[bug#50201] [PATCH 35/52] gnu: avahi: Find 'TARGET-pkg-config' when cross-compiling.

[Maxime Devos]

The configure script first tests whether "pkg-config" is in PATH,
and then uses "TARGET-pkg-config".  Pretend "pkg-config" exists.

* gnu/packages/avahi.scm (avah)[arguments]<#:configure-flags>: Set
  ac_cv_prog_have_pkg_config=yes when cross-compiling.
---
 gnu/packages/avahi.scm | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/avahi.scm b/gnu/packages/avahi.scm
index 602f9d7997..5582df479e 100644
--- a/gnu/packages/avahi.scm
+++ b/gnu/packages/avahi.scm
@@ -3,6 +3,7 @@
 ;;; Copyright © 2014 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2018 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2020 Marius Bakke <mbakke@fastmail.com>
+;;; Copyright © 2021 Maxime Devos <maximedevos@telenet.be>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -58,7 +59,7 @@
                  #t))))
     (build-system gnu-build-system)
     (arguments
-     '(#:configure-flags '("--with-distro=none"
+     `(#:configure-flags '("--with-distro=none"
                            "--disable-static"
                            "--localstatedir=/var" ; for the DBus socket
                            "--disable-python"
@@ -68,7 +69,10 @@
                            "--enable-tests"
                            "--disable-qt4" "--disable-qt5"
                            "--disable-gtk" "--disable-gtk3"
-                           "--enable-compat-libdns_sd")))
+                           "--enable-compat-libdns_sd"
+                           ,@(if (%current-target-system)
+                                 '("ac_cv_prog_have_pkg_config=yes")
+                                 '()))))
     (inputs
      `(("dbus" ,dbus)
        ("expat" ,expat)
-- 
2.33.0