diff --git a/OAR/contrib/build.rtems.4.11.sh b/OAR/contrib/build.rtems.4.11.sh
new file mode 100755
index 0000000000000000000000000000000000000000..4b5350c64a3dd68d2c111ea4b8719b6834ac15ff
--- /dev/null
+++ b/OAR/contrib/build.rtems.4.11.sh
@@ -0,0 +1,102 @@
+#!/bin/bash
+#
+# This script builds the RTEMS4.11/Sparc cross-compiler
+# and Leon2/3 BSPs.
+#
+# To have a reproducible setup, we suggest you execute
+# this script under a Debian jessie chroot, bootstrapped
+# via the following:
+#
+#     mkdir /opt/jessie-chroot
+#     debootstrap jessie /opt/jessie-chroot
+#     mount -t proc none /opt/jessie-chroot/proc/
+#     mount -t sysfs none /opt/jessie-chroot/sys/
+#     mount -o bind /dev /opt/jessie-chroot/dev/
+#     mount -o bind /dev/pts /opt/jessie-chroot/dev/pts/
+#     chroot /opt/jessie-chroot
+#     apt-get update
+#     apt-get build-dep binutils gcc g++ gdb unzip git python2.7-dev pax
+#
+# Then chroot inside it and run this script:
+#
+#     chroot /opt/jessie-chroot
+#     /path/to/build.rtems.4.11.sh
+
+
+# Stop on any error
+set -e
+
+DATE=$(date +"%Y.%m.%d")
+mkdir -p /root/rtems.build.logs
+BUILD_LOG=/root/rtems.build.logs/${DATE}.log
+[ -f ${BUILD_LOG} ] && {
+    echo "There's already a build log:"
+    echo "    " ${BUILD_LOG}
+    echo Remove it to continue.
+    exit 1
+}
+
+# Record the output in $BUILD_LOG (see matching brace)
+{
+    # Begin by checking out the RTEMS Source Builder
+    mkdir -p /root/development/rtems/src
+    RSB=/root/development/rtems/src/rtems-source-builder-${DATE}
+    RTPREFIX=/opt/rtems-4.11-${DATE}
+    rm -rf ${RTPREFIX}
+    [ ! -d $RSB ] && {
+        cd /root/development/rtems/src/
+        git clone git://git.rtems.org/rtems-source-builder.git rtems-source-builder-${DATE}
+    }
+    cd $RSB
+    git checkout -f 4.11
+
+    # Verify that we have all we need to build
+    source-builder/sb-check
+
+    # Your network firewall may or may not be an issue at this point:
+    # Many of the source tarballs needed by the RSB are fetched over
+    # PASV-enabled FTP servers.
+    # If your network is like the one in ESA/ESTEC and this is forbidden,
+    # you'll have to fetch these tarballs and hardlink to them each time
+    # (so no FTP action is triggered by the RTEMS RSB builder).
+    # This is how I do it - adapt according to your needs:
+    #
+    # cd rtems
+    # [ ! -d sources ] && {
+    #     mkdir -p sources
+    #     cd sources
+    #     cp -al /root/development/rtems/src/rtems-source-builder.working/rtems/sources/* .
+    #     cd ..
+    #     for i in config/tools/*cfg ; do
+    #         cat "$i" | sed 's,ftp://ftp.gnu.org,http://ftp.gnu.org,;s,ftp://gcc.gnu.org,http://gcc.gnu.org,;' > "$i".new && mv "$i".new "$i"
+    #     done
+    # }
+
+    # Build the cross compiler
+    # (we're in the master branch, which is currently the "unofficial" 4.11)
+    ../source-builder/sb-set-builder --log=stage1.log --prefix=${RTPREFIX} 4.11/rtems-sparc 
+
+    # Add the cross compiler to the PATH and checkout RTEMS
+    export PATH=${RTPREFIX}/bin:$PATH
+    cd ..
+    [ ! -d rtems-git ] && {
+        git clone https://github.com/RTEMS/rtems.git rtems-git
+    }
+    cd rtems-git
+
+    # Checkout the revision Sebastian asked for
+    # git checkout -f 9d1f39434585e8d3f8897d95a2bfe1ddccb79aec
+    # git checkout -f 03b900d3ed120ea919ea3eded7edbece3488cff3
+    git checkout -f 4.11
+    ./bootstrap
+    cd ..
+    rm -rf build.${DATE}
+    mkdir build.${DATE}
+    cd build.${DATE}
+    ../rtems-git/configure \
+        --target=sparc-rtems4.11 --prefix=${RTPREFIX} \
+        --enable-rtemsbsp="leon2 leon3" --enable-posix \
+        --enable-cxx --enable-networking
+    make all
+    make install
+} |& tee ${BUILD_LOG}