diff --git a/pkgs/stdenv/generic/setup.sh b/pkgs/stdenv/generic/setup.sh
index 321e2673cad..66be3875413 100644
--- a/pkgs/stdenv/generic/setup.sh
+++ b/pkgs/stdenv/generic/setup.sh
@@ -386,6 +386,13 @@ substituteAll() {
 }
 
 
+substituteAllInPlace() {
+    local fileName="$1"
+    shift
+    substituteAll "$fileName" "$fileName" "$@"
+}
+
+
 ######################################################################
 # What follows is the generic builder.