diff --git a/data/Notes.pc.in b/data/Notes.pc.in
new file mode 100644
index 0000000..0eb72f0
--- /dev/null
+++ b/data/Notes.pc.in
@@ -0,0 +1,11 @@
+prefix=@PREFIX@
+includedir=${prefix}/include
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+
+Name: Notes
+Description: DeforaOS Desktop Notes library
+Version: @VERSION@
+Requires: libDesktop
+Cflags: -I${includedir}
+Libs: -L${libdir} @RPATH@ -lNotes
diff --git a/data/pkgconfig.sh b/data/pkgconfig.sh
new file mode 100755
index 0000000..bbb503e
--- /dev/null
+++ b/data/pkgconfig.sh
@@ -0,0 +1,198 @@
+#!/bin/sh
+#$Id$
+#Copyright (c) 2011-2022 Pierre Pronchery <khorben@defora.org>
+#
+#Redistribution and use in source and binary forms, with or without
+#modification, are permitted provided that the following conditions are met:
+#
+# * Redistributions of source code must retain the above copyright notice, this
+#   list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above copyright notice,
+#   this list of conditions and the following disclaimer in the documentation
+#   and/or other materials provided with the distribution.
+#
+#THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+#AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+#IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+#DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+#FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+#DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+#SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+#CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+#OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+#OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+
+#variables
+CONFIGSH="${0%/pkgconfig.sh}/../config.sh"
+PREFIX="/usr/local"
+DEVNULL="/dev/null"
+PROGNAME="pkgconfig.sh"
+#executables
+DEBUG="_debug"
+INSTALL="install"
+MKDIR="mkdir -m 0755 -p"
+RM="rm -f"
+SED="sed"
+
+[ -f "$CONFIGSH" ] && . "$CONFIGSH"
+
+
+#functions
+#pkgconfig
+_pkgconfig()
+{
+	#check the variables
+	if [ -z "$PACKAGE" ]; then
+		_error "The PACKAGE variable needs to be set"
+		return $?
+	fi
+	if [ -z "$VERSION" ]; then
+		_error "The VERSION variable needs to be set"
+		return $?
+	fi
+	[ -z "$BINDIR" ] && BINDIR="$PREFIX/bin"
+	[ -z "$DATADIR" ] && DATADIR="$PREFIX/share"
+	[ -z "$INCLUDEDIR" ] && INCLUDEDIR="$PREFIX/include"
+	[ -z "$LIBDIR" ] && LIBDIR="$PREFIX/lib"
+	[ -z "$LIBEXECDIR" ] && LIBEXECDIR="$PREFIX/libexec"
+	[ -z "$MANDIR" ] && MANDIR="$DATADIR/man"
+	[ -z "$SBINDIR" ] && SBINDIR="$PREFIX/sbin"
+	if [ -z "$SYSCONFDIR" ]; then
+		SYSCONFDIR="$PREFIX/etc"
+		[ "$PREFIX" = "/usr" ] && SYSCONFDIR="/etc"
+	fi
+	PKGCONFIG="$PREFIX/lib/pkgconfig"
+
+	while [ $# -gt 0 ]; do
+		target="$1"
+		shift
+
+		#clean
+		[ "$clean" -ne 0 ] && continue
+
+		#uninstall
+		if [ "$uninstall" -eq 1 ]; then
+			$DEBUG $RM -- "$PKGCONFIG/$target"	|| return 2
+			continue
+		fi
+
+		#install
+		if [ "$install" -eq 1 ]; then
+			source="${target#$OBJDIR}"
+			$DEBUG $MKDIR -- "$PKGCONFIG"		|| return 2
+			mode="-m 0644"
+			basename="$source"
+			if [ "${source##*/}" != "$source" ]; then
+				basename="${source##*/}"
+			fi
+			$DEBUG $INSTALL $mode "$target" "$PKGCONFIG/$basename" \
+								|| return 2
+			continue
+		fi
+
+		#portability
+		RPATH=
+		if [ "$PREFIX" != "/usr" ]; then
+			RPATH="-Wl,-rpath-link,\${libdir} -Wl,-rpath,\${libdir}"
+			case $(uname -s) in
+				"Darwin")
+					RPATH="-Wl,-rpath,\${libdir}"
+					;;
+				"SunOS")
+					RPATH="-Wl,-R\${libdir}"
+					;;
+			esac
+		fi
+
+		#create
+		source="${target#$OBJDIR}"
+		source="${source}.in"
+		([ -z "$OBJDIR" ] || $DEBUG $MKDIR -- "${target%/*}") \
+								|| return 2
+		$DEBUG $SED -e "s;@VENDOR@;$VENDOR;g" \
+			-e "s;@PACKAGE@;$PACKAGE;g" \
+			-e "s;@VERSION@;$VERSION;g" \
+			-e "s;@PREFIX@;$PREFIX;g" \
+			-e "s;@BINDIR@;$BINDIR;g" \
+			-e "s;@DATADIR@;$DATADIR;g" \
+			-e "s;@INCLUDEDIR@;$INCLUDEDIR;g" \
+			-e "s;@LIBDIR@;$LIBDIR;g" \
+			-e "s;@LIBEXECDIR@;$LIBEXECDIR;g" \
+			-e "s;@MANDIR@;$MANDIR;g" \
+			-e "s;@PWD@;$PWD;g" \
+			-e "s;@RPATH@;$RPATH;g" \
+			-e "s;@SBINDIR@;$SBINDIR;g" \
+			-e "s;@SYSCONFDIR@;$SYSCONFDIR;g" \
+			-- "$source" > "$target"
+		if [ $? -ne 0 ]; then
+			$RM -- "$target" 2> "$DEVNULL"
+			return 2
+		fi
+	done
+	return 0
+}
+
+
+#debug
+_debug()
+{
+	echo "$@" 1>&3
+	"$@"
+}
+
+
+#error
+_error()
+{
+	echo "$PROGNAME: $@" 1>&2
+	return 2
+}
+
+
+#usage
+_usage()
+{
+	echo "Usage: $PROGNAME [-c|-i|-u][-P prefix] target..." 1>&2
+	return 1
+}
+
+
+#main
+clean=0
+install=0
+uninstall=0
+while getopts "ciuO:P:" name; do
+	case $name in
+		c)
+			clean=1
+			;;
+		i)
+			uninstall=0
+			install=1
+			;;
+		u)
+			install=0
+			uninstall=1
+			;;
+		O)
+			export "${OPTARG%%=*}"="${OPTARG#*=}"
+			;;
+		P)
+			PREFIX="$OPTARG"
+			;;
+		?)
+			_usage
+			exit $?
+			;;
+	esac
+done
+shift $(($OPTIND - 1))
+if [ $# -lt 1 ]; then
+	_usage
+	exit $?
+fi
+
+exec 3>&1
+_pkgconfig "$@"
diff --git a/data/project.conf b/data/project.conf
index 4d95de6..2404255 100644
--- a/data/project.conf
+++ b/data/project.conf
@@ -1,4 +1,13 @@
-dist=Makefile,deforaos-notes.desktop
+targets=Notes.pc
+dist=Makefile,Notes.pc.in,deforaos-notes.desktop,pkgconfig.sh
 
+#targets
+[Notes.pc]
+type=script
+script=./pkgconfig.sh
+depends=Notes.pc.in,../config.sh
+install=
+
+#dist
 [deforaos-notes.desktop]
 install=$(PREFIX)/share/applications
diff --git a/include/Notes.h b/include/Notes.h
new file mode 100644
index 0000000..8a0450a
--- /dev/null
+++ b/include/Notes.h
@@ -0,0 +1,66 @@
+/* $Id$ */
+/* Copyright (c) 2015-2024 Pierre Pronchery <khorben@defora.org> */
+/* This file is part of DeforaOS Desktop Notes */
+/* All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
+
+
+
+#ifndef DESKTOP_NOTES_H
+# define DESKTOP_NOTES_H
+
+# include <gtk/gtk.h>
+
+
+/* Notes */
+/* types */
+typedef struct _Notes Notes;
+
+typedef enum _NotesColumn
+{
+	ND_COL_NOTE = 0,
+	ND_COL_TITLE,
+	ND_COL_CATEGORY
+} NotesColumn;
+# define ND_COL_LAST ND_COL_CATEGORY
+# define ND_COL_COUNT (ND_COL_LAST + 1)
+
+
+/* functions */
+Notes * notes_new(GtkWidget * window, GtkAccelGroup * group);
+void notes_delete(Notes * notes);
+
+/* accessors */
+GtkWidget * notes_get_view(Notes * notes);
+GtkTreeViewColumn * notes_get_view_column(Notes * notes, unsigned int i);
+GtkWidget * notes_get_widget(Notes * notes);
+
+/* useful */
+void notes_about(Notes * notes);
+int notes_error(Notes * notes, char const * message, int ret);
+
+void notes_show_preferences(Notes * notes, gboolean show);
+
+#endif /* !DESKTOP_NOTES_H */
diff --git a/include/project.conf b/include/project.conf
new file mode 100644
index 0000000..0477773
--- /dev/null
+++ b/include/project.conf
@@ -0,0 +1,6 @@
+includes=Notes.h
+dist=Makefile
+
+#includes
+[Notes.h]
+install=$(INCLUDEDIR)/Desktop
diff --git a/project.conf b/project.conf
index 221dd91..99f7956 100644
--- a/project.conf
+++ b/project.conf
@@ -2,7 +2,7 @@ package=Notes
 version=0.2.0
 config=h,sh
 
-subdirs=data,doc,po,src,tools,tests
+subdirs=data,doc,include,po,src,tools,tests
 targets=tests
 dist=Makefile,COPYING,config.h,config.sh
 
diff --git a/src/notes.c b/src/notes.c
index a108a71..3b7ccee 100644
--- a/src/notes.c
+++ b/src/notes.c
@@ -57,13 +57,6 @@ static char const _license[] = "All rights reserved.\n"
 /* Notes */
 /* private */
 /* types */
-typedef enum _NotesColumn
-{
-	ND_COL_NOTE, ND_COL_TITLE, ND_COL_CATEGORY
-} NotesColumn;
-#define ND_COL_LAST ND_COL_CATEGORY
-#define ND_COL_COUNT (ND_COL_LAST + 1)
-
 struct _Notes
 {
 	GtkWidget * window;
@@ -260,6 +253,22 @@ void notes_delete(Notes * notes)
 
 
 /* accessors */
+/* notes_get_view */
+GtkWidget * notes_get_view(Notes * notes)
+{
+	return notes->view;
+}
+
+
+/* notes_get_view_column */
+GtkTreeViewColumn * notes_get_view_column(Notes * notes, unsigned int i)
+{
+	if(i >= 0 && i <= ND_COL_LAST)
+		return notes->columns[i];
+	return NULL;
+}
+
+
 /* notes_get_widget */
 GtkWidget * notes_get_widget(Notes * notes)
 {
diff --git a/src/notes.h b/src/notes.h
index 0588616..5348878 100644
--- a/src/notes.h
+++ b/src/notes.h
@@ -31,29 +31,13 @@
 #ifndef NOTES_NOTES_H
 # define NOTES_NOTES_H
 
+# include "../include/Notes.h"
 # include "note.h"
-# include <gtk/gtk.h>
 
 
 /* Notes */
-/* types */
-typedef struct _Notes Notes;
-
-
 /* functions */
-Notes * notes_new(GtkWidget * window, GtkAccelGroup * group);
-void notes_delete(Notes * notes);
-
-/* accessors */
-GtkWidget * notes_get_widget(Notes * notes);
-
-/* useful */
-void notes_about(Notes * notes);
-int notes_error(Notes * notes, char const * message, int ret);
-
-void notes_show_preferences(Notes * notes, gboolean show);
-
-/* notes */
+/* note */
 Note * notes_note_add(Notes * notes, Note * note);
 void notes_note_delete_selected(Notes * notes);
 void notes_note_remove_all(Notes * notes);
diff --git a/src/project.conf b/src/project.conf
index beb16d5..0a214b3 100644
--- a/src/project.conf
+++ b/src/project.conf
@@ -1,31 +1,36 @@
-targets=notes
+targets=libNotes,notes
+cppflags_force=-I../include
 #cppflags=-D EMBEDDED
 cflags_force=`pkg-config --cflags libDesktop`
-cflags=-W -Wall -g -O2 -fPIE -D_FORTIFY_SOURCE=2 -fstack-protector
+cflags=-W -Wall -g -O2 -D_FORTIFY_SOURCE=2 -fstack-protector
 ldflags_force=`pkg-config --libs libDesktop` -lintl
 ldflags=-pie -Wl,-z,relro -Wl,-z,now
 dist=Makefile,note.h,noteedit.h,notes.h,window.h
 
 #targets
+[libNotes]
+type=library
+sources=note.c,noteedit.c,notes.c,window.c
+cflags=-fPIC
+install=$(LIBDIR)
+
 [notes]
 type=binary
-sources=note.c,noteedit.c,notes.c,window.c,main.c
+sources=main.c
+depends=libNotes$(SOEXT)
+cflags=-fPIE
+ldflags=-L. -Wl,-rpath,$(LIBDIR) -lNotes
 install=$(BINDIR)
 
 #sources
 [main.c]
-depends=note.h,notes.h,../config.h
+depends=../include/Notes.h,note.h,notes.h,../config.h
 
 [note.c]
 depends=note.h
-cflags=-fPIC
-
-[noteedit.c]
-cflags=-fPIC
 
 [notes.c]
-depends=note.h,notes.h,../config.h
-cflags=-fPIC
+depends=../include/Notes.h,note.h,notes.h,../config.h
 
 [window.c]
-depends=notes.h,window.h
+depends=../include/Notes.h,notes.h,window.h
diff --git a/tools/notes.c b/tools/notes.c
index 3755032..b602a4e 100644
--- a/tools/notes.c
+++ b/tools/notes.c
@@ -28,15 +28,9 @@
 
 
 
-#ifndef EMBEDDED
-# define EMBEDDED
-#endif
 #include <stdlib.h>
 #include <Desktop/Mailer/plugin.h>
-
-#include "../src/note.c"
-#include "../src/noteedit.c"
-#include "../src/notes.c"
+#include "Notes.h"
 
 
 /* Notes */
@@ -87,6 +81,7 @@ static MailerPlugin * _notes_init(MailerPluginHelper * helper)
 {
 	NotesPlugin * notes;
 	GtkWidget * widget;
+	GtkTreeViewColumn * column;
 	size_t i;
 
 	if((notes = malloc(sizeof(*notes))) == NULL)
@@ -100,12 +95,13 @@ static MailerPlugin * _notes_init(MailerPluginHelper * helper)
 	notes->widget = gtk_box_new(GTK_ORIENTATION_VERTICAL, 4);
 	widget = notes_get_widget(notes->notes);
 	gtk_box_pack_start(GTK_BOX(notes->widget), widget, TRUE, TRUE, 0);
-	gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(notes->notes->view),
-			FALSE);
+	widget = notes_get_view(notes->notes);
+	gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(widget), FALSE);
 	for(i = 0; i < ND_COL_COUNT; i++)
-		if(notes->notes->columns[i] != NULL && i != ND_COL_TITLE)
-			gtk_tree_view_column_set_visible(notes->notes->columns[i],
-					FALSE);
+		if((column = notes_get_view_column(notes->notes, i)) == NULL)
+			continue;
+		else if(i != ND_COL_TITLE)
+			gtk_tree_view_column_set_visible(column, FALSE);
 	gtk_widget_show_all(notes->widget);
 	return notes;
 }
diff --git a/tools/project.conf b/tools/project.conf
index a4c8a83..ce05bef 100644
--- a/tools/project.conf
+++ b/tools/project.conf
@@ -1,4 +1,5 @@
 targets=notes
+cppflags=-I../include
 cflags_force=`pkg-config --cflags libDesktop Mailer` -fPIC
 cflags=-W -Wall -g -O2 -D_FORTIFY_SOURCE=2 -fstack-protector
 ldflags_force=`pkg-config --libs libDesktop`
@@ -9,6 +10,7 @@ dist=Makefile
 [notes]
 type=plugin
 sources=notes.c
+ldflags=-L../src -Wl,-rpath,$(LIBDIR) -lNotes
 install=$(LIBDIR)/Mailer/plugins
 
 #sources