diff --git a/FlightGear-2020.3.9-aarch64-rpi.patch b/FlightGear-2020.3.9-aarch64-rpi.patch
new file mode 100644
index 0000000..1c255b7
--- /dev/null
+++ b/FlightGear-2020.3.9-aarch64-rpi.patch
@@ -0,0 +1,11 @@
+--- flightgear-2020.3.9/utils/fgpanel/CMakeLists.txt	2021-06-10 15:16:55.000000000 +0100
++++ flightgear-2020.3.9.patched/utils/fgpanel/CMakeLists.txt	2021-07-05 21:16:21.391728643 +0100
+@@ -117,7 +117,7 @@
+     SimGearCore
+     ${PNG_LIBRARIES}
+     ${FREETYPE_LIBRARIES}
+-    -lbrcmGLESv2 -lbrcmEGL -lm -lbcm_host -L/opt/vc/lib
++    -lGLESv2 -lEGL -lm -lvchostif -lbcm_host -L/opt/vc/lib
+     )
+ 
+   target_compile_definitions(fgpanel-egl PUBLIC
diff --git a/FlightGear.spec b/FlightGear.spec
index e5bd7de..a549ce4 100644
--- a/FlightGear.spec
+++ b/FlightGear.spec
@@ -1,7 +1,7 @@
 %define majver %(echo %version | cut -d. -f1-2)
 Name:          FlightGear
 Version:       2020.3.9
-Release:       1mamba
+Release:       2mamba
 Summary:       Flight Simulator
 Group:         Graphical Desktop/Applications/Games
 Vendor:        openmamba
@@ -9,16 +9,13 @@ Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
 URL:           https://www.flightgear.org/
 Source0:	   https://downloads.sourceforge.net/project/flightgear/release-%{majver}/flightgear-%{version}.tar.bz2
-#Source0:       http://mirrors.ibiblio.org/pub/mirrors/flightgear/ftp/Source/flightgear-%{version}.tar.bz2
 Source1:	   https://downloads.sourceforge.net/project/flightgear/release-%{majver}/FlightGear-%{version}-data.txz
-#Source1:       http://mirrors.ibiblio.org/pub/mirrors/flightgear/ftp/Shared/%{name}-data-%{majver}.0.tar.bz2
 Source2:       flight.png
 Patch0:        FlightGear-3.4.0-fgviewer-find-lX11.patch
+Patch1:        FlightGear-2020.3.9-aarch64-rpi.patch
 License:       GPL
 ## AUTOBUILDREQ-BEGIN
-BuildRequires: OpenSceneGraph
 BuildRequires: glibc-devel
-BuildRequires: libGL-devel
 BuildRequires: libGLU-devel
 BuildRequires: libICE-devel
 BuildRequires: libSM-devel
@@ -33,20 +30,23 @@ BuildRequires: libfreeglut-devel
 BuildRequires: libfreetype-devel
 BuildRequires: libgcc
 BuildRequires: libglew-devel
+BuildRequires: libglvnd-devel
 BuildRequires: libgsm-devel
 BuildRequires: liblzma-devel
 BuildRequires: libopenal-devel
+BuildRequires: libosg-devel
 BuildRequires: libplib-devel
 BuildRequires: libpng-devel
 BuildRequires: libqt5-devel
 BuildRequires: libspeex-devel
+BuildRequires: libspeexdsp-devel
 BuildRequires: libstdc++6-devel
 BuildRequires: libudev-devel
 BuildRequires: libz-devel
 ## AUTOBUILDREQ-END
-BuildRequires: libSimGear-devel >= %{version}
+BuildRequires: libSimGear-devel >= %{version}-2mamba
 BuildRequires: libfltk-devel >= 1.3.3-2mamba
-BuildRequires: OpenSceneGraph >= 3.4.0
+BuildRequires: libosg-devel >= 3.6.5
 Requires:      %{name}-data
 Requires:      alsa-oss
 
@@ -66,6 +66,7 @@ This package contains maps and scenary for FlightGear.
 #% setup -q -n flightgear-%{version} -D -T
 #:<< _EOF
 #%patch0 -p1
+%patch1 -p1
 
 %build
 %cmake -d build \
@@ -111,6 +112,9 @@ install -D -m0755 ./build/src/GUI/libfgqmluid.so %{buildroot}%{_libdir}/libfgqml
 %{_libdir}/%{name}/*
 
 %changelog
+* Tue Jun 22 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 2020.3.9-2mamba
+- rebuilt with OpenSceneGraph 3.6.5
+
 * Sat Jun 19 2021 Automatic Build System <autodist@mambasoft.it> 2020.3.9-1mamba
 - automatic version update by autodist