diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f531ce5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+**/pcmi/**
diff --git a/posix/preload b/posix/preload
new file mode 100755
index 0000000..e08451c
--- /dev/null
+++ b/posix/preload
@@ -0,0 +1,19 @@
+#!/bin/sh -e
+
+# SUM
+
+# TODO: extract self without resolving to $0 because it doesn't resolve links
+tail -c +"$(expr BYTES + 1)" $0 | lz4 -dc | tar -x
+# TODO: remove hardcoded directory
+# TODO: use a different extraction path
+cd ID
+
+export ORIGIN="$(pwd)"
+export LD_LIBRARY_PATH="$ORIGIN/lib"
+export PATH="$ORIGIN/bin":$PATH
+
+export LD_DEBUG='libs'
+
+# TODO: use $0 instead
+# FIXME: uses the system's basename
+exec bin/"$(basename "$1")"
diff --git a/posix/prepare b/posix/prepare
new file mode 100755
index 0000000..d142f59
--- /dev/null
+++ b/posix/prepare
@@ -0,0 +1,128 @@
+#!/bin/sh -ex
+
+# NEEDED: lz4 readelf tar cat awk cut sed sh sort
+
+WORKDIR="$(basename "$1")"
+SYS_LIBDIR='/lib'
+PRELOAD_SCRIPT='preload'
+LIBLIST=$WORKDIR/liblist
+SUMFILE=$WORKDIR/checksum
+tmpfile=$WORKDIR/tt
+
+die ()
+{
+	echo "$1"
+	exit
+}
+
+getlibs ()
+{
+	tmplist=$WORKDIR/tmplist
+
+	touch $LIBLIST
+	
+	readelf -d "$1" |
+	grep NEEDED |
+	awk '{print $5}' |
+	sed s/\\[/\ / | sed s/\\]/\ / > $tmplist
+
+	while test -s $tmplist; do
+		cat $LIBLIST $tmplist > $tmpfile
+		mv -f $tmpfile $LIBLIST
+		for f in $tmplist; do
+			readelf -d "$f" |
+			grep NEEDED |
+			awk '{print $5}' |
+			sed s/\\[/\ / | sed s/\\]/\ / > $tmplist
+		done
+	done
+	rm -f $tmplist
+}
+
+if ! [ $WORKDIR ]; then
+	die 'Not enough arguments'
+fi
+
+if ! test -d $WORKDIR ; then
+	die 'Argument is not a directory'
+fi
+
+if test -e $WORKDIR/bin; then 
+	if ! test -d $WORKDIR/bin; then
+		die 'bin/ is not a directory'
+	fi
+else
+	die 'Directory does not contain bin/'
+fi
+
+if ! test -e $WORKDIR/id; then
+	die 'id file not present'
+fi
+
+if ls -1 $WORKDIR/bin; then
+	for f in $WORKDIR/bin/*; do
+		if ! test -x $f; then
+			die "$f is not executable"
+		fi
+	done
+else
+	die 'bin/ is empty, there has to be at least one executable'
+fi
+
+# Create necessary directories and files
+mkdir -p $WORKDIR/lib
+mkdir -p $WORKDIR/man
+mkdir -p $WORKDIR/ext
+touch $WORKDIR/env
+
+# TODO: add usage and error checking
+# FIXME: double sed should be avoided
+DIRNAME="$WORKDIR"/"$(head -1 $WORKDIR/id | awk '{print $1}')"
+
+if test -s $LIBLIST; then
+	rm -f $LIBLIST
+fi
+
+for b in $WORKDIR/bin/*; do
+	getlibs $b
+done
+sort -u $LIBLIST > $tmpfile
+mv -f $tmpfile $LIBLIST
+while read f; do
+	find -L $SYS_LIBDIR -maxdepth 2 -name "$f" -exec cp -n {} $WORKDIR/lib/ \;
+done < $LIBLIST
+
+if test -d $DIRNAME; then
+	rm -rf $DIRNAME
+fi
+mkdir -p $DIRNAME
+
+cp -r $WORKDIR/bin $DIRNAME/
+cp -r $WORKDIR/lib $DIRNAME/
+cp -r $WORKDIR/man $DIRNAME/
+cp -r $WORKDIR/ext $DIRNAME/
+cp $WORKDIR/env $DIRNAME/
+cp $WORKDIR/id $DIRNAME/
+
+tar -c -f $DIRNAME.tar -C $WORKDIR "$(basename $DIRNAME)"
+md5sum -b $DIRNAME.tar | cut -d " " -f1 > $SUMFILE
+lz4 --rm $DIRNAME.tar
+
+cat "$PRELOAD_SCRIPT" |
+sed s/SUM/"$(cat $SUMFILE)"/ |
+sed s/ID/"$(basename "$DIRNAME")"/ > tpp
+
+size="$(wc -c tpp | cut -d " " -f1)"
+strsize="$(echo "BYTES" | wc -c)"
+numsize="$(echo "$size" | wc -c)"
+normsize="$(expr "$size" - "$(expr "$strsize" - "$numsize")")"
+
+cat tpp |
+sed s/BYTES/"$normsize"/ > tpr
+cat tpr "$DIRNAME".tar.lz4 > "$DIRNAME".it
+
+rm -f tpr tpp
+chmod +x "$DIRNAME".it
+
+rm -rf "$DIRNAME" 
+#"$DIRNAME".tar*