diff --git a/synthv1.spec b/synthv1.spec
index d130b80..41dabd4 100644
--- a/synthv1.spec
+++ b/synthv1.spec
@@ -1,7 +1,7 @@
 Summary:       A 4-oscillator subtractive polyphonic synthesizer
 Name:          synthv1
 Version:       0.9.13
-Release:       1%{?dist}
+Release:       2%{?dist}
 URL:           https://%{name}.sourceforge.io/
 Source0:       https://downloads.sourceforge.net/%{name}/%{name}-%{version}.tar.gz
 # Do not strip executables
@@ -18,6 +18,7 @@ BuildRequires: lv2-devel >= 1.2.0
 BuildRequires: desktop-file-utils
 BuildRequires: libsndfile-devel
 BuildRequires: liblo-devel
+BuildRequires: libappstream-glib
 
 %description
 %{name} is a 4-oscillator subtractive polyphonic synthesizer with stereo fx.
@@ -32,6 +33,12 @@ An LV2 plugin of the synthv1 subtractive synthesizer
 %prep
 %autosetup -p1
 
+# Remove cruft from appdata file
+pushd src/appdata
+iconv -f utf-8 -t ascii//IGNORE -o tmpfile %{name}.appdata.xml 2>/dev/null || :
+mv -f tmpfile %{name}.appdata.xml
+popd
+
 %build
 %configure
 %make_build
@@ -39,10 +46,10 @@ An LV2 plugin of the synthv1 subtractive synthesizer
 %install
 %make_install
 chmod +x %{buildroot}%{_libdir}/lv2/%{name}.lv2/%{name}.so
-install -m 0644 src/%{name}.desktop %{buildroot}%{_datadir}/applications/%{name}.desktop
 
 %check
 desktop-file-validate %{buildroot}%{_datadir}/applications/%{name}.desktop
+appstream-util validate-relax --nonet %{buildroot}%{_metainfodir}/%{name}.appdata.xml
 
 %files
 %doc AUTHORS README
@@ -52,7 +59,7 @@ desktop-file-validate %{buildroot}%{_datadir}/applications/%{name}.desktop
 %{_bindir}/%{name}_jack
 %{_datadir}/mime/packages/%{name}.xml
 %{_datadir}/man/man1/%{name}*
-%{_datadir}/metainfo/%{name}.appdata.xml
+%{_metainfodir}/%{name}.appdata.xml
 
 %files -n lv2-%{name}
 %doc AUTHORS README
@@ -60,6 +67,10 @@ desktop-file-validate %{buildroot}%{_datadir}/applications/%{name}.desktop
 %{_libdir}/lv2/%{name}.lv2/
 
 %changelog
+* Mon Apr 20 2020 Guido Aulisi <guido.aulisi@gmail.com> - 0.9.13-2
+- Validate AppData
+- Add missing BR for g++
+
 * Sat Apr 18 2020 Guido Aulisi <guido.aulisi@gmail.com> - 0.9.13-1
 - Update to 0.9.13
 - Some spec cleanup