diff --git a/arduino.spec b/arduino.spec
index d40e0df..9343fc0 100644
--- a/arduino.spec
+++ b/arduino.spec
@@ -2,7 +2,7 @@
 %define        longversion  %(echo 0%version | tr -d .)
 
 Name:          arduino
-Version:       1.8.15
+Version:       1.8.16
 Release:       1mamba
 Summary:       The open-source Arduino environment
 Group:         Graphical Desktop/Applications/Development
@@ -19,6 +19,10 @@ Patch1:        arduino-1.0-use_system_rxtx.patch
 Patch2:        arduino-1.0-etc.patch
 License:       GPL
 ## AUTOBUILDREQ-BEGIN
+#libdl.so.2()(64bit): /usr/lib64/libdl.so: file not owned by any package
+#libdl.so.2(GLIBC_2.2.5)(64bit): /usr/lib64/libdl.so: file not owned by any package
+#librt.so.1()(64bit): /usr/lib64/librt.so: file not owned by any package
+#librt.so.1(GLIBC_2.2.5)(64bit): /usr/lib64/librt.so: file not owned by any package
 BuildRequires: glibc-devel
 BuildRequires: libgcc
 BuildRequires: libstdc++6-devel
@@ -86,9 +90,9 @@ cp -a hardware lib libraries examples %{buildroot}%{_datadir}/arduino/
 #rm %{buildroot}%{_datadir}/arduino/lib/*.jar
 #rm -r %{buildroot}%{_datadir}/arduino/hardware/tools
 
-mkdir -p %{buildroot}%{_defaultdocdir}/arduino-%{version}
-cp -a reference %{buildroot}%{_defaultdocdir}/arduino-%{version}/
-ln -s %{_defaultdocdir}/arduino-%{version}/reference %{buildroot}%{_datadir}/arduino/reference
+#mkdir -p %{buildroot}%{_defaultdocdir}/arduino-%{version}
+#cp -a reference %{buildroot}%{_defaultdocdir}/arduino-%{version}/
+#ln -s %{_defaultdocdir}/arduino-%{version}/reference %{buildroot}%{_datadir}/arduino/reference
 
 # Requested upstream in http://github.com/arduino/Arduino/pull/4:
 find %{buildroot} -type f -iname '*.jpg' -or -iname '*.java' -or -iname '*.pde' -or -iname '*.h' -or -iname '*.cpp' -or -iname '*.c' -or -iname '*.txt' -or -iname 'makefile' -or -iname 'key*.txt' -or -iname 'pref*.txt' | xargs chmod -x;
@@ -117,9 +121,12 @@ done
 %{_datadir}/applications/*
 %{_datadir}/icons/hicolor/*/apps/*.png
 %{_mandir}/man1/arduino.*
-%doc %{_defaultdocdir}/arduino-%{version}/reference
+#%doc %{_defaultdocdir}/arduino-%{version}/reference
 
 %changelog
+* Sun Sep 12 2021 Automatic Build System <autodist@mambasoft.it> 1.8.16-1mamba
+- automatic version update by autodist
+
 * Wed May 19 2021 Automatic Build System <autodist@mambasoft.it> 1.8.15-1mamba
 - automatic version update by autodist