diff --git a/install-gr3.9.sh b/install-gr3.9.sh
index 1122c77..bb90890 100755
--- a/install-gr3.9.sh
+++ b/install-gr3.9.sh
@@ -16,9 +16,7 @@ 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 build-essential pkg-config doxygen python3-numpy python3-waitress python3-requests python3-pip pybind11-dev
-
-pip3 install --user pygccxml
+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 python3-numpy python3-waitress python3-requests python3-pip pybind11-dev clang-format libsndfile1-dev
 
 # setup and populate gr3.9 src tree
 echo