diff --git a/Build.sh b/Build.sh
new file mode 100644
index 0000000..324dd24
--- /dev/null
+++ b/Build.sh
@@ -0,0 +1,54 @@
+#!/bin/sh
+# $MirOS: src/bin/mksh/Build.sh,v 1.1 2005/05/23 16:48:52 tg Exp $
+
+# Recognised command line parameters and their defaults:
+#	CC		gcc
+#	CFLAGS		-O2 -fno-strict-aliasing -fno-strength-reduce
+#	CPPFLAGS	(empty)
+#	LDFLAGS		-static
+#	LIBS		(empty)
+#	srcdir		(path of script)
+#	NROFF		nroff
+
+SHELL="${SHELL:-/bin/sh}"
+CC="${CC:-gcc}"
+CFLAGS="${CFLAGS:--O2 -fno-strict-aliasing -fno-strength-reduce}"
+LDFLAGS="${LDFLAGS:--static}"
+srcdir="${srcdir:-`dirname $0`}"
+curdir="`pwd`"
+NROFF="${NROFF:-nroff}"
+OS="`uname -s || uname`"
+export SHELL CC
+
+SRCS="alloc.c edit.c eval.c exec.c expr.c funcs.c histrap.c"
+SRCS="$SRCS jobs.c lex.c main.c misc.c shf.c syn.c tree.c var.c"
+
+[ x"$OS" = x"Linux" ] && SRCS="$SRCS strlfun.c"
+
+echo Generating prerequisites...
+$SHELL $srcdir/gensigs.sh
+for hdr in errno signal; do
+	h2ph -d . /usr/include/$hdr.h && mv _h2ph_pre.ph $hdr.ph
+done
+echo Building...
+#( cd $srcdir; $CC $CFLAGS $CPPFLAGS $LDFLAGS -o $curdir/mksh $SRCS $LIBS )
+test -e mksh || exit 1
+echo Finalising...
+$NROFF -mdoc <$srcdir/mksh.1 >mksh.cat1 || rm -f mksh.cat1
+size mksh
+echo done.
+echo
+echo Testing mirbsdksh:
+echo "$ perl $srcdir/check.pl -s $srcdir/check.t -p $curdir/mksh -C pdksh"
+echo
+echo Installing mirbsdksh:
+echo "# install -c -s -o root -g bin -m 555 mksh /bin/mksh"
+echo "# echo /bin/mksh >>/etc/shells"
+echo
+echo Installing the manual:
+if test -s mksh.cat1; then
+	echo "# install -c -o root -g bin -m 444 mksh.cat1" \
+	    "/usr/share/man/cat1/mksh.0"
+	echo or
+fi
+echo "# install -c -o root -g bin -m 444 mksh.1 /usr/man/man1/mksh.1"