diff --git a/builder b/builder
index efa22ed..4897527 100755
--- a/builder
+++ b/builder
@@ -8,7 +8,7 @@ prog='$(basename "$0")'
 source environment
 
 version=$1
-package=python3
+package=python$version
 package_name=$package
 
 echo "$(date) setting global vars..."
@@ -17,7 +17,7 @@ dpkg_arch=$(dpkg --print-architecture)
 deb_package=${package}_${version}_${dpkg_arch}
 src_dir=$PWD/src
 build_dir=$PWD/build
-prefix=usr
+prefix=usr/local
 my_dir=$PWD
 
 echo "$(date) installing dependencies..."
diff --git a/environment b/environment
index 4b8ea9b..b0da374 100644
--- a/environment
+++ b/environment
@@ -6,4 +6,4 @@ dl_suffix=tgz
 dpkg_depends="zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev wget"
 configure_extra_params="--enable-optimizations"
 make_test=0
-install_param="install"
+install_param="altinstall"