[tor-bugs] #31922 [Core Tor/Tor]: Recommend pkg-config when systemd fails

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#31922: Recommend pkg-config when systemd fails
-----------------------------------------+---------------------------------
 Reporter:  teor                         |          Owner:  teor
     Type:  defect                       |         Status:  assigned
 Priority:  Medium                       |      Milestone:  Tor:
                                         |  0.4.2.x-final
Component:  Core Tor/Tor                 |        Version:  Tor:
                                         |  0.4.0.1-alpha
 Severity:  Normal                       |     Resolution:
 Keywords:  042-should, regression, doc  |  Actual Points:
Parent ID:  #28993                       |         Points:
 Reviewer:                               |        Sponsor:
-----------------------------------------+---------------------------------
Description changed by teor:

Old description:

> We used to show an error like this when configure failed to find systemd:
>
> {{{
> configure: error: Package requirements (systemd >= 209) were not met:
> No package 'systemd' found
> Consider adjusting the PKG_CONFIG_PATH environment variable if you
> installed software in a non-standard prefix.
> Alternatively, you may set the environment variables SYSTEMD209_CFLAGS
> and SYSTEMD209_LIBS to avoid the need to call pkg-config. See the pkg-
> config man page for more details.
> }}}
>
> But now we don't:
> {{{
> checking for SYSTEMD... no
> configure: Okay, checking for systemd a different way...
> checking for SYSTEMD... no
> configure: error: Explicitly requested systemd support, but systemd not
> found
> }}}
>
> This issue also affects lzma, and any other package that requires pkg-
> config.
>
> In fact, lzma silently fails:
>
>   ./configure --enable-lzma silently fails if pkg-config is not
> installed:
> ​  https://gitlab.com/eighthave/tor/pipelines/85811623

New description:

 We used to show an error like this when configure failed to find systemd:

 {{{
 configure: error: Package requirements (systemd >= 209) were not met:
 No package 'systemd' found
 Consider adjusting the PKG_CONFIG_PATH environment variable if you
 installed software in a non-standard prefix.
 Alternatively, you may set the environment variables SYSTEMD209_CFLAGS and
 SYSTEMD209_LIBS to avoid the need to call pkg-config. See the pkg-config
 man page for more details.
 }}}

 But now we don't:
 {{{
 checking for pkg-config... no
 checking for SYSTEMD... no
 configure: Okay, checking for systemd a different way...
 checking for SYSTEMD... no
 configure: error: Explicitly requested systemd support, but systemd not
 found
 }}}

 This issue also affects lzma, and any other package that requires pkg-
 config.

 In fact, lzma silently fails:

   ./configure --enable-lzma silently fails if pkg-config is not installed:
 ​  https://gitlab.com/eighthave/tor/pipelines/85811623

--

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31922#comment:6>
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