diff --git a/README.md b/README.md
index 8ab46cf..3b7a867 100644
--- a/README.md
+++ b/README.md
@@ -2,3 +2,4 @@
 
 OCamlSDL is an attempt to write a software interface between the ML (Meta Language) programming language and the SDL C library.
 The ML inplementation we have choosen is OCaml.
+
diff --git a/ocaml-sdl-0.9.1-safe-string.patch b/ocaml-sdl-0.9.1-safe-string.patch
new file mode 100644
index 0000000..7f757e9
--- /dev/null
+++ b/ocaml-sdl-0.9.1-safe-string.patch
@@ -0,0 +1,18 @@
+--- ocamlsdl-0.9.1.old/src/sdlmouse.ml	2011-04-10 16:33:52.000000000 +0100
++++ ocamlsdl-0.9.1/src/sdlmouse.ml	2017-11-18 11:24:01.989795950 +0000
+@@ -49,12 +49,12 @@
+     = "ml_SDL_Cursor_data"
+ 
+ let string_of_bits x =
+-  let s = String.make 8 ' ' in
++  let s = Bytes.make 8 ' ' in
+   for i=0 to 7 do
+     if x land (1 lsl i) <> 0
+-    then s.[7-i] <- '@'
++    then Bytes.set s (7-i) '@'
+   done ;
+-  s
++  Bytes.to_string s
+ 
+ let pprint_cursor c =
+   let { data = data ; mask = mask } = cursor_data c in
diff --git a/ocaml-sdl.spec b/ocaml-sdl.spec
index 18fd853..4de9795 100644
--- a/ocaml-sdl.spec
+++ b/ocaml-sdl.spec
@@ -2,14 +2,15 @@
 
 Name:          ocaml-sdl
 Version:       0.9.1
-Release:       2mamba
+Release:       3mamba
 Summary:       OCamlSDL is an interface between the ML programming language and the SDL C library
 Group:         Development/Bindings
 Vendor:        openmamba
 Distribution:  openmamba
-Packager:      Davide Madrisan <davide.madrisan@gmail.com>
-URL:           http://downloads.sourceforge.net/home.html
+Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
+URL:           https://sourceforge.net/create
 Source:        http://sourceforge.net/projects/ocamlsdl/files/OCamlSDL/ocamlsdl-%{version}/ocamlsdl-%{version}.tar.gz
+Patch0:        ocaml-sdl-0.9.1-safe-string.patch
 License:       LGPL
 ## AUTOBUILDREQ-BEGIN
 BuildRequires: glibc-devel
@@ -18,20 +19,17 @@ BuildRequires: libSDL_gfx-devel
 BuildRequires: libSDL_image-devel
 BuildRequires: libSDL_mixer-devel
 BuildRequires: libSDL_ttf-devel
+BuildRequires: ocaml
+BuildRequires: ocaml-runtime
 ## AUTOBUILDREQ-END
-BuildRequires: libSDL_gfx-devel >= 2.0.24
+BuildRequires: libSDL_gfx-devel >= 2.0.26
 BuildRequires: ocaml
 BuildRequires: ocaml-findlib
-BuildRoot:     %{_tmppath}/%{name}-%{version}-root
-
-# FIXME: optionam build requirement
-#        LablGL   http://wwwfun.kurims.kyoto-u.ac.jp/soft/olabl/lablgl.html
 
 %description
 OCamlSDL is an attempt to write a software interface between the ML (Meta Language) programming language and the SDL C library.
 The ML inplementation we have choosen is OCaml.
 
-## remove the following two blocks if there's no devel files
 %package devel
 Group:         Development/Libraries
 Summary:       Development files for %{name}
@@ -40,8 +38,11 @@ Requires:      %{name} = %{?epoch:%epoch:}%{version}-%{release}
 %description devel
 This package contains libraries and signature files for developing applications that use %{name}.
 
+%debug_package
+
 %prep
 %setup -q -n ocamlsdl-%{version}
+%patch0 -p1 -b .safe-string
 
 %build
 ./configure \
@@ -83,6 +84,9 @@ make install
 %doc doc/html/
 
 %changelog
+* Fri Dec 31 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 0.9.1-3mamba
+- rebuilt with libSDL_gfx 2.0.26
+
 * Mon Jul 15 2013 Silvan Calarco <silvan.calarco@mambasoft.it> 0.9.1-2mamba
 - rebuilt with libSDL_gfx 2.0.24
 - fixed specfile name