The real issue is:
debian/rules override_dh_auto_build-indep
make[1]: Entering directory
'/home/packages/tmp/at/d/android-platform-build-8.1.0+r23'
jh_build --javacopts="-source 7" --no-javadoc --main=com.android.signapk.SignApk
signapk.jar tools/signapk/
warning: [options] bootstrap class path not set in conjunction with -source 7
1 warning
javadoc: error - No public or protected classes found to document.
1 error
jh_build: find tools/signapk/ -name '*.java' -and -type f -print0 | xargs -s
512000 -0 /usr/lib/jvm/default-java/bin/javadoc -locale en_US -classpath
/usr/share/java/bcprov.jar:/usr/share/java/bcpkix.jar:/usr/share/java/apksig.jar:debian/_jh_build.signapk
-d debian/_jh_build.javadoc/api -quiet -source 7 -encoding ISO8859-1
-notimestamp returned exit code 123
make[1]: *** [debian/rules:26: signapk.jar] Error 2
make[1]: Leaving directory
'/home/packages/tmp/at/d/android-platform-build-8.1.0+r23'
make: *** [debian/rules:33: build] Error 2
