diff --git a/config/functions b/config/functions
index d525e7e17e..e5b9ec9822 100644
--- a/config/functions
+++ b/config/functions
@@ -765,6 +765,22 @@ check_path() {
   fi
 }
 
+load_build_config() {
+  if [ -d "${1}" -a -f ${1}/.build.conf ]; then
+    source ${1}/.build.conf
+    return 0
+  fi
+  return 1
+}
+
+save_build_config() {
+  local var
+  rm -f ${BUILD}/.build.conf
+  for var in PROJECT DEVICE ARCH DEBUG BUILD_SUFFIX; do
+    echo "export ${var}=\"${!var}\"" >> ${BUILD}/.build.conf
+  done
+}
+
 check_config() {
   dashes="==========================="
   if [ ! -d $PROJECT_DIR/$PROJECT ]; then
diff --git a/scripts/build b/scripts/build
index fc62914075..dfd9cdbc61 100755
--- a/scripts/build
+++ b/scripts/build
@@ -20,6 +20,15 @@
 
 . config/options $1
 
+if [ "$1" = "--all" ]; then
+  if [ ! -z "$2" ]; then
+    for build_dir in $(ls -1d ${ROOT}/build.*); do
+      load_build_config ${build_dir} && ./scripts/build $2
+    done
+  fi
+  exit 0
+fi
+
 if [ -z "$1" ]; then
   echo "usage: $0 package_name[:<host|target|init|bootstrap>]"
   exit 1
diff --git a/scripts/clean b/scripts/clean
index 4211c31c6e..e4fedd87dc 100755
--- a/scripts/clean
+++ b/scripts/clean
@@ -48,14 +48,8 @@ clean_package() {
 
 if [ "$1" = "--all" ]; then
   if [ ! -z "$2" ]; then
-    for PROJECT in $(ls -1 projects); do
-      for archfile in projects/$PROJECT/linux/linux.*.conf; do
-        if [ ! -f "$archfile" ]; then
-          archfile="$(ls -1 projects/$PROJECT/linux/*/linux.*.conf | head -1)"
-        fi
-        ARCH=`echo $archfile | sed -n '$s/\.conf//;$s/.*\.//p'`
-        PROJECT=$PROJECT ARCH=$ARCH ./scripts/clean $2
-      done
+    for build_dir in $(ls -1d ${ROOT}/build.*); do
+      load_build_config "${build_dir}" && ./scripts/clean $2
     done
   fi
 else
diff --git a/scripts/image b/scripts/image
index c2695ed91f..8859ecab80 100755
--- a/scripts/image
+++ b/scripts/image
@@ -25,6 +25,8 @@ unset _CACHE_PACKAGE_LOCAL _CACHE_PACKAGE_GLOBAL _DEBUG_DEPENDS_LIST _DEBUG_PACK
 . config/show_config
 show_config
 
+save_build_config
+
 setup_toolchain target
 
 $SCRIPTS/checkdeps