diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
new file mode 100644
index 0000000..7ac6005
--- /dev/null
+++ b/CONTRIBUTORS.md
@@ -0,0 +1,4 @@
+Thank you very much for your help and advices!
+
+- Ivaylo Dimitrov <freemangordon@abv.bg>
+- Merlijn Wajer <http://wizzup.org>
diff --git a/boards/nokia-n900.sh b/boards/nokia-n900.sh
index b904fd7..5e623e4 100644
--- a/boards/nokia-n900.sh
+++ b/boards/nokia-n900.sh
@@ -33,7 +33,7 @@ parted_type="dos"
 parted_boot="fat32 2048s 264191s"
 parted_root="ext4 264192s 100%"
 
-extra_packages=()
+extra_packages+=()
 custmodules=()
 
 gitkernel="git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git"
@@ -50,6 +50,7 @@ prebuild() {
 	enablessh
 	write-fstab
 	copy-zram-init
+	install-custom-packages
 
 	mkdir -p $R/tmp/kernels/$device_name
 
diff --git a/lib/helpers b/lib/helpers
index b560dd6..129f5f1 100644
--- a/lib/helpers
+++ b/lib/helpers
@@ -19,10 +19,30 @@
 
 ## helper functions for arm-sdk
 
-build-image() {
-	fn build-image "$@"
+install-custom-packages() {
+	fn install-custom-packages
+	req=(R os device_name strapdir)
+	ckreq || return 1
+
+	case $os in
+		devuan)
+			mkdir -p $R/extra/custom-packages
+			pushd $R/extra/custom-packages
+			local pkgs=$(find ../$device_name/*.deb)
+			[[ -n $pkgs ]] && {
+				for deb in $pkgs; do
+					ln -sf $deb .
+				done
+				install-custdebs
+			}
+			popd
+			rm -rf $R/extra/custom-packages
+			;;
+		*)
+			warn "skipping custom packages. os unsupported."
+			;;
+	esac
 
-	bootstrap $arch
 }
 
 get-kernel-sources() {
diff --git a/lib/libdevuansdk b/lib/libdevuansdk
index 331398f..d28e0a9 160000
--- a/lib/libdevuansdk
+++ b/lib/libdevuansdk
@@ -1 +1 @@
-Subproject commit 331398ff51da55ffa126d3ecab1b1cc6578ef7d4
+Subproject commit d28e0a93f4561099adc6c270027ed3331ce44489