diff --git a/pkgs/build-support/substitute/substitute-all.sh b/pkgs/build-support/substitute/substitute-all.sh
index 3d3999ad520..796a1a47152 100644
--- a/pkgs/build-support/substitute/substitute-all.sh
+++ b/pkgs/build-support/substitute/substitute-all.sh
@@ -1,5 +1,7 @@
 source $stdenv/setup
 
+eval "$preInstall"
+
 args=
 
 target=$out
@@ -13,3 +15,5 @@ substituteAll $src $target
 if test -n "$isExecutable"; then
     chmod +x $target
 fi
+
+eval "$postInstall"