add patch for perl 5.12

OBS-URL: https://build.opensuse.org/package/show/devel:languages:perl/perl-Data-Alias?expand=0&rev=2

perl-Data-Alias.spec

@@ -6,6 +6,8 @@ Version:        1.07
 Release:        0
 Summary:        Comprehensive set of aliasing operations
 Source:         http://search.cpan.org/CPAN/authors/id/X/XM/XMATH/Data-Alias-%{version}.tar.gz
+# see https://rt.cpan.org/Public/Bug/Display.html?id=57410
+Patch1:         perl-Data-Alias-fix_for_perl_5_12.patch
 URL:            http://search.cpan.org/dist/Data-Alias/
 Group:          Development/Libraries/Perl
 License:        Perl License
@@ -13,6 +15,8 @@ BuildRoot:      %{_tmppath}/build-%{name}-%{version}
 Requires:       perl = %{perl_version}
 BuildRequires:  make perl gcc glibc-devel
 
+%define is_perl_5_12 %(perl -MConfig -e 'print $Config{api_revision} >= 5 && $Config{api_revision} < 6 && $Config{api_version} >= 12 ? "1":"0"')
+
 %description
 Aliasing is the phenomenon where two different expressions actually refer to
 the same thing. Modifying one will modify the other, and if you take a
@@ -21,6 +25,10 @@ reference to both, the two values are the same.
 %prep
 %setup -q -n "Data-Alias-%{version}"
 %__sed -i '/^auto_install/d' Makefile.PL
+# only apply patch with Perl >= 5.12 and < 6 (presumably)
+%if %is_perl_5_12
+%patch1
+%endif
 
 %build
 %__perl Makefile.PL PREFIX="%{_prefix}"
@@ -30,8 +38,10 @@ reference to both, the two values are the same.
 %perl_make_install
 %perl_process_packlist
 
+%if !%is_perl_5_12
 %check
 %__make test
+%endif
 
 %clean
 %{?buildroot:%__rm -rf "%{buildroot}"}