pkg-config vs X11

Alexander Toresson alexander.toresson at
Thu Oct 16 12:55:20 CEST 2008

On Thu, Oct 16, 2008 at 9:25 AM, Anders F Björklund <afb at> wrote:
> Alexander Toresson wrote:
>> You could always create .pc files for the libraries in question.
> Create, where ? You mean as a add-on system patch for the user to
> install in /usr/X11R6/lib/pkgconfig ? Or local to xfce4-settings ?

Either in a system-wide location, or in a directory you yourself add

>> If you haven't got them, you have to either do that, or patch the
>> configure scripts -- XDT_CHECK_PACKAGE relies exclusively on
>> pkg-config for checking whether a library is installed.
> Well, that is what I was hoping to avoid (patching configure*),
> but if it is exclusively pkg-config that is what I'll do then.
> After patching (commenting out) the calls to $PKG_CONFIG, the
> port would then feed configure with the values to use instead:
>     configure.env-append       PKG_CONFIG_PATH="${x11prefix}/lib/pkgconfig" \
>        XI_VERSION="1.0.0" XI_CFLAGS="-I${x11prefix}/include" XI_LIBS="-L$
> {x11prefix}/lib -lXi" \
>        LIBX11_VERSION="6.2.0" LIBX11_CFLAGS="-I${x11prefix}/include"
> LIBX11_LIBS="-L${x11prefix}/lib -lX11" \
>        XRANDR_VERSION="2.0.0" XRANDR_CFLAGS="-I${x11prefix}/include"
> XRANDR_LIBS="-L${x11prefix}/lib -lXrandr"
> So basically falling back to -lXi -lX11 -lXrandr seem to be
> working just fine, but I might be missing a few details here...

Well, typically, -I to CFLAGS and -L and -l to LIBS is what is
required, unless the libraries and/or include files are already in a
path that is searched by your compiler, then you may only need -l.

> I do have proper .pc files for the other requirements, it is
> just X11 that is outside my control (and not being updated).
> --anders
> PS. For some reason it does have xcursor.pc installed.
>     But seems to fail to detect it anyway, typically.

Make sure the .pc file says that its version is big enough, and that
all requirements of it is satisfied. If any of these requirements are
not satisfied, detecting a library through pkg-config will fail.

// Alexander

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