn't contain a pc file: https://packages.ubuntu.com/xenial/amd64/libdirectfb-1.2-9/filelist

To make pkgconf find this library you can create a custom .pc file (in one of pkgconf's search paths) or simply link against it directly like you would do with any other library.

JoeA.B

@raven-worx I do not understand. Both pkgconf and pkg-config show directfb DirectFB. I do not know how to create a custom .pc file and cannot do a direct link.

raven-worx

@JoeA-B said in PkgConfig cannot find directfb:

Both pkgconf and pkg-config show directfb DirectFB. I do not know how to create a custom .pc file

then does your CMAKE project even use pkgconfig to look for the directfb lib?
e.g. with https://cmake.org/cmake/help/latest/module/FindPkgConfig.html
If so try adding the path /usr/lib/x86_64-linux-gnu/pkgconfig to the PKG_CONFIG_PATH env variable

and cannot do a direct link.

why not? pkgconfig simply provides the flags used for linking, like you would do when linking against it "manually"

JoeA.B

@raven-worx I got it to work but am still not sure how setting PKG_CONFIG_PATH helped.

Why not link? I am adding a module to a full operating system and cannot control the rest of the configuration.

raven-worx

@JoeA-B said in PkgConfig cannot find directfb:

Why not link? I am adding a module to a full operating system and cannot control the rest of the configuration

still a simple -ldirectfb parameter should work on all systems, when the plugin is in a default lib directory (which /usr/lib/x86_64-linux-gnu is btw for example on Debian/Ubuntu)