diff --git a/portreserve.spec b/portreserve.spec
index 13427e9..b226029 100644
--- a/portreserve.spec
+++ b/portreserve.spec
@@ -8,6 +8,8 @@ URL: http://cyberelk.net/tim/portreserve/
 Source0: http://cyberelk.net/tim/data/portreserve/stable/%{name}-%{version}.tar.bz2
 Source1: portreserve.service
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
+Conflicts: filesystem < 3
+Conflicts: systemd < 38
 Requires(post): systemd-units
 Requires(preun): systemd-units
 Requires(postun): systemd-units
@@ -31,7 +33,7 @@ port (generally in the init script).
 %setup -q
 
 %build
-%configure --sbindir=/sbin
+%configure
 make
 
 %install
@@ -86,7 +88,7 @@ fi
 %dir %{_sysconfdir}/portreserve
 %config %{_sysconfdir}/tmpfiles.d/portreserve.conf
 %{_unitdir}/portreserve.service
-/sbin/*
+%{_sbindir}/*
 %{_mandir}/*/*
 
 %changelog