Clifford Wolf:

package/avm/xfce4/xfce4.conf

@@ -21,7 +21,7 @@
 # --- ROCK-COPYRIGHT-NOTE-END ---
 
 if [ "$prefix_auto" = 1 ] ; then
-    prefix=$ROCKCFG_PKG_XFCE4_CORE_PREFIX
+    prefix=${ROCKCFG_PKG_XFCE4_CORE_PREFIX:-usr}
     set_confopt
 fi
 

package/e17/imlib2/e17.conf

@@ -1,6 +1,6 @@
 
 if [ "$prefix_auto" = 1 ] ; then
-	prefix=$ROCKCFG_PKG_E17_CORE_PREFIX
+	prefix=${ROCKCFG_PKG_E17_CORE_PREFIX:-usr}
 	for dir in opt/e17 usr $ROCKCFG_PKG_E17_CORE_PREFIX ; do
 		[ -f "$root/$dir/lib/libImlib2.so" ] && prefix="$dir"
 	done

package/gnome14/gnome-14.conf

@@ -22,7 +22,7 @@
 
 if [ "$prefix_auto" = 1 ] ; then
   if [ "$NO_SANITY_CHECK" ] ; then
-	prefix=$ROCKCFG_PKG_GNOME14_CORE_PREFIX
+	prefix=${ROCKCFG_PKG_GNOME14_CORE_PREFIX:-usr}
   else 
 	for dir in usr opt/gnome $ROCKCFG_PKG_GNOME14_CORE_PREFIX ; do
 		[ -f "$root/$dir/lib/libglib.so" ] && prefix="$dir"

package/gnome2/gnome-2.conf

@@ -23,7 +23,7 @@
 
 if [ "$prefix_auto" = 1 ] ; then
   if [ "$NO_SANITY_CHECK" ] ; then
-	prefix=$ROCKCFG_PKG_GNOME2_CORE_PREFIX
+	prefix=${ROCKCFG_PKG_GNOME2_CORE_PREFIX:-usr}
   else 
 	for dir in usr opt/gnome2 $ROCKCFG_PKG_GNOME2_CORE_PREFIX ; do
 		[ -f "$root/$dir/lib/libglib-2.0.so" ] && prefix="$dir"

package/kde/kde-3.conf

@@ -1,7 +1,7 @@
 
 if [ "$prefix_auto" = 1 ] ; then
   if [ "$NO_SANITY_CHECK" ] ; then
-	prefix=$ROCKCFG_PKG_KDE3_CORE_PREFIX
+	prefix=${ROCKCFG_PKG_KDE3_CORE_PREFIX:-usr}
   else 
 	for dir in usr $ROCKCFG_PKG_KDE3_CORE_PREFIX ; do
 		[ -f "$root/$dir/bin/artsd" ] && prefix="$dir"

package/tschmidt/unreal-ircd/unreal-ircd.conf

@@ -22,7 +22,7 @@
 
 
 if [ "$prefix_auto" = 1 ] ; then
-	prefix=$ROCKCFG_PKG_UNREAL_PREFIX
+	prefix=${ROCKCFG_PKG_UNREAL_PREFIX:-usr}
 fi
 if [ "$ROCKCFG_PKG_UNREAL_DMODS" = 1 ] ; then
 	extraconfopt="$extraconfopt --enable-dynamic-linking"