[tor-bugs] #31922 [Community/Relays]: Recommend systemd

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#31922: Recommend systemd
---------------------------------+-----------------------------------------
     Reporter:  teor             |      Owner:  Nusenu
         Type:  defect           |     Status:  new
     Priority:  Medium           |  Milestone:  Tor: 0.4.2.x-final
    Component:                   |    Version:  Tor: 0.4.0.1-alpha
  Community/Relays               |
     Severity:  Normal           |   Keywords:  042-should, regression, doc
Actual Points:                   |  Parent ID:  #28993
       Points:                   |   Reviewer:
      Sponsor:                   |
---------------------------------+-----------------------------------------
 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

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31922>
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