diff --git a/configure.ac b/configure.ac
index 12a4bbfd..4a060021 100644
--- a/configure.ac
+++ b/configure.ac
@@ -120,7 +120,7 @@ AC_NO_EXECUTABLES
 
 dnl Minimum version of Automake is 1.8.
 dnl We don't want the gzip distribution tarball anymore.
-AM_INIT_AUTOMAKE([1.8 dist-bzip2 no-dist-gzip])
+AM_INIT_AUTOMAKE([1.8 dist-bzip2 no-dist-gzip foreign])
 
 # We don't want touse the cflags from the environment since we need control
 # of this when we're building the libs.
@@ -299,7 +299,7 @@ dnl
 dnl   $ pngtopnm foo.png > tmp.pnm
 dnl   $ pnmtopng -transparent white tmp.pnm > foo.png
 dnl
-dnl @version 
+dnl @version
 dnl @author Theodore A. Roth <troth@openavr.org> and Eric B. Weddington <eweddington@cso.atmel.com>
 dnl
 AC_DEFUN([CHECK_PNG_UTILS],[dnl
@@ -1363,6 +1363,8 @@ AC_CONFIG_FILES([
 	include/Makefile
 	include/avr/Makefile
 	include/avr/builtins.h
+	include/avr/io/Makefile
+	include/avr/legacyio/Makefile
 	include/compat/Makefile
 	include/util/Makefile
 	include/util/delay.h
@@ -1517,15 +1519,15 @@ AC_CONFIG_FILES([
 	avr/lib/avr5/at90scr100/Makefile
 	avr/lib/avr5/at90usb646/Makefile
 	avr/lib/avr5/at90usb647/Makefile
-	avr/lib/avr5/at94k/Makefile 
-	avr/lib/avr5/ata5702m322/Makefile 
-	avr/lib/avr5/ata5782/Makefile 
-	avr/lib/avr5/ata5790/Makefile 
-	avr/lib/avr5/ata5790n/Makefile 
-	avr/lib/avr5/ata5795/Makefile 
-	avr/lib/avr5/ata5831/Makefile 
-	avr/lib/avr5/ata6613c/Makefile 
-	avr/lib/avr5/ata6614q/Makefile 
+	avr/lib/avr5/at94k/Makefile
+	avr/lib/avr5/ata5702m322/Makefile
+	avr/lib/avr5/ata5782/Makefile
+	avr/lib/avr5/ata5790/Makefile
+	avr/lib/avr5/ata5790n/Makefile
+	avr/lib/avr5/ata5795/Makefile
+	avr/lib/avr5/ata5831/Makefile
+	avr/lib/avr5/ata6613c/Makefile
+	avr/lib/avr5/ata6614q/Makefile
 	avr/lib/avr5/atmega16/Makefile
 	avr/lib/avr5/atmega16a/Makefile
 	avr/lib/avr5/atmega161/Makefile
diff --git a/include/avr/Makefile.am b/include/avr/Makefile.am
index 81914c25..37feac34 100644
--- a/include/avr/Makefile.am
+++ b/include/avr/Makefile.am
@@ -29,6 +29,8 @@
 # $Id$
 #
 
+SUBDIRS = io legacyio
+
 avrdir = $(prefix)/avr/include/avr
 avr_HEADERS = \
 	boot.h \
diff --git a/include/avr/io/Makefile.am b/include/avr/io/Makefile.am
new file mode 100644
index 00000000..005c737b
--- /dev/null
+++ b/include/avr/io/Makefile.am
@@ -0,0 +1,307 @@
+# Copyright (c) 2020	 Roland Wirth
+# All rights reserved.
+#
+# 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.
+# * Neither the name of the copyright holders nor the names of
+#	contributors may be used to endorse or promote products derived
+#	from this software without specific prior written permission.
+#
+# 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 OWNER 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.
+#
+# $Id$
+#
+
+# regenerate with find . -name '*.h' | sed -e 's/^.\//\t/;s/$/ \\/'
+
+avrdir = $(prefix)/avr/include/avr/io
+avr_HEADERS = \
+	at90can128.h \
+	at90can32.h \
+	at90can64.h \
+	at90pwm1.h \
+	at90pwm161.h \
+	at90pwm216.h \
+	at90pwm2b.h \
+	at90pwm316.h \
+	at90pwm3b.h \
+	at90pwm81.h \
+	at90usb1286.h \
+	at90usb1287.h \
+	at90usb162.h \
+	at90usb646.h \
+	at90usb647.h \
+	at90usb82.h \
+	ata5272.h \
+	ata5505.h \
+	ata5700m322.h \
+	ata5702m322.h \
+	ata5781.h \
+	ata5782.h \
+	ata5783.h \
+	ata5787.h \
+	ata5790.h \
+	ata5790n.h \
+	ata5791.h \
+	ata5795.h \
+	ata5831.h \
+	ata5832.h \
+	ata5833.h \
+	ata5835.h \
+	ata6285.h \
+	ata6286.h \
+	ata6612c.h \
+	ata6613c.h \
+	ata6614q.h \
+	ata6616c.h \
+	ata6617c.h \
+	ata664251.h \
+	ata8210.h \
+	ata8215.h \
+	ata8510.h \
+	ata8515.h \
+	atmega128.h \
+	atmega1280.h \
+	atmega1281.h \
+	atmega1284.h \
+	atmega1284p.h \
+	atmega1284rfr2.h \
+	atmega128a.h \
+	atmega128rfa1.h \
+	atmega128rfr2.h \
+	atmega16.h \
+	atmega1608.h \
+	atmega1609.h \
+	atmega162.h \
+	atmega164a.h \
+	atmega164p.h \
+	atmega164pa.h \
+	atmega165a.h \
+	atmega165p.h \
+	atmega165pa.h \
+	atmega168.h \
+	atmega168a.h \
+	atmega168p.h \
+	atmega168pa.h \
+	atmega168pb.h \
+	atmega169a.h \
+	atmega169p.h \
+	atmega169pa.h \
+	atmega16a.h \
+	atmega16hva.h \
+	atmega16hvb.h \
+	atmega16hvbrevb.h \
+	atmega16m1.h \
+	atmega16u2.h \
+	atmega16u4.h \
+	atmega2560.h \
+	atmega2561.h \
+	atmega2564rfr2.h \
+	atmega256rfr2.h \
+	atmega32.h \
+	atmega3208.h \
+	atmega3209.h \
+	atmega324a.h \
+	atmega324p.h \
+	atmega324pa.h \
+	atmega324pb.h \
+	atmega325.h \
+	atmega3250.h \
+	atmega3250a.h \
+	atmega3250p.h \
+	atmega3250pa.h \
+	atmega325a.h \
+	atmega325p.h \
+	atmega325pa.h \
+	atmega328.h \
+	atmega328p.h \
+	atmega328pb.h \
+	atmega329.h \
+	atmega3290.h \
+	atmega3290a.h \
+	atmega3290p.h \
+	atmega3290pa.h \
+	atmega329a.h \
+	atmega329p.h \
+	atmega329pa.h \
+	atmega32a.h \
+	atmega32c1.h \
+	atmega32hvb.h \
+	atmega32hvbrevb.h \
+	atmega32m1.h \
+	atmega32u2.h \
+	atmega32u4.h \
+	atmega406.h \
+	atmega48.h \
+	atmega4808.h \
+	atmega4809.h \
+	atmega48a.h \
+	atmega48p.h \
+	atmega48pa.h \
+	atmega48pb.h \
+	atmega64.h \
+	atmega640.h \
+	atmega644.h \
+	atmega644a.h \
+	atmega644p.h \
+	atmega644pa.h \
+	atmega644rfr2.h \
+	atmega645.h \
+	atmega6450.h \
+	atmega6450a.h \
+	atmega6450p.h \
+	atmega645a.h \
+	atmega645p.h \
+	atmega649.h \
+	atmega6490.h \
+	atmega6490a.h \
+	atmega6490p.h \
+	atmega649a.h \
+	atmega649p.h \
+	atmega64a.h \
+	atmega64c1.h \
+	atmega64hve2.h \
+	atmega64m1.h \
+	atmega64rfr2.h \
+	atmega8.h \
+	atmega808.h \
+	atmega809.h \
+	atmega8515.h \
+	atmega8535.h \
+	atmega88.h \
+	atmega88a.h \
+	atmega88p.h \
+	atmega88pa.h \
+	atmega88pb.h \
+	atmega8a.h \
+	atmega8hva.h \
+	atmega8u2.h \
+	attiny10.h \
+	attiny102.h \
+	attiny104.h \
+	attiny11.h \
+	attiny12.h \
+	attiny13.h \
+	attiny13a.h \
+	attiny15.h \
+	attiny1604.h \
+	attiny1606.h \
+	attiny1607.h \
+	attiny1614.h \
+	attiny1616.h \
+	attiny1617.h \
+	attiny1634.h \
+	attiny167.h \
+	attiny20.h \
+	attiny202.h \
+	attiny204.h \
+	attiny212.h \
+	attiny214.h \
+	attiny2313.h \
+	attiny2313a.h \
+	attiny24.h \
+	attiny24a.h \
+	attiny25.h \
+	attiny26.h \
+	attiny261.h \
+	attiny261a.h \
+	attiny3216.h \
+	attiny3217.h \
+	attiny4.h \
+	attiny40.h \
+	attiny402.h \
+	attiny404.h \
+	attiny406.h \
+	attiny412.h \
+	attiny414.h \
+	attiny416.h \
+	attiny416auto.h \
+	attiny417.h \
+	attiny4313.h \
+	attiny43u.h \
+	attiny44.h \
+	attiny441.h \
+	attiny44a.h \
+	attiny45.h \
+	attiny461.h \
+	attiny461a.h \
+	attiny48.h \
+	attiny5.h \
+	attiny804.h \
+	attiny806.h \
+	attiny807.h \
+	attiny814.h \
+	attiny816.h \
+	attiny817.h \
+	attiny828.h \
+	attiny84.h \
+	attiny841.h \
+	attiny84a.h \
+	attiny85.h \
+	attiny861.h \
+	attiny861a.h \
+	attiny87.h \
+	attiny88.h \
+	attiny9.h \
+	atxmega128a1.h \
+	atxmega128a1u.h \
+	atxmega128a3.h \
+	atxmega128a3u.h \
+	atxmega128a4u.h \
+	atxmega128b1.h \
+	atxmega128b3.h \
+	atxmega128c3.h \
+	atxmega128d3.h \
+	atxmega128d4.h \
+	atxmega16a4.h \
+	atxmega16a4u.h \
+	atxmega16c4.h \
+	atxmega16d4.h \
+	atxmega16e5.h \
+	atxmega192a3.h \
+	atxmega192a3u.h \
+	atxmega192c3.h \
+	atxmega192d3.h \
+	atxmega256a3.h \
+	atxmega256a3b.h \
+	atxmega256a3bu.h \
+	atxmega256a3u.h \
+	atxmega256c3.h \
+	atxmega256d3.h \
+	atxmega32a4.h \
+	atxmega32a4u.h \
+	atxmega32c3.h \
+	atxmega32c4.h \
+	atxmega32d3.h \
+	atxmega32d4.h \
+	atxmega32e5.h \
+	atxmega384c3.h \
+	atxmega384d3.h \
+	atxmega64a1.h \
+	atxmega64a1u.h \
+	atxmega64a3.h \
+	atxmega64a3u.h \
+	atxmega64a4u.h \
+	atxmega64b1.h \
+	atxmega64b3.h \
+	atxmega64c3.h \
+	atxmega64d3.h \
+	atxmega64d4.h \
+	atxmega8e5.h
diff --git a/include/avr/legacyio/Makefile.am b/include/avr/legacyio/Makefile.am
index 2a3f6fc0..16b0bdba 100644
--- a/include/avr/legacyio/Makefile.am
+++ b/include/avr/legacyio/Makefile.am
@@ -29,281 +29,274 @@
 # $Id$
 #
 
+# regenerate with find . -name '*.h' | sed -e 's/^.\//\t/;s/$/ \\/'
+
+avrdir = $(prefix)/avr/include/avr/legacyio
 avr_HEADERS = \
-    boot.h \
-    common.h \
-    cpufunc.h \
-    crc16.h \
-    delay.h \
-    eeprom.h \
-    fuse.h \
-    interrupt.h \
-    io.h \
-    legacyio.h\
-    io1200.h \
-    io2313.h \
-    io2323.h \
-    io2333.h \
-    io2343.h \
-    io43u32x.h \
-    io43u35x.h \
-    io4414.h \
-    io4433.h \
-    io4434.h \
-    io76c711.h \
-    io8515.h \
-    io8534.h \
-    io8535.h \
-    io86r401.h \
-    io90pwm1.h \
-    io90pwmx.h \
-    io90pwm2b.h \
-    io90pwm216.h \
-    io90pwm3b.h \
-    io90pwm316.h \
-    io90pwm161.h \
-    io90pwm81.h \
-    io90scr100.h \
-    ioa5505.h \
-    ioa5272.h \
-    ioa5702m322.h \
-    ioa5782.h \
-    ioa5790.h \
-    ioa5790n.h \
-    ioa5795.h \
-    ioa5831.h \
-    ioa6285.h \
-    ioa6286.h \
-    ioa6289.h \
-    ioa6612c.h \
-    ioa6613c.h \
-    ioa6614q.h \
-    ioa6616c.h \
-    ioa6617c.h \
-    ioa664251.h \
-    ioat94k.h \
-    iocan32.h \
-    iocan64.h \
-    iocan128.h \
-    iocanxx.h \
-    iom103.h \
-    iom128.h \
-    iom128a.h \
-    iom1280.h \
-    iom1281.h \
-    iom1284.h \
-    iom1284p.h \
-    iom128rfa1.h \
-    iom1284rfr2.h \
-    iom128rfr2.h \
-    iom16.h \
-    iom16a.h \
-    iom161.h \
-    iom162.h \
-    iom163.h \
-    iom164.h \
-    iom164pa.h \
-    iom165.h \
-    iom165a.h \
-    iom165p.h \
-    iom165pa.h \
-    iom168.h \
-    iom168a.h \
-    iom168p.h \
-    iom168pa.h \
-    iom169.h \
-    iom169p.h \
-    iom169pa.h \
-    iom16hva.h \
-    iom16hva2.h \
-    iom16hvb.h \
-    iom16hvbrevb.h \
-    iom16m1.h \
-    iom16u2.h \
-    iom16u4.h \
-    iom2560.h \
-    iom2561.h \
-    iom256rfr2.h \
-    iom2564rfr2.h \
-    iom3000.h \
-    iom32.h \
-    iom32a.h \
-    iom323.h \
-    iom324.h \
-    iom324pa.h \
-    iom325.h \
-    iom325pa.h \
-    iom3250.h \
-    iom3250pa.h \
-    iom328p.h \
-    iom329.h \
-    iom3290.h \
-    iom3290pa.h \
-    iom32hvb.h \
-    iom32hvbrevb.h \
-    iom32c1.h \
-    iom32m1.h \
-    iom32u2.h \
-    iom32u4.h \
-    iom32u6.h \
-    iom48.h \
-    iom48a.h \
-    iom48pa.h \
-    iom48pb.h \
-    iom48p.h \
-    iom406.h \
-    iom64.h \
-    iom64a.h \
-    iom640.h \
-    iom644.h \
-    iom644a.h \
-    iom644p.h \
-    iom644pa.h \
-    iom645.h \
-    iom6450.h \
-    iom649.h \
-    iom649p.h \
-    iom6490.h \
-    iom64c1.h \
-    iom64hve.h \
-    iom64hve2.h \
-    iom64m1.h \
-    iom64rfr2.h \
-    iom644rfr2.h \
-    iom8.h \
-    iom8a.h \
-    iom8515.h \
-    iom8535.h \
-    iom88.h \
-    iom88a.h \
-    iom88p.h \
-    iom88pa.h \
-    iom88pb.h \
-    iom8hva.h \
-    iom8u2.h \
-    iomx8.h \
-    iomxx0_1.h \
-    iomxx4.h \
-    iomxxhva.h \
-    iotn4.h \
-    iotn5.h \
-    iotn9.h \
-    iotn10.h \
-    iotn11.h \
-    iotn12.h \
-    iotn13.h \
-    iotn13a.h \
-    iotn15.h \
-    iotn167.h \
-    iotn1634.h \
-    iotn20.h \
-    iotn22.h \
-    iotn828.h \
-    iotn2313.h \
-    iotn2313a.h \
-    iotn24.h \
-    iotn24a.h \
-    iotn25.h \
-    iotn26.h \
-    iotn261.h \
-    iotn261a.h \
-    iotn28.h \
-    iotn40.h \
-    iotn4313.h \
-    iotn43u.h \
-    iotn44.h \
-    iotn44a.h \
-    iotn441.h \
-    iotn45.h \
-    iotn461.h \
-    iotn461a.h \
-    iotn48.h \
-    iotn88.h \
-    iotn84.h \
-    iotn84a.h \
-    iotn841.h \
-    iotn85.h \
-    iotn861.h \
-    iotn861a.h \
-    iotn87.h \
-    iotnx4.h \
-    iotnx5.h \
-    iotnx61.h \
-    iotn202.h \
-    iotn204.h \
-    iotn212.h \
-    iotn214.h \
-    iotn402.h \
-    iotn404.h \
-    iotn406.h \
-    iotn412.h \
-    iotn414.h \
-    iotn416.h \
-    iotn417.h \
-    iotn804.h \
-    iotn806.h \
-    iotn807.h \
-    iotn814.h \
-    iotn816.h \
-    iotn817.h \
-    iotn1604.h \
-    iotn1606.h \
-    iotn1607.h \
-    iotn1614.h \
-    iotn1616.h \
-    iotn1617.h \
-    iotn3214.h \
-    iotn3216.h \
-    iotn3217.h \
-    iousb82.h \
-    iousb1286.h \
-    iousb1287.h \
-    iousb162.h \
-    iousbxx2.h \
-    iousb646.h \
-    iousb647.h \
-    iousbxx6_7.h \
-    iox64d3.h \
-    iox64d4.h \
-    iox128a1.h \
-    iox128a1u.h \
-    iox128a4u.h \
-    iox128a3.h \
-    iox128a3u.h \
-    iox128b1.h \
-    iox128b3.h \
-    iox128c3.h \
-    iox128d3.h \
-    iox128d4.h \
-    iox16a4.h \
-    iox16a4u.h \
-    iox16c4.h \
-    iox16d4.h \
-    iox192a3.h \
-    iox192a3u.h \
-    iox192c3.h \
-    iox192d3.h \
-    iox256a3.h \
-    iox256a3u.h \
-    iox256a3b.h \
-    iox256a3bu.h \
-    iox256c3.h \
-    iox256d3.h \
-    iox384c3.h \
-    iox384d3.h \
-    iox32a4.h \
-    iox32a4u.h \
-    iox32c3.h \
-    iox32c4.h \
-    iox32d3.h \
-    iox32d4.h \
-    iox32e5.h \
-    iox64a1.h \
-    iox64a1u.h \
-    iox64a3.h \
-    iox64a3u.h \
-    iox64a4u.h \
-    iox64b1.h \
-    iox64b3.h \
-    iox64c3.h \
-    iox8e5.h
+	io1200.h \
+	io2313.h \
+	io2323.h \
+	io2333.h \
+	io2343.h \
+	io43u32x.h \
+	io43u35x.h \
+	io4414.h \
+	io4433.h \
+	io4434.h \
+	io76c711.h \
+	io8515.h \
+	io8534.h \
+	io8535.h \
+	io86r401.h \
+	io90pwm1.h \
+	io90pwm161.h \
+	io90pwm216.h \
+	io90pwm2b.h \
+	io90pwm316.h \
+	io90pwm3b.h \
+	io90pwm81.h \
+	io90pwmx.h \
+	io90scr100.h \
+	ioa5272.h \
+	ioa5505.h \
+	ioa5702m322.h \
+	ioa5782.h \
+	ioa5790.h \
+	ioa5790n.h \
+	ioa5795.h \
+	ioa5831.h \
+	ioa6285.h \
+	ioa6286.h \
+	ioa6289.h \
+	ioa6612c.h \
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