diff --git a/argyllcms.spec b/argyllcms.spec
index ec0de82..a7e7403 100644
--- a/argyllcms.spec
+++ b/argyllcms.spec
@@ -17,7 +17,8 @@ BuildRequires: libtiff-devel, libusb-devel
 BuildRequires: libX11-devel, libXext-devel, libXxf86vm-devel, libXinerama-devel
 BuildRequires: libXScrnSaver-devel, libXrandr-devel
 
-Requires: udev
+Requires:      udev >= 176
+Conflicts:     filesystem < 3
 
 %description
 The Argyll color management system supports accurate ICC profile creation for
@@ -52,7 +53,8 @@ This package contains the Argyll color management system documentation.
 %setup -q -n hargyllcms-%{?version}-%{?alphatag}
 # we're not allowed to refer to acquisition devices as scanners
 ./legal.sh
-
+# FIXME:
+sed -i 's#(slashlibdir)/udev/rules.d/#(prefix)/lib/udev/rules.d/#g' libusb/Makefile.*
 %build
 %configure
 make
@@ -71,7 +73,7 @@ rm -rf %{buildroot}
 %attr(0755,root,root) %{_bindir}/*
 %{_datadir}/color/argyll
 %{_datadir}/color/argyll/ref
-/lib/udev/rules.d/55-Argyll.rules
+%{_prefix}/lib/udev/rules.d/55-Argyll.rules
 
 %exclude %{_datadir}/doc