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diff --git a/run-sbcl.sh b/run-sbcl.sh
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+# A simple shell-script to run the freshly build SBCL without
+# installing it. Expects to be run from the top of the SBCL source
+# tree.
+
+# This software is part of the SBCL system. See the README file for
+# more information.
+#
+# This software is derived from the CMU CL system, which was
+# written at Carnegie Mellon University and released into the
+# public domain. The software is in the public domain and is
+# provided with absolutely no warranty. See the COPYING and CREDITS
+# files for more information.
+
+set -e
+
+if [ "$1" = "--help" ]; then
+    echo "usage: run-sbcl.sh sbcl-options*"
+    echo
+    echo "Runs SBCL from the build directory or binary tarball without need for"
+    echo "installation. Except for --help and --core, accepts all the same"
+    echo "command-line options as SBCL does."
+    echo
+    echo "Expects the current directory to be the topmost directory of the SBCL"
+    echo "source tree or binary tarball."
+    echo
+    exit 1
+fi
+
+if [ -f sbcl-pwd.sh -a -x src/runtime/sbcl -a -f output/sbcl.core ]; then
+    . sbcl-pwd.sh
+    sbcl_pwd
+    echo "(running SBCL from: $SBCL_PWD)"
+    SBCL_HOME=$SBCL_PWD/contrib src/runtime/sbcl --core output/sbcl.core $@
+elif [ -f run-sbcl.sh -a -f version.lisp-expr ]; then
+    echo "No built SBCL here ($(pwd)): run 'sh make.sh' first!"
+    exit 1
+else
+    echo "No SBCL here ($(pwd))!"
+    echo
+    echo "run-sbcl.sh needs to be run from the top of the SBCL source tree or"
+    echo "binary tarball."
+    exit 1
+fi