Break build cycle

perl-PkgConfig-LibPkgConf.spec

@@ -1,6 +1,11 @@
+# Locate pkgconfig using Alien::pkgconf.
+# Disabled by default because it creates a build cycle (perl-Alien-pkgconf →
+# perl-Alien-Build → perl-PkgConfig-LibPkgConf).
+%bcond_with perl_PkgConfig_LibPkgConf_enables_Alien_pkgconf
+
 Name:           perl-PkgConfig-LibPkgConf
 Version:        0.11
-Release:        4%{?dist}
+Release:        5%{?dist}
 Summary:        Interface to pkg-config files via libpkgconf
 License:        GPL+ or Artistic
 URL:            https://metacpan.org/release/PkgConfig-LibPkgConf
@@ -12,9 +17,14 @@ BuildRequires:  perl-devel
 BuildRequires:  perl-generators
 BuildRequires:  perl-interpreter
 BuildRequires:  perl(:VERSION) >= 5.8.1
+%if %{with perl_PkgConfig_LibPkgConf_enables_Alien_pkgconf}
 # Use Alien::pkgconf instead of some complicated guess
 # script/cc_wrapper.pl and script/ld_wrapper.pl not used with Alien::pkgconf
 BuildRequires:  perl(Alien::pkgconf) >= 0.12
+%else
+# script/cc_wrapper.pl and script/ld_wrapper.pl not used with pkgconf
+BuildRequires:  pkgconf
+%endif
 BuildRequires:  pkgconfig(libpkgconf) >= 1.5.0
 BuildRequires:  perl(Config)
 BuildRequires:  perl(ExtUtils::MakeMaker) >= 6.98
@@ -50,6 +60,7 @@ files. This package provides a Perl-level API using libpkgconf to these files.
 
 %build
 unset FFI_PLATYPUS_DEBUG
+export PKG_CONFIG=%{_bindir}/pkgconf
 perl Makefile.PL INSTALLDIRS=vendor NO_PACKLIST=1 NO_PERLLOCAL=1 OPTIMIZE="$RPM_OPT_FLAGS"
 %{make_build}
 
@@ -69,6 +80,10 @@ make test
 %{_mandir}/man3/*
 
 %changelog
+* Tue Mar 23 2021 Petr Pisar <ppisar@redhat.com> - 0.11-5
+- Break build cycle (perl-Alien-pkgconf → perl-Alien-Build
+  → perl-PkgConfig-LibPkgConf)
+
 * Wed Jan 27 2021 Fedora Release Engineering <releng@fedoraproject.org> - 0.11-4
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild