diff --git a/metadata/eu.siacs.conversations.txt b/metadata/eu.siacs.conversations.txt
index 3132901944..6a9bffccbc 100644
--- a/metadata/eu.siacs.conversations.txt
+++ b/metadata/eu.siacs.conversations.txt
@@ -33,9 +33,11 @@ Build:0.1.3,9
     srclibs=Otr4j-jitsi@33d95bb3710986d048fb4cbe42dc991f9ddd9de2,BouncyCastle@r1rv50
     commit=0.1.3
     submodules=yes
-    rm=libs/android-support-v4.jar
-    extlibs=android/android-support-v4.jar
+    rm=libs/bcprov-jdk15on-150.jar
     scanignore=libs/otr4j-0.10.jar,libs/bcprov-jdk15on-150.jar
+    prebuild=pushd $$BouncyCastle$$ && \
+        ant -f ant/jdk15+.xml build-provider && \
+        popd && cp $$BouncyCastle$$/build/artifacts/jdk1.5/jars/bcprov-jdk15on-150.jar libs/
 
 Maintainer Notes:
 
@@ -44,11 +46,8 @@ match hashes from upstream.
 
 HASHES MUST BE RE-CHECKED ON CHANGE!
 
-However, we should built thoses jars from sourc asap, like:
-
-    rm=libs/android-support-v4.jar,libs/otr4j-0.10.jar,libs/bcprov-jdk15on-150.jar
-    prebuild=pushd $$BouncyCastle$$ && gradle jar && popd && cp $$BouncyCastle$$/prov/build/libs/* libs/ && \
-         cp -r $$Otr4j-jitsi$$/src/main src/
+== OTR4J ==
+cp -r $$Otr4j-jitsi$$/src/main src/
 
 Commits for otr4j:
 otr4j-0.10 33d95bb3710986d048fb4cbe42dc991f9ddd9de2