upgrade worked well!
root@fablab:~# vi /etc/opkg/base-feeds.conf
root@fablab:~# opkg update
Downloading http://repo.opkg.net/edison/repo/all/Packages.gz.
Inflating http://repo.opkg.net/edison/repo/all/Packages.gz.
Updated list of available packages in /var/lib/opkg/all.
Downloading http://repo.opkg.net/edison/repo/edison/Packages.gz.
Inflating http://repo.opkg.net/edison/repo/edison/Packages.gz.
Updated list of available packages in /var/lib/opkg/edison.
Downloading http://repo.opkg.net/edison/repo/core2-32/Packages.gz.
Inflating http://repo.opkg.net/edison/repo/core2-32/Packages.gz.
Updated list of available packages in /var/lib/opkg/core2-32.
root@fablab:~# opkg install bluez5-dev
Installing bluez5-dev (5.18-r0) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/bluez5-dev_5.18-r0_core2-32.ipk.
python-pygobject-dev: unsatisfied recommendation for libpython2-dev
python-pygobject-dev: unsatisfied recommendation for python-textutils-dev
python-pygobject-dev: unsatisfied recommendation for python-pygobject-lib-dev
python-pygobject-dev: unsatisfied recommendation for python-core-dev
bluez5-dev: unsatisfied recommendation for libusb-dev
bluez5-dev: unsatisfied recommendation for udev-dev
bluez5-dev: unsatisfied recommendation for dbus-lib-dev
libdbus-glib-1-dev: unsatisfied recommendation for dbus-lib-dev
shadow-dev: unsatisfied recommendation for update-alternatives-opkg-dev
dbus-dev: unsatisfied recommendation for shadow-sysroot-dev
dbus-dev: unsatisfied recommendation for dbus-lib-dev
libdbus-glib-1-dev: unsatisfied recommendation for dbus-x11-dev
python-dbus-dev: unsatisfied recommendation for python-io-dev
python-dbus-dev: unsatisfied recommendation for dbus-lib-dev
python-dbus-dev: unsatisfied recommendation for python-logging-dev
python-dbus-dev: unsatisfied recommendation for python-xml-dev
python-dbus-dev: unsatisfied recommendation for python-stringold-dev
python-dbus-dev: unsatisfied recommendation for python-threading-dev
gawk-dev: unsatisfied recommendation for update-alternatives-opkg-dev
gawk-dev: unsatisfied recommendation for gawk-common-dev
bluez5-dev: unsatisfied recommendation for libudev-dev
Installing python-pygobject-dev (2.27.91-r6) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/python-pygobject-dev_2.27.91-r6_core2-32.ipk.
Installing libglib-2.0-dev (1:2.38.2-r0) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/libglib-2.0-dev_2.38.2-r0_core2-32.ipk.
Installing libffi-dev (3.0.13-r0) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/libffi-dev_3.0.13-r0_core2-32.ipk.
Installing libdbus-glib-1-dev (0.100.2-r0) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/libdbus-glib-1-dev_0.100.2-r0_core2-32.ipk.
Installing libexpat-dev (2.1.0-r0) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/libexpat-dev_2.1.0-r0_core2-32.ipk.
Installing dbus-dev (1.6.18-r0) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/dbus-dev_1.6.18-r0_core2-32.ipk.
Installing base-passwd-dev (3.5.29-r0) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/base-passwd-dev_3.5.29-r0_core2-32.ipk.
Installing shadow-dev (4.1.4.3-r14) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/shadow-dev_4.1.4.3-r14_core2-32.ipk.
Installing shadow-securetty-dev (4.1.4.3-r3) to root...
Downloading http://repo.opkg.net/edison/repo/edison/shadow-securetty-dev_4.1.4.3-r3_edison.ipk.
Installing base-files-dev (3.0.14-r86) to root...
Downloading http://repo.opkg.net/edison/repo/edison/base-files-dev_3.0.14-r86_edison.ipk.
Installing python-dbus-dev (1.2.0-r0) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/python-dbus-dev_1.2.0-r0_core2-32.ipk.
Installing libcheck-dev (0.9.12-r0) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/libcheck-dev_0.9.12-r0_core2-32.ipk.
Installing libcheck (0.9.12-r0) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/libcheck_0.9.12-r0_core2-32.ipk.
Installing gawk (4.0.2-r0) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/gawk_4.0.2-r0_core2-32.ipk.
Installing gawk-common (4.0.2-r0) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/gawk-common_4.0.2-r0_core2-32.ipk.
Installing gawk-dev (4.0.2-r0) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/gawk-dev_4.0.2-r0_core2-32.ipk.
Installing libical-dev (0.48-r0) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/libical-dev_0.48-r0_core2-32.ipk.
Installing libical (0.48-r0) to root...
Downloading http://repo.opkg.net/edison/repo/core2-32/libical_0.48-r0_core2-32.ipk.
Configuring libical.
Configuring libffi-dev.
Configuring libglib-2.0-dev.
Configuring python-pygobject-dev.
Configuring libexpat-dev.
Configuring base-passwd-dev.
Configuring shadow-securetty-dev.
Configuring shadow-dev.
Configuring base-files-dev.
Configuring dbus-dev.
Configuring libdbus-glib-1-dev.
Configuring python-dbus-dev.
Configuring gawk-common.
Configuring gawk.
update-alternatives: Linking //usr/bin/awk to /usr/bin/gawk
Configuring libcheck.
Configuring gawk-dev.
Configuring libcheck-dev.
Configuring libical-dev.
Configuring bluez5-dev.
root@fablab:~#