diff --git a/support/build b/support/build
index a1073ce..1732dca 100755
--- a/support/build
+++ b/support/build
@@ -106,8 +106,8 @@ function build_images() {
     for image in "$@"; do
         case "$image" in
         rundk)
+            [ -n "$Config" ] && export RUNDK_FORCE_BUILDENV="$Config"
             local -a args=(--bootstrap)
-            [ -n "$Config" ] && args+=(--config "$Config")
             [ -z "$ForceBuild" ] && args+=(--unless-exists)
             [ -n "$Pull" ] && args+=(--pull)
             [ -n "$NoCache" ] && args+=(--no-cache)
@@ -148,9 +148,14 @@ args=(
 )
 parse_args "$@"; set -- "${args[@]}"
 
-[ -n "$Config" ] && setx Config=abspath "$Config"
-
-build_check_env || die
+if [ -n "$Config" ]; then
+    setx Config=abspath "$Config"
+    # pas de vérification d'environnement si on spécifie Config
+    # ne pas oublier d'implémenter un traitement spécifique si build_check_env()
+    # contient d'autres vérifications
+else
+    build_check_env || die
+fi
 [ "$action" == none ] && exit 0
 
 case "$action" in
diff --git a/support/rundk.2postamble b/support/rundk.2postamble
index 4a2c960..7cf1ed0 100644
--- a/support/rundk.2postamble
+++ b/support/rundk.2postamble
@@ -185,7 +185,10 @@ if [ -z "$_RUNDK_IN_DOCKER" ]; then
 
     IMAGE=
     if [ -z "$bootstrap" ]; then
-        if [ -n "$BUILDENV" -a -f "$PROJDIR/$BUILDENV" ]; then
+        if [ -n "$RUNDK_FORCE_BUILDENV" ]; then
+            source "$RUNDK_FORCE_BUILDENV" || exit 1
+            after_source_buildenv
+        elif [ -n "$BUILDENV" -a -f "$PROJDIR/$BUILDENV" ]; then
             source "$PROJDIR/$BUILDENV" || exit 1
             after_source_buildenv
         elif [ -n "$BUILDENV0" -a -f "$PROJDIR/$BUILDENV0" ]; then
@@ -215,7 +218,9 @@ if [ -z "$_RUNDK_IN_DOCKER" ]; then
         args="$(getopt -n "$MYNAME" -o "$SOPTS" -l "$LOPTS" -- "$@")" || exit 1; eval "set -- $args"
 
         Dist=
-        if [ -n "$BUILDENV" -a -f "$PROJDIR/$BUILDENV" ]; then
+        if [ -n "$RUNDK_FORCE_BUILDENV" ]; then
+            Config="$RUNDK_FORCE_BUILDENV"
+        elif [ -n "$BUILDENV" -a -f "$PROJDIR/$BUILDENV" ]; then
             Config="$PROJDIR/$BUILDENV"
         elif [ -n "$BUILDENV0" -a -f "$PROJDIR/$BUILDENV0" ]; then
             Config="$PROJDIR/$BUILDENV0"