Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Dimitri John Ledkov]

On 12 March 2015 at 23:13, Jeff Waugh  wrote:
> On Fri, Mar 13, 2015 at 10:07 AM, Michael Biebl  wrote:
>>> Those are the as-installed versions (they're not manipulated again during 
>>> make).
>>
>> And how does that improve cross-compilation?
>
> It allows you to successfully build other software that uses the
> library. A minor detail. :-)
>

I don't buy this.

When cross-compiling with pkg-config, you do need to ship the
pkg-config files in a different place, in the same location one sets
prefix to. and then use e.g. /usr/bin/arm-linux-gnueabihf-pkg-config
(via wrapper) or simply set PKG_CONFIG_PATH correctly.

Having done a few cross-bootstraps from scratch I don't recall any
bugs/problems with crossbuilding systemd itself, or things that depend
on libsystemd & friends. Can you start from beginning as to how you
are cross compiling things on the OpenWRT and why it is failing for
you? What is your host? What is your cross-chroot? What are your
PKG_CONFIG_PATH? What's the contents of the generated .pc file? Where
do you install it, and how does it fail for you?

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Dimitri.

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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Zbigniew Jędrzejewski-Szmek]

On Fri, Mar 13, 2015 at 09:54:48AM +1100, Jeff Waugh wrote:
> On Fri, Mar 13, 2015 at 8:53 AM, Zbigniew Jędrzejewski-Szmek
>  wrote:
> > So you prefer the second version to the first, right? Does not
> > exec_prefix get assigned and then substituted, leading to an identical
> > result?
> 
> Those are the as-installed versions (they're not manipulated again during 
> make).
I wasn't sufficiently clear. I meant substituted *by pkg-config*,
leading to an identical result for anything which queries pkg-config
for those values.

> >> And how does that improve cross-compilation?
> >
> > It allows you to successfully build other software that uses the
> > library. A minor detail. :-)
>
> Well, I was looking for a more elaborate explanation, why that change
> makes a difference.
> To me, the resulting .pc are basically the same. So there must be
> something else I'm missing.
Exactly my thoughts.

Zbyszek
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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Michael Biebl]

2015-03-13 0:13 GMT+01:00 Jeff Waugh :
> On Fri, Mar 13, 2015 at 10:07 AM, Michael Biebl  wrote:
>>> Those are the as-installed versions (they're not manipulated again during 
>>> make).
>>
>> And how does that improve cross-compilation?
>
> It allows you to successfully build other software that uses the
> library. A minor detail. :-)

Well, I was looking for a more elaborate explanation, why that change
makes a difference.
To me, the resulting .pc are basically the same. So there must be
something else I'm missing.


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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Jeff Waugh]

On Fri, Mar 13, 2015 at 10:11 AM, Lucas De Marchi
 wrote:
> Both kmod and systemd are being crosscompiled for quite some time by yocto, 
> buildroot, etc

It does interest me that buildroot doesn't have an equivalent change,
despite (at least) pciutils depending on it.
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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Jeff Waugh]

On Fri, Mar 13, 2015 at 10:11 AM, Lucas De Marchi
 wrote:
> I can't but think this is just to conform to other (gnome) projects.

These patches come from an absolutely non-GNOME environment (OpenWrt),
but I'm appealing to an authority in actively maintained GNOME code as
that's where pkg-config comes from and a project I'm historically
familiar with.
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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Jeff Waugh]

On Fri, Mar 13, 2015 at 10:07 AM, Michael Biebl  wrote:
>> Those are the as-installed versions (they're not manipulated again during 
>> make).
>
> And how does that improve cross-compilation?

It allows you to successfully build other software that uses the
library. A minor detail. :-)

Thanks,
Jeff
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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Lucas De Marchi]

On Thu, Mar 12, 2015 at 6:57 PM, Zbigniew Jędrzejewski-Szmek
 wrote:
> On Thu, Mar 12, 2015 at 11:00:55AM +0100, Kay Sievers wrote:
>> On Thu, Mar 12, 2015 at 5:09 AM, Lucas De Marchi
>>  wrote:
>> > On Tue, Mar 10, 2015 at 3:04 PM, Jeff Waugh  wrote:
>> >> Generate pkg-config files during configure as God (Havoc) intended. This 
>> >> fixes
>> >> all of systemd's pkg-config files when cross-compiling (and possibly 
>> >> other use
>> >> cases).
>>
>> > Kay, please take a look on this. There's a similar patch pending to
>> > kmod on [1]. I'm still not sure what exactly it's fixing... seems like
>> > just that it would not replace/expand all occurrences of the
>> > variables...
>>
>> AC_CONFIG_FILES is usually meant to create/prepare autoconf/automake
>> related files needed for the build process, and not to produce plain
>> package content to ship.
>>
>> Not that quoting autoconf manuals would make the autotools mess any
>> better, but there is also this. :)
>>
>> "Similarly, you should not rely on AC_CONFIG_FILES to replace bindir
>> and friends in your shell scripts and other files; instead, let make
>> manage their replacement. For instance Autoconf ships templates of its
>> shell scripts ending with ‘.in’, and uses a makefile snippet similar
>> to the following to build scripts like autoheader and autom4te:
> OK, but is there any difference for us, in the normal non-cross case?
> (I guess that make is a bit more efficient, because it parallelizes, but
> that step is tiny in any case, so the difference is most likely negligible.)
>
> I asked some more questions about the motivation for this change in
> the other branch of the thread. I'm just thinking that if there's a

what branch?

> good reason to change this for people who cross-compile, we should
> consider doing it.

Looking at it I still fail to see any problems and why one is better
than the other. The only difference is that ours expands all variables
and letting for configure they are not all expanded. There's no
difference regarding crosscompilation. Both kmod and systemd are being
crosscompiled for quite some time by yocto, buildroot, etc

I can't but think this is just to conform to other (gnome) projects.


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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Michael Biebl]

2015-03-12 23:54 GMT+01:00 Jeff Waugh :
> On Fri, Mar 13, 2015 at 8:53 AM, Zbigniew Jędrzejewski-Szmek
>  wrote:
>> So you prefer the second version to the first, right? Does not
>> exec_prefix get assigned and then substituted, leading to an identical
>> result?
>
> Those are the as-installed versions (they're not manipulated again during 
> make).

And how does that improve cross-compilation?


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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Jeff Waugh]

On Fri, Mar 13, 2015 at 8:53 AM, Zbigniew Jędrzejewski-Szmek
 wrote:
> So you prefer the second version to the first, right? Does not
> exec_prefix get assigned and then substituted, leading to an identical
> result?

Those are the as-installed versions (they're not manipulated again during make).

Here's an example from GNOME land:

  https://git.gnome.org/browse/gjs/tree/configure.ac#n232
  https://git.gnome.org/browse/gjs/tree/Makefile.am#n72

Thanks,
Jeff
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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Zbigniew Jędrzejewski-Szmek]

On Thu, Mar 12, 2015 at 11:00:55AM +0100, Kay Sievers wrote:
> On Thu, Mar 12, 2015 at 5:09 AM, Lucas De Marchi
>  wrote:
> > On Tue, Mar 10, 2015 at 3:04 PM, Jeff Waugh  wrote:
> >> Generate pkg-config files during configure as God (Havoc) intended. This 
> >> fixes
> >> all of systemd's pkg-config files when cross-compiling (and possibly other 
> >> use
> >> cases).
> 
> > Kay, please take a look on this. There's a similar patch pending to
> > kmod on [1]. I'm still not sure what exactly it's fixing... seems like
> > just that it would not replace/expand all occurrences of the
> > variables...
> 
> AC_CONFIG_FILES is usually meant to create/prepare autoconf/automake
> related files needed for the build process, and not to produce plain
> package content to ship.
> 
> Not that quoting autoconf manuals would make the autotools mess any
> better, but there is also this. :)
> 
> "Similarly, you should not rely on AC_CONFIG_FILES to replace bindir
> and friends in your shell scripts and other files; instead, let make
> manage their replacement. For instance Autoconf ships templates of its
> shell scripts ending with ‘.in’, and uses a makefile snippet similar
> to the following to build scripts like autoheader and autom4te:
OK, but is there any difference for us, in the normal non-cross case?
(I guess that make is a bit more efficient, because it parallelizes, but
that step is tiny in any case, so the difference is most likely negligible.)

I asked some more questions about the motivation for this change in
the other branch of the thread. I'm just thinking that if there's a
good reason to change this for people who cross-compile, we should
consider doing it.

Zbyszek

> 
> edit = sed \
>-e 's|@bindir[@]|$(bindir)|g' \
>-e 's|@pkgdatadir[@]|$(pkgdatadir)|g' \
>-e 's|@prefix[@]|$(prefix)|g'
> 
> autoheader autom4te: Makefile
> rm -f $@ $@.tmp
> srcdir=''; \
> test -f ./$@.in || srcdir=$(srcdir)/; \
> $(edit) $${srcdir}$@.in >$@.tmp
> chmod +x $@.tmp
> chmod a-w $@.tmp
> mv $@.tmp $@
> 
> autoheader: $(srcdir)/autoheader.in
> autom4te: $(srcdir)/autom4te.in"
> 
> http://www.gnu.org/software/autoconf/manual/autoconf.html#Installation-Directory-Variables
> 
> Kay
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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Zbigniew Jędrzejewski-Szmek]

On Thu, Mar 12, 2015 at 06:27:14PM +1100, Jeff Waugh wrote:
> On Thu, Mar 12, 2015 at 6:16 PM, Umut Tezduyar Lindskog
>  wrote:
> > What does this fix Jeff, could you please explain?
> 
> Here's the relevant part of a pkg-config file produced during make:
> 
> prefix=/usr
> exec_prefix=/usr
> libdir=/usr/lib
> includedir=/usr/include
> 
> Versus during configure:
> 
> prefix=/usr
> exec_prefix=/usr
> libdir=${exec_prefix}/lib
> includedir=${prefix}/include
> 
> Which disproportionately affects cross-compiling and similar build situations.
So you prefer the second version to the first, right? Does not
exec_prefix get assigned and then substituted, leading to an identical
result?

Zbyszek
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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Simon McVittie]

On 12/03/15 16:17, Philip Van Hoof wrote:
> I wonder if in a few years libsystemd.pc should have been
> libsystemd-1.0.pc because a libsystemd-2.0.pc became needed?

If libsystemd breaks C API, the systemd developers would just have to
declare that "libsystemd" actually meant "libsystemd API 1.0", and so is
superseded by "libsystemd API 2.0". That wouldn't be the end of the world.

It's how you name your *second* API version (i.e. not the same as the
first) that really matters :-)

> ps. In GLib this isn't being done with a cp in Makefile.am

GLib's API is expected to be long-term-stable (2.0 seems to have been
released in or before 2002), so automating the handling of API breaks
would be unnecessary effort.

Tracker switched API version on a regular basis until recently, which is
presumably why that automation was worth having.

> and yet
> other projects (dconf) don't do API versioning with the .pc filename.

If dconf never breaks API, no problem; if it does, it will hopefully
start including an API version in the .pc filename at that point.

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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Philip Van Hoof]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

On 12/03/2015 8:27, Jeff Waugh wrote:

> 
> Finally, a supporting appeal to authority: If you check
> GNOME-land, practically all pkg-config files are generated at
> configure time. :-)

Yes and no. Certain projects in the confusing land of the gnomes do
something like this:

tracker-miner-$(TRACKER_API_VERSION).pc: tracker-miner.pc
cp $< $@

to get the version in the filename of the .pc. But yes that
tracker-miner.pc gets generated at configure time.

I wonder if in a few years libsystemd.pc should have been
libsystemd-1.0.pc because a libsystemd-2.0.pc became needed?

ps. In GLib this isn't being done with a cp in Makefile.am and yet
other projects (dconf) don't do API versioning with the .pc filename.

Kind regards,

Philip
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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Michael Biebl]

2015-03-12 8:27 GMT+01:00 Jeff Waugh :
> On Thu, Mar 12, 2015 at 6:16 PM, Umut Tezduyar Lindskog
>  wrote:
>> What does this fix Jeff, could you please explain?
>
> Here's the relevant part of a pkg-config file produced during make:
>
> prefix=/usr
> exec_prefix=/usr
> libdir=/usr/lib
> includedir=/usr/include
>
> Versus during configure:
>
> prefix=/usr
> exec_prefix=/usr
> libdir=${exec_prefix}/lib
> includedir=${prefix}/include
>
> Which disproportionately affects cross-compiling and similar build situations.

Why is the configure produced .pc file better for suited for cross-compilation?
I must be missing something here.


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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Simon McVittie]

On 12/03/15 07:50, Umut Tezduyar Lindskog wrote:
> Ok! I have another problem with pc files but I solve it downstream.
> When I configure systemd with --configure=/usr and set the DESTDIR to
> my host path, the pc files don't have the DESTDIR extension. I solve
> it manually by 'sed'ding the files after installation.

.pc files intentionally do not contain the DESTDIR in their paths.
DESTDIR should never be hard-coded into any installed file, since that
would not work in situations where you have installed the headers,
libraries etc. in their intended target path /usr/include,
/usr/lib{,32,64,/MULTIARCH} etc., as is done on dpkg, rpm etc. systems.

The DESTDIR is for "staged installs" as used by dpkg/rpm. Here is a
massively oversimplified version of how dpkg packages are built:

./configure --prefix=/usr
make
make install DESTDIR=$(pwd)/debian/tmp
tar -C $(pwd)/debian/tmp -czf data.tar.gz .
# now data.tar.gz contains e.g. ./usr/bin/foo, ./usr/include/foo.h,
# ./usr/lib/i386-linux-gnu/libfoo.so*

and most other packaging systems are similar.

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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Kay Sievers]

On Thu, Mar 12, 2015 at 5:09 AM, Lucas De Marchi
 wrote:
> On Tue, Mar 10, 2015 at 3:04 PM, Jeff Waugh  wrote:
>> Generate pkg-config files during configure as God (Havoc) intended. This 
>> fixes
>> all of systemd's pkg-config files when cross-compiling (and possibly other 
>> use
>> cases).

> Kay, please take a look on this. There's a similar patch pending to
> kmod on [1]. I'm still not sure what exactly it's fixing... seems like
> just that it would not replace/expand all occurrences of the
> variables...

AC_CONFIG_FILES is usually meant to create/prepare autoconf/automake
related files needed for the build process, and not to produce plain
package content to ship.

Not that quoting autoconf manuals would make the autotools mess any
better, but there is also this. :)

"Similarly, you should not rely on AC_CONFIG_FILES to replace bindir
and friends in your shell scripts and other files; instead, let make
manage their replacement. For instance Autoconf ships templates of its
shell scripts ending with ‘.in’, and uses a makefile snippet similar
to the following to build scripts like autoheader and autom4te:

edit = sed \
   -e 's|@bindir[@]|$(bindir)|g' \
   -e 's|@pkgdatadir[@]|$(pkgdatadir)|g' \
   -e 's|@prefix[@]|$(prefix)|g'

autoheader autom4te: Makefile
rm -f $@ $@.tmp
srcdir=''; \
test -f ./$@.in || srcdir=$(srcdir)/; \
$(edit) $${srcdir}$@.in >$@.tmp
chmod +x $@.tmp
chmod a-w $@.tmp
mv $@.tmp $@

autoheader: $(srcdir)/autoheader.in
autom4te: $(srcdir)/autom4te.in"

http://www.gnu.org/software/autoconf/manual/autoconf.html#Installation-Directory-Variables

Kay
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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Umut Tezduyar Lindskog]

Ok! I have another problem with pc files but I solve it downstream.
When I configure systemd with --configure=/usr and set the DESTDIR to
my host path, the pc files don't have the DESTDIR extension. I solve
it manually by 'sed'ding the files after installation. I thought maybe
your patch solves this problem too. Thanks!


On Thu, Mar 12, 2015 at 8:27 AM, Jeff Waugh  wrote:
> On Thu, Mar 12, 2015 at 6:16 PM, Umut Tezduyar Lindskog
>  wrote:
>> What does this fix Jeff, could you please explain?
>
> Here's the relevant part of a pkg-config file produced during make:
>
> prefix=/usr
> exec_prefix=/usr
> libdir=/usr/lib
> includedir=/usr/include
>
> Versus during configure:
>
> prefix=/usr
> exec_prefix=/usr
> libdir=${exec_prefix}/lib
> includedir=${prefix}/include
>
> Which disproportionately affects cross-compiling and similar build situations.
>
> OpenWrt includes an equivalent change for kmod (which Lucas mentioned
> as I've submitted it upstream), and without an upstream change will
> have to carry one for systemd too.
>
> Finally, a supporting appeal to authority: If you check GNOME-land,
> practically all pkg-config files are generated at configure time. :-)
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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Jeff Waugh]

On Thu, Mar 12, 2015 at 6:16 PM, Umut Tezduyar Lindskog
 wrote:
> What does this fix Jeff, could you please explain?

Here's the relevant part of a pkg-config file produced during make:

prefix=/usr
exec_prefix=/usr
libdir=/usr/lib
includedir=/usr/include

Versus during configure:

prefix=/usr
exec_prefix=/usr
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Which disproportionately affects cross-compiling and similar build situations.

OpenWrt includes an equivalent change for kmod (which Lucas mentioned
as I've submitted it upstream), and without an upstream change will
have to carry one for systemd too.

Finally, a supporting appeal to authority: If you check GNOME-land,
practically all pkg-config files are generated at configure time. :-)
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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Umut Tezduyar Lindskog]

What does this fix Jeff, could you please explain?

On Tue, Mar 10, 2015 at 7:04 PM, Jeff Waugh  wrote:
> Generate pkg-config files during configure as God (Havoc) intended. This fixes
> all of systemd's pkg-config files when cross-compiling (and possibly other use
> cases).
>
> (Note: I might've missed some things to tidy up in Makefile.am, but not 100%
> sure.)
>
> Signed-off-by: Jeff Waugh 
> ---
>  Makefile.am  |  3 ---
>  configure.ac | 10 ++
>  2 files changed, 10 insertions(+), 3 deletions(-)
>
> diff --git a/Makefile.am b/Makefile.am
> index 3539e03..d2ebc81 100644
> --- a/Makefile.am
> +++ b/Makefile.am
> @@ -6442,9 +6442,6 @@ man/%: man/%.in
>  sysctl.d/%: sysctl.d/%.in
> $(SED_PROCESS)
>
> -%.pc: %.pc.in
> -   $(SED_PROCESS)
> -
>  %.conf: %.conf.in
> $(SED_PROCESS)
>
> diff --git a/configure.ac b/configure.ac
> index 29111f5..21b8008 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -1510,6 +1510,16 @@ AC_CONFIG_FILES([
>  docs/libudev/version.xml
>  docs/gudev/Makefile
>  docs/gudev/version.xml
> +src/libudev/libudev.pc
> +src/compat-libs/libsystemd-id128.pc
> +src/compat-libs/libsystemd-daemon.pc
> +src/compat-libs/libsystemd-login.pc
> +src/compat-libs/libsystemd-journal.pc
> +src/libsystemd/sd-id128/libsystemd-id128.pc
> +src/libsystemd/libsystemd.pc
> +src/udev/udev.pc
> +src/core/systemd.pc
> +src/gudev/gudev-1.0.pc
>  ])
>
>  AC_OUTPUT
> --
> 1.9.1
>
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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Lucas De Marchi]

On Tue, Mar 10, 2015 at 3:04 PM, Jeff Waugh  wrote:
> Generate pkg-config files during configure as God (Havoc) intended. This fixes
> all of systemd's pkg-config files when cross-compiling (and possibly other use
> cases).
>
> (Note: I might've missed some things to tidy up in Makefile.am, but not 100%
> sure.)
>
> Signed-off-by: Jeff Waugh 
> ---

Kay, please take a look on this. There's a similar patch pending to
kmod on [1]. I'm still not sure what exactly it's fixing... seems like
just that it would not replace/expand all occurrences of the
variables...

-- 
Lucas De Marchi


[1] http://www.spinics.net/lists/linux-modules/msg01461.html
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Re: [systemd-devel] [PATCH] build: generate pkg-config files during configure

[Jeff Waugh]

On Wed, Mar 11, 2015 at 5:04 AM, Jeff Waugh  wrote:
> Generate pkg-config files during configure as God (Havoc) intended. This fixes
> all of systemd's pkg-config files when cross-compiling (and possibly other use
> cases).

Thoughts, feelings?
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[systemd-devel] [PATCH] build: generate pkg-config files during configure

[Jeff Waugh]

Generate pkg-config files during configure as God (Havoc) intended. This fixes
all of systemd's pkg-config files when cross-compiling (and possibly other use
cases).

(Note: I might've missed some things to tidy up in Makefile.am, but not 100%
sure.)

Signed-off-by: Jeff Waugh 
---
 Makefile.am  |  3 ---
 configure.ac | 10 ++
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/Makefile.am b/Makefile.am
index 3539e03..d2ebc81 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -6442,9 +6442,6 @@ man/%: man/%.in
 sysctl.d/%: sysctl.d/%.in
$(SED_PROCESS)
 
-%.pc: %.pc.in
-   $(SED_PROCESS)
-
 %.conf: %.conf.in
$(SED_PROCESS)
 
diff --git a/configure.ac b/configure.ac
index 29111f5..21b8008 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1510,6 +1510,16 @@ AC_CONFIG_FILES([
 docs/libudev/version.xml
 docs/gudev/Makefile
 docs/gudev/version.xml
+src/libudev/libudev.pc
+src/compat-libs/libsystemd-id128.pc
+src/compat-libs/libsystemd-daemon.pc
+src/compat-libs/libsystemd-login.pc
+src/compat-libs/libsystemd-journal.pc
+src/libsystemd/sd-id128/libsystemd-id128.pc
+src/libsystemd/libsystemd.pc
+src/udev/udev.pc
+src/core/systemd.pc
+src/gudev/gudev-1.0.pc
 ])
 
 AC_OUTPUT
-- 
1.9.1

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