When building a project on my slave machine,this is the output that I receive:

$ /home/test/jenkins/tools/android-sdk/tools/emulator -no-boot-anim -ports 48274,35544 -prop persist.sys.language=en -prop persist.sys.country=US -avd hudson_en-US_240_WVGA_android-10_armeabi -no-snapshot-load -no-snapshot-save -wipe-data
SDL init failure, reason is: No available video device

• daemon not running. starting it now on port 46422 *
• daemon started successfully *
  [android] Emulator did not appear to start; giving up
  $ /home/test/jenkins/tools/android-sdk/platform-tools/adb disconnect localhost:35544
  [android] Stopping Android emulator
  $ /home/test/jenkins/tools/android-sdk/platform-tools/adb kill-server

but if I run the line,

emulator -no-boot-anim -ports 48274,35544 -prop persist.sys.language=en -prop persist.sys.cortuntry=US -avd hudson_en-US_240_WVGA_android-10_armeabi -no-snapshot-load -no-snapshot-save -wipe-data

on a terminal the emulator starts with no problem.