use if "%{_libdir}" == "/usr/lib64"

fakechroot.spec

@@ -1,6 +1,6 @@
 Name:           fakechroot
 Version:        2.20.1
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Gives a fake chroot environment
 License:        LGPLv2+
 URL:            https://github.com/dex4er/fakechroot
@@ -38,15 +38,11 @@ chmod -x scripts/{relocatesymlinks,restoremode,savemode}.sh
 %build
 autoreconf -vfi
 
-%ifnarch noarch
-%if 0%{__isa_bits} == 64
+%if "%{_libdir}" == "/usr/lib64"
 %configure --disable-static --disable-silent-rules --with-libpath="%{_libdir}/fakechroot:/usr/lib/fakechroot"
 %else
 %configure --disable-static --disable-silent-rules --with-libpath="%{_libdir}/fakechroot"
 %endif
-%else
-%configure --disable-static --disable-silent-rules --with-libpath="%{_libdir}/fakechroot"
-%endif
 
 %make_build
 
@@ -76,6 +72,9 @@ find %{buildroot}%{_libdir} -name '*.la' -delete -print
 %{_libdir}/%{name}/
 
 %changelog
+* Wed Feb 12 2020 Sérgio Basto <sergio@serjux.com> - 2.20.1-4
+- Use if "%{_libdir}" == "/usr/lib64" instead %if 0%{__isa_bits} == 64
+
 * Tue Jan 28 2020 Fedora Release Engineering <releng@fedoraproject.org> - 2.20.1-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_32_Mass_Rebuild