diff --git a/DECISIONS.md b/DECISIONS.md
index 75dc990..7ccefbb 100644
--- a/DECISIONS.md
+++ b/DECISIONS.md
@@ -1,5 +1,11 @@
 # Decisions
 
+## 2026-04-23 – Rust PKGBUILDs honour CARGO_TARGET_DIR
+- **Who**: Dominik, ClaudeCode
+- **Why**: The act_runner container sets `CARGO_TARGET_DIR=/cache/target` (for cross-build cache persistence), but `moongreet-git`/`moonlock-git`/`moonset-git` `package()` hardcoded `target/release/<bin>`. Run 87 compiled for 8 min and then failed at `install: cannot stat 'target/release/moongreet'` because the binary actually lived in `/cache/target/release/`. Silent until today because earlier builds pre-date the env var.
+- **Tradeoffs**: None meaningful — the fallback `${CARGO_TARGET_DIR:-target}` preserves local `makepkg` builds (no env var → still reads from `./target/`).
+- **How**: Patched `install -Dm755` in all three Rust-app PKGBUILDs to use `"${CARGO_TARGET_DIR:-target}/release/<bin>"`.
+
 ## 2026-04-23 – Single-threaded, low-priority build in CI to keep the Gitea host alive
 - **Who**: Dominik, ClaudeCode
 - **Why**: The act_runner container shares CPU/RAM/I/O with the Gitea host (network-host mode, no resource limits). Parallel Rust builds OOM-kill or thrash the host: run 86 (2026-04-23, moongreet-git 0.8.3.r1) stopped mid-compile at `Compiling gio v0.22.2` with no error, and gitea HTTPS was unreachable for ~11 min. Same pattern on 2026-04-20. Runner-side resource limits would be better, but require host-side config changes; a pipeline-side fix is portable and low-risk.
diff --git a/moongreet-git/PKGBUILD b/moongreet-git/PKGBUILD
index 4c59ec4..1642bab 100644
--- a/moongreet-git/PKGBUILD
+++ b/moongreet-git/PKGBUILD
@@ -40,7 +40,7 @@ build() {
 
 package() {
     cd "$srcdir/greetd-moongreet"
-    install -Dm755 target/release/moongreet "$pkgdir/usr/bin/moongreet"
+    install -Dm755 "${CARGO_TARGET_DIR:-target}/release/moongreet" "$pkgdir/usr/bin/moongreet"
 
     # Greeter config
     install -Dm644 config/moongreet.toml "$pkgdir/etc/moongreet/moongreet.toml"
diff --git a/moonlock-git/PKGBUILD b/moonlock-git/PKGBUILD
index d3ad379..f938ed2 100644
--- a/moonlock-git/PKGBUILD
+++ b/moonlock-git/PKGBUILD
@@ -46,7 +46,7 @@ build() {
 
 package() {
     cd "$srcdir/moonlock"
-    install -Dm755 target/release/moonlock "$pkgdir/usr/bin/moonlock"
+    install -Dm755 "${CARGO_TARGET_DIR:-target}/release/moonlock" "$pkgdir/usr/bin/moonlock"
 
     # PAM configuration
     install -Dm644 config/moonlock-pam "$pkgdir/etc/pam.d/moonlock"
diff --git a/moonset-git/PKGBUILD b/moonset-git/PKGBUILD
index 56d0211..a559391 100644
--- a/moonset-git/PKGBUILD
+++ b/moonset-git/PKGBUILD
@@ -38,7 +38,7 @@ build() {
 
 package() {
     cd "$srcdir/moonset"
-    install -Dm755 target/release/moonset "$pkgdir/usr/bin/moonset"
+    install -Dm755 "${CARGO_TARGET_DIR:-target}/release/moonset" "$pkgdir/usr/bin/moonset"
 
     # Example config
     install -Dm644 config/moonset.toml "$pkgdir/etc/moonset/moonset.toml.example"