Adjust lua version computaion to SRPM build root without lua

rrdtool.spec

@@ -17,7 +17,7 @@
 Summary: Round Robin Database Tool to store and display time-series data
 Name: rrdtool
 Version: 1.6.0
-Release: 5%{?dist}
+Release: 6%{?dist}
 License: GPLv2+ with exceptions
 Group: Applications/Databases
 URL: http://oss.oetiker.ch/rrdtool/
@@ -155,7 +155,9 @@ The %{name}-ruby package includes RRDtool bindings for Ruby.
 Summary: Lua RRDtool bindings
 Group: Development/Languages
 BuildRequires: lua, lua-devel
+%if "%{luaver}" != ""
 Requires: lua(abi) = %{luaver}
+%endif
 Requires: %{name} = %{version}-%{release}
 
 %description lua
@@ -393,6 +395,9 @@ LD_LIBRARY_PATH=%{buildroot}%{_libdir} php -n \
 %endif
 
 %changelog
+* Fri Jul 29 2016 Petr Pisar <ppisar@redhat.com> - 1.6.0-6
+- Adjust lua version computaion to SRPM build root without lua
+
 * Tue Jul 19 2016 Fedora Release Engineering <rel-eng@lists.fedoraproject.org> - 1.6.0-5
 - https://fedoraproject.org/wiki/Changes/Automatic_Provides_for_Python_RPM_Packages