diff --git a/lyx.spec b/lyx.spec
index d901018..e661a0d 100644
--- a/lyx.spec
+++ b/lyx.spec
@@ -1,6 +1,7 @@
 %define majver %(echo %version | cut -d. -f1-2)
+%define srcver %(echo %version | cut -d. -f1-3)-%(echo %version | cut -d. -f4)
 Name:          lyx
-Version:       2.3.4.4
+Version:       2.3.5.1
 Release:       1mamba
 Summary:       WYSIWYM (What You See Is What You Mean) document processor
 Group:         Applications/Publishing
@@ -8,7 +9,7 @@ Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
 URL:           http://www.lyx.org/
-Source0:       ftp://ftp.lip6.fr/pub/lyx/stable/%{majver}.x/lyx-%{version}.tar.bz2
+Source0:       ftp://ftp.lip6.fr/pub/lyx/stable/%{majver}.x/lyx-%{version}.tar.xz
 #Source0:       ftp://ftp.lyx.org/pub/lyx/stable/%{majver}.x/lyx-%{version}.tar.xz
 Source1:       lyx-desktop
 Patch0:        %{name}-2.0.0-hunspell-1.3.patch
@@ -73,11 +74,11 @@ Despite its simple GUI interface (available in many languages), it supports tabl
 %debug_package
 
 %prep
-%setup -q
+%setup -q -n %{name}-%{srcver}
 #%patch0 -p1
+./autogen.sh
 
 %build
-#./autogen.sh
 %configure \
   --enable-qt5 \
   --with-qt-dir=%{_libdir}/qt5 \
@@ -116,6 +117,9 @@ install -D -m644 %{S:1} \
 #NEWS README
 
 %changelog
+* Sun Sep 06 2020 Silvan Calarco <silvan.calarco@mambasoft.it> 2.3.5.1-1mamba
+- update to 2.3.5.1
+
 * Tue Mar 03 2020 Silvan Calarco <silvan.calarco@mambasoft.it> 2.3.4.4-1mamba
 - update to 2.3.4.4