Control optional test with a macro

perl-YAML-Syck.spec

@@ -1,3 +1,10 @@
+# Run optional test
+%if ! 0%{?rhel}
+%bcond_without perl_YAML_Syck_enables_optional_test
+%else
+%bcond_with perl_YAML_Syck_enables_optional_test
+%endif
+
 Name:           perl-YAML-Syck
 Version:        1.30
 Release:        5%{?dist}
@@ -32,9 +39,11 @@ BuildRequires:  perl(IO::File)
 BuildRequires:  perl(Storable)
 BuildRequires:  perl(Test::More)
 BuildRequires:  perl(Tie::Hash)
+%if %{with perl_YAML_Syck_enables_optional_test}
 # Optional tests
 BuildRequires:  perl(Devel::Leak)
 BuildRequires:  perl(JSON)
+%endif
 # Dependencies
 Requires:       perl(:MODULE_COMPAT_%(eval "`perl -V:version`"; echo $version))
 Requires:       perl(XSLoader)