specfile: UsrMove safeguard added

tcsh.spec

@@ -1,7 +1,7 @@
 Name:             tcsh
 Summary:          An enhanced version of csh, the C shell
 Version:          6.19.00
-Release:          14%{?dist}
+Release:          15%{?dist}
 License:          BSD
 
 URL:              http://www.tcsh.org/
@@ -11,6 +11,11 @@ Provides:         csh = %{version}
 Provides:         tcsh = %{version}
 Provides:         /bin/csh
 Provides:         /bin/tcsh
+
+# Safeguard to allow this package to be installed only on UsrMove enabled
+# filesystem. More info: https://fedoraproject.org/wiki/Features/UsrMove
+Requires:         filesystem >= 3
+
 Requires(post):   coreutils
 Requires(post):   grep
 Requires(postun): sed
@@ -195,6 +200,9 @@ fi
 
 
 %changelog
+* Tue Sep  6 2016 David Kaspar [Dee'Kej] <dkaspar@redhat.com> - 6.19.00-15
+- Add a safeguard for installation on UsrMove enabled filesystem only
+
 * Fri Aug 12 2016 David Kaspar [Dee'Kej] <dkaspar@redhat.com> - 6.19.00-14
 - Move the COPYING file to correct location