diff --git a/install.sh b/install.sh
index f52da38..e0281d3 100755
--- a/install.sh
+++ b/install.sh
@@ -12,7 +12,7 @@ fi
 
 sudo apt-get update
 sudo apt-get build-dep gnuradio
-sudo apt-get install gnuradio gnuradio-dev gr-osmosdr librtlsdr-dev libuhd-dev  libhackrf-dev libitpp-dev libpcap-dev cmake git swig
+sudo apt-get install gnuradio gnuradio-dev gr-osmosdr librtlsdr-dev libuhd-dev  libhackrf-dev libitpp-dev libpcap-dev cmake git swig build-essential pkg-config doxygen
 
 mkdir build
 cd build
diff --git a/op25/gr-op25_repeater/lib/p25_frame_assembler_impl.cc b/op25/gr-op25_repeater/lib/p25_frame_assembler_impl.cc
index dba0aa9..9d5515d 100644
--- a/op25/gr-op25_repeater/lib/p25_frame_assembler_impl.cc
+++ b/op25/gr-op25_repeater/lib/p25_frame_assembler_impl.cc
@@ -39,12 +39,12 @@ namespace gr {
 
     void p25_frame_assembler_impl::p25p2_queue_msg(int duid)
     {
-	static const char wbuf[2] = {0xff, 0xff}; // dummy NAC
+	static const unsigned char wbuf[2] = {0xff, 0xff}; // dummy NAC
 	if (!d_do_msgq)
 		return;
 	if (d_msg_queue->full_p())
 		return;
-	gr::message::sptr msg = gr::message::make_from_string(std::string(wbuf, 2), duid, 0, 0);
+	gr::message::sptr msg = gr::message::make_from_string(std::string((const char *)wbuf, 2), duid, 0, 0);
 	d_msg_queue->insert_tail(msg);
     }