diff --git a/pkgs/development/compilers/hare/hare.nix b/pkgs/development/compilers/hare/hare.nix
index fe0cc2872a11..e24fc68ab422 100644
--- a/pkgs/development/compilers/hare/hare.nix
+++ b/pkgs/development/compilers/hare/hare.nix
@@ -37,6 +37,7 @@ stdenv.mkDerivation rec {
     qbe
   ];
 
+  setupHook = ./setup-hook.sh;
   strictDeps = true;
 
   configurePhase =
diff --git a/pkgs/development/compilers/hare/setup-hook.sh b/pkgs/development/compilers/hare/setup-hook.sh
new file mode 100644
index 000000000000..d2d2c34354d6
--- /dev/null
+++ b/pkgs/development/compilers/hare/setup-hook.sh
@@ -0,0 +1,9 @@
+addHarepath () {
+    for haredir in third-party stdlib; do
+        if [[ -d "$1/src/hare/$haredir" ]]; then
+            addToSearchPath HAREPATH "$1/src/hare/$haredir"
+        fi
+    done
+}
+
+addEnvHooks "$hostOffset" addHarepath