diff --git a/qb/config.params.sh b/qb/config.params.sh
index 3bf0d3305e..34dc9a88d2 100644
--- a/qb/config.params.sh
+++ b/qb/config.params.sh
@@ -16,3 +16,4 @@ add_command_line_enable OSS "Enable OSS support" auto
 add_command_line_enable RSOUND "Enable RSound support" auto
 add_command_line_enable ROAR "Enable RoarAudio support" auto
 add_command_line_enable AL "Enable OpenAL support" auto
+add_command_line_enable JACK "Enable JACK support" auto
diff --git a/qb/qb.params.sh b/qb/qb.params.sh
index 74ad6645fa..231310d8e5 100644
--- a/qb/qb.params.sh
+++ b/qb/qb.params.sh
@@ -91,16 +91,17 @@ parse_input()
 
    while [ ! -z "$1" ]
    do
-      prefix="`echo $1 | sed -e 's|^--prefix=\(\S\S*\)$|\1|' -e 's|\(\S\S*\)/|\1|'`"
-
-      if [ "$prefix" != "$1" ]; then
-         PREFIX="$prefix"
-         shift
-         continue
-      fi
-
+      
       case "$1" in
 
+         --prefix=*)
+            prefix="`echo $1 | sed -e 's|^--prefix=\(\S\S*\)$|\1|' -e 's|\(\S\S*\)/$|\1|'`"
+
+            if [ "$prefix" != "$1" ]; then
+               PREFIX="$prefix"
+            fi
+            ;;
+
          --enable-*)
             enable=`echo $1 | sed 's|^--enable-||'`
             if [ -z "`echo $COMMAND_LINE_OPTS_ENABLE | grep -i $enable`" ]; then