diff --git a/README.md b/README.md
index c40c568..441a7a9 100644
--- a/README.md
+++ b/README.md
@@ -9,8 +9,8 @@ Mesos is a cluster manager that provides efficient resource isolation and sharin
   * ruby
   * prerequisites:
 
-       gem install fpm
-       sudo apt-get install python-dev autoconf automake git make libssl-dev libcurl3
+       sudo apt-get install python-dev autoconf automake git-core make libssl-dev libcurl4-nss-dev libtool ruby-dev
+       sudo gem install fpm
 
 define in e.g. `~/.bash_profile` a `MAINTAINER` variable
 
diff --git a/build_mesos b/build_mesos
index efec218..13c7d77 100755
--- a/build_mesos
+++ b/build_mesos
@@ -129,7 +129,7 @@ function display_version {
 
 function create_installation {(
   local pwd="$(pwd -P)"
-  mkdir -p toor
+  sudo rm -rf toor && mkdir -p toor
   ( cd build && make install DESTDIR="$pwd"/toor )
   cd toor
   mkdir -p usr/share/doc/mesos etc/default etc/mesos var/log/mesos
@@ -138,7 +138,7 @@ function create_installation {(
   echo zk://localhost:2181/mesos > etc/mesos/zk
   init_scripts "$linux"
   jars
-  chown -R 0:0 .
+  sudo chown -R 0:0 .
 )}
 
 function init_scripts {
@@ -163,7 +163,7 @@ function init_scripts {
 
 function jars {
   mkdir -p usr/share/java/
-  mv ../build/src/mesos-*.jar usr/share/java/
+  mv ../build/src/java/target/mesos-*.jar usr/share/java/
 }
 
 function pkg {