Description of problem: imseetings build failed with following error:
error: Installed (but unpackaged) file(s) found:
   /usr/lib64/imsettings/libimsettings-gconf.so

This happens when GConf2 is not installed

Version-Release number is imsettings-1.6.7

check you don't have GConf2 installed and run a build command like
rpmbuild -ba ...


For info, I bypassed the problem by changing the spec file like:
--- imsettings.spec.ori
+++ imsettings.spec
@@ -30,6 +30,11 @@ Requires:    %{name}-desktop-module%{?_isa}
 Requires(post):        /bin/dbus-send %{_sbindir}/alternatives
 Requires(postun):      /bin/dbus-send %{_sbindir}/alternatives

+# Detect gconf installation
+%if %(test -f /usr/lib64/pkgconfig/gconf-2.0.pc && echo 1 || echo 0)
+%define GConf 1
+%endif
+
 %description
 IMSettings is a framework that delivers Input Method
 settings and applies the changes so they take effect
@@ -267,6 +272,9 @@ fi
 %files libs
 %doc AUTHORS COPYING ChangeLog NEWS README
 %{_libdir}/libimsettings.so.*
+%if %{defined GConf}
+%{_libdir}/imsettings/libimsettings-gconf.so
+%endif

 %files devel
 %doc AUTHORS COPYING ChangeLog NEWS README