Re: /usr/local [was: CPPFLAGS prob]

[Russell Shaw]

Dan Kegel wrote:
> Murray Cumming wrote:
>
> > > I think one needs a separate copy of pkg-config for each toolchain
> > > you want to build things with.  (Or at least its data files)...
> >
> > No, that makes no sense.
>
> Nevertheless, even after reviewing "man pkg-config", I think it's true.
> Take a look at the output of "strings /usr/bin/pkg-config | grep /":
>
>  /usr/lib/pkgconfig
>  /usr/include
>  -L/usr/lib
>  -L /usr/lib
>  Package %s has -L/usr/lib in Libs
>  Removing -L/usr/lib from libs for %s
>
> And look at some of the files in /usr/lib/pkgconfig:
>
> ::::::::::::::
> audiofile.pc
> ::::::::::::::
> prefix=/usr
> exec_prefix=/usr
> libdir=/usr/lib
> includedir=/usr/include
>
> The only way pkg-config can work is if you have a separate
> copy of pkg-config and its data files for each copy of the userland 
> libraries.
> This makes perfect sense: for each value of $prefix, you'll
> have a separate copy of $prefix/usr/bin/pkg-config and 
> $prefix/usr/lib/pkgconfig.
>
> Unless you're familiar with cross-compiling, you probably won't understand
> or care about any of the above.  That may change, though, as multiarch 
> systems
> become more common.  See http://raw.no/debian/amd64-multiarch-2, which
> proposes putting libraries and include files not in /usr/include but in
> /usr/$(gcc -dumpmachine)/{lib,include}
> where gcc is the gcc associated with that copy of userland.
>
> - Dan

Only one pkg-config is needed. Each library supplies its own .pc file.
ls /usr/lib/pkg-config:

/usr/lib/pkgconfig/atk.pc
/usr/lib/pkgconfig/audiofile.pc
/usr/lib/pkgconfig/bonobo-activation-2.0.pc
/usr/lib/pkgconfig/directfb-internal.pc
/usr/lib/pkgconfig/directfb.pc
/usr/lib/pkgconfig/esound.pc
/usr/lib/pkgconfig/fontconfig.pc
/usr/lib/pkgconfig/freetype2.pc
/usr/lib/pkgconfig/gconf-2.0.pc
/usr/lib/pkgconfig/gdk-2.0.pc
/usr/lib/pkgconfig/gdk-pixbuf-2.0.pc
/usr/lib/pkgconfig/gdk-pixbuf-xlib-2.0.pc
/usr/lib/pkgconfig/gdk-x11-2.0.pc
/usr/lib/pkgconfig/gdk.pc
/usr/lib/pkgconfig/glib-2.0.pc
/usr/lib/pkgconfig/glib.pc
/usr/lib/pkgconfig/gmodule-2.0.pc
/usr/lib/pkgconfig/gmodule.pc
/usr/lib/pkgconfig/gnome-keyring-1.pc
/usr/lib/pkgconfig/gnome-mime-data-2.0.pc
/usr/lib/pkgconfig/gnome-vfs-2.0.pc
/usr/lib/pkgconfig/gnome-vfs-module-2.0.pc
/usr/lib/pkgconfig/gobject-2.0.pc
/usr/lib/pkgconfig/gthread-2.0.pc
/usr/lib/pkgconfig/gthread.pc
/usr/lib/pkgconfig/gtk+-2.0.pc
/usr/lib/pkgconfig/gtk+-x11-2.0.pc
/usr/lib/pkgconfig/gtk+.pc
/usr/lib/pkgconfig/gtk-doc.pc
/usr/lib/pkgconfig/gtk-engines-2.pc
/usr/lib/pkgconfig/ImageMagick++.pc
/usr/lib/pkgconfig/ImageMagick.pc
/usr/lib/pkgconfig/imlibgdk.pc
/usr/lib/pkgconfig/libart-2.0.pc
/usr/lib/pkgconfig/libbonobo-2.0.pc
/usr/lib/pkgconfig/libbonoboui-2.0.pc
/usr/lib/pkgconfig/libexslt.pc
/usr/lib/pkgconfig/libgda.pc
/usr/lib/pkgconfig/libgdgeda.pc
/usr/lib/pkgconfig/libgeda.pc
/usr/lib/pkgconfig/libglade-2.0.pc
/usr/lib/pkgconfig/libgnome-2.0.pc
/usr/lib/pkgconfig/libgnomecanvas-2.0.pc
/usr/lib/pkgconfig/libgnomedb.pc
/usr/lib/pkgconfig/libgnomeprint-2.2.pc
/usr/lib/pkgconfig/libgnomeprintui-2.2.pc
/usr/lib/pkgconfig/libgnomeui-2.0.pc
/usr/lib/pkgconfig/libgsf-1.pc
/usr/lib/pkgconfig/libgsf-gnome-1.pc
/usr/lib/pkgconfig/libIDL-2.0.pc
/usr/lib/pkgconfig/libIDL.pc
/usr/lib/pkgconfig/libpng.pc
/usr/lib/pkgconfig/libpng12.pc
/usr/lib/pkgconfig/libxml-2.0.pc
/usr/lib/pkgconfig/libxml.pc
/usr/lib/pkgconfig/libxslt.pc
/usr/lib/pkgconfig/openssl.pc
/usr/lib/pkgconfig/ORBit-2.0.pc
/usr/lib/pkgconfig/ORBit-CosNaming-2.0.pc
/usr/lib/pkgconfig/ORBit-idl-2.0.pc
/usr/lib/pkgconfig/ORBit-imodule-2.0.pc
/usr/lib/pkgconfig/ORBit.pc
/usr/lib/pkgconfig/pango.pc
/usr/lib/pkgconfig/pangoft2.pc
/usr/lib/pkgconfig/pangox.pc
/usr/lib/pkgconfig/pangoxft.pc
/usr/lib/pkgconfig/render.pc
/usr/lib/pkgconfig/xcursor.pc
/usr/lib/pkgconfig/xft.pc
/usr/lib/pkgconfig/xrender.pc


dpkg -S /usr/lib/pkgconfig/xrender.pc

  libxrender-dev: /usr/lib/pkgconfig/xrender.pc