Following https://fedoraproject.org/wiki/EPEL:Packaging#The_.25license_tag

pngquant.spec

@@ -1,16 +1,11 @@
 # add some speed-relevant compiler-flags
 %global optflags %(echo %{optflags} -fno-math-errno -funroll-loops -fomit-frame-pointer -fPIC )
 
-# we use %%license on recent distros, only
-%if 0%{?fedora} >= 22 || 0%{?rhel} >= 8
-%global with_license 1
-%endif # 0%%{?fedora} >= 22 || 0%%{?rhel} >= 8
-
 %global libname libimagequant
 
 Name:       pngquant
 Version:    2.5.2
-Release:    4%{?dist}
+Release:    5%{?dist}
 Summary:    PNG quantization tool for reducing image file size
 
 License:    BSD with advertising
@@ -115,21 +110,17 @@ popd
 
 
 %files
+# EPEL6 support https://fedoraproject.org/wiki/EPEL:Packaging#The_.25license_tag
+%{!?_licensedir:%global license %doc}
 %doc README.md CHANGELOG
-%if 0%{?with_license}
 %license COPYRIGHT
-%else  # 0%%{?with_license}
-%doc COPYRIGHT
-%endif # 0%%{?with_license}
 %{_bindir}/%{name}
 %{_mandir}/man1/%{name}.1*
 
 %files -n %{libname}
-%if 0%{?with_license}
+# EPEL6 support https://fedoraproject.org/wiki/EPEL:Packaging#The_.25license_tag
+%{!?_licensedir:%global license %doc}
 %license lib/COPYRIGHT
-%else  # 0%%{?with_license}
-%doc lib/COPYRIGHT
-%endif # 0%%{?with_license}
 %{_libdir}/%{libname}.so.*
 
 %files -n %{libname}-devel
@@ -139,6 +130,9 @@ popd
 
 
 %changelog
+* Sat Dec 19 2015 Sérgio Basto <sergio@serjux.com> - 2.5.2-5
+- Following https://fedoraproject.org/wiki/EPEL:Packaging#The_.25license_tag
+
 * Sat Dec 19 2015 Björn Esser <fedora@besser82.io> - 2.5.2-4
 - Add '-std=c99' for building the testsuite binary