diff --git a/lincity-ng.spec b/lincity-ng.spec
index ef6cb7a..f864416 100644
--- a/lincity-ng.spec
+++ b/lincity-ng.spec
@@ -1,35 +1,38 @@
 Name:          lincity-ng
 Version:       2.0
-Release:       3mamba
+Release:       4mamba
 Summary:       A City Simulation Game
 Group:         Graphical Desktop/Applications/Games
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
-URL:           http://lincity-ng.berlios.de
+URL:           https://www.berlios.de/software/lincity-ng/
 Source:        http://download.berlios.de/lincity-ng/lincity-ng-%{version}.tar.bz2
 License:       GPL
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
-BuildRequires: libgcc
-BuildRequires: libGL-devel
 BuildRequires: libSDL-devel
 BuildRequires: libSDL_gfx-devel
 BuildRequires: libSDL_image-devel
 BuildRequires: libSDL_mixer-devel
 BuildRequires: libSDL_ttf-devel
+BuildRequires: libX11-devel
+BuildRequires: libgcc
+BuildRequires: libglvnd-devel
+BuildRequires: libphysfs-devel
 BuildRequires: libstdc++6-devel
 BuildRequires: libxml2-devel
 BuildRequires: libz-devel
-#libphysfs.so.1: library not reported by ldconfig
 ## AUTOBUILDREQ-END
 BuildRequires: libphysfs-devel
 BuildRequires: ftjam
+BuildRequires: libSDL_gfx-devel >= 2.0.26
 
 %description
 LinCity-NG is a City Simulation Game. It is a polished and improved version of the classic LinCity game. Within the scope of the GoTM project at happypenguin we have created a new iso-3D graphics engine, with a completely redone and modern GUI.
 
+%debug_package
+
 %prep
 %setup -q
 
@@ -51,9 +54,14 @@ jam install DESTDIR=%{buildroot}
 %{_datadir}/pixmaps/lincity-ng.png
 %dir %{_datadir}/lincity-ng
 %{_datadir}/lincity-ng/*
+%dir %{_docdir}/lincity-ng-%{version}
+%{_docdir}/lincity-ng-%{version}/*
 %doc COPYING README TODO
 
 %changelog
+* Fri Dec 31 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 2.0-4mamba
+- rebuilt with libSDL_gfx 2.0.26
+
 * Mon Jul 15 2013 Silvan Calarco <silvan.calarco@mambasoft.it> 2.0-3mamba
 - rebuilt with libSDL_gfx 2.0.24