diff --git a/CMakeLists.txt b/CMakeLists.txt
index b3e50e1..16fe24e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,7 +20,7 @@
 ########################################################################
 # Project setup
 ########################################################################
-cmake_minimum_required(VERSION 3.1 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.0 FATAL_ERROR)
 project(gr-satnogs CXX C)
 enable_testing()
 
diff --git a/lib/coarse_doppler_correction_cc_impl.cc b/lib/coarse_doppler_correction_cc_impl.cc
index 5442782..025fbc9 100644
--- a/lib/coarse_doppler_correction_cc_impl.cc
+++ b/lib/coarse_doppler_correction_cc_impl.cc
@@ -49,7 +49,7 @@ namespace gr
 			    gr::io_signature::make (1, 1, sizeof(gr_complex))),
 	    d_target_freq (target_freq),
 	    d_samp_rate (sampling_rate),
-	    d_buf_items (std::min (8192UL, (size_t) (d_samp_rate / 4))),
+	    d_buf_items (std::min ((size_t)8192UL, (size_t) (d_samp_rate / 4))),
 	    d_freq_diff (0),
 	    d_nco ()
     {
diff --git a/python/hw_settings.py b/python/hw_settings.py
index 171bf87..730b463 100644
--- a/python/hw_settings.py
+++ b/python/hw_settings.py
@@ -44,4 +44,7 @@ hw_rx_settings = {'usrpb200' : {'rf_gain' : 20.0, 'if_gain' : 0.0,
                               'antenna' : '', 'dev_arg': 'airspy'},
                   'hackrf' : {'rf_gain' : 20.0, 'if_gain' : 8.0,
                               'bb_gain' : 5.0, 'samp_rate' : 2e6,
-                              'antenna' : '', 'dev_arg': 'hackrf'} }
+                              'antenna' : '', 'dev_arg': 'hackrf'},
+                  'rtlsdr' : {'rf_gain' : 32.0, 'if_gain' : 0.0,
+                              'bb_gain' : 0.0, 'samp_rate' : 1.024e6,
+                              'antenna' : '', 'dev_arg' : 'rtl'} }