git clone git://github.com/libretro/RetroArch.git
cd RetroArch
./configure --enable-ffmpeg
make
sudo make install


git clone git://github.com/libretro/libretro-super.git
cd libretro-super
sh libretro-fetch.sh
sh libretro-build.sh
sh libretro-install.sh <path>

apktool decode blabla.apk
on modifie puis:
apktool build org.retroidnetplay.652cfa957a2bc54f882ecb048ed8ea1f retroidnetplayv1.apk
puis : 
jdk1.8.0_05/bin/jarsigner -keystore clag.keystore -verbose retroidnetplay/retroidnetplayv1.apk clag

./adb install ../../Retroarch/RetroArch-armv7-v1.0.0.2-r34.apk
./adb push ../../../emu/retroarch/retroarch-pce/fmt.pce /sdcard/download/

you should sign to apk before install.

1)keytool -genkey -keystore (name).keystore -validity 10000 -alias (name)

2)answer some question (ex:name, company...

3)after make keystore file,you combine apk and ketstore

if these file are located same directory

jarsigner -keystore （name）.keystore -verbose LunarLander.apk （name）

apk size increase 2kb+;

after this install apk to avd

On récupere le script: 
http://blog.petrockblock.com/forums/topic/emulationstation-scraper-not-scraping/
https://github.com/sselph/scraper/releases
https://github.com/sselph/scraper

./scraper -thumb_only=true -image_path="~/.emulationstation/downloaded_images/pcengine"
puis:
./scraper -thumb_only=true -use_ovgdb=true -image_path="~/.emulationstation/downloaded_images/pcengine" 1>out.1 2>out.2
puis on recupere les erreurs:
cat out.2 |grep error |cut -d ":" -f 4 |sort |uniq > out.err