diff --git a/home/jashton.nix b/home/jashton.nix
index 975b696..ab47385 100644
--- a/home/jashton.nix
+++ b/home/jashton.nix
@@ -103,7 +103,13 @@ in
         exit 1
       fi
 
-      javac -g --release 21 -encoding UTF-8 -d bin -cp "lib/*" @"$SOURCES_FILE"
+      # Source roots for every top-level package (assignments/assign04 -> package assign04, etc.).
+      # Needed so javac can resolve cross-package imports (eg. assign04 -> timing) and
+      # transitively compile whatever those imports require, even though TARGET_DIR only
+      # covers one subtree.
+      SOURCEPATH="assignments:labs:timing:playground:src"
+
+      javac -g --release 21 -encoding UTF-8 -d bin -cp "lib/*" -sourcepath "$SOURCEPATH" @"$SOURCES_FILE"
     '')
 
     (pkgs.writeShellScriptBin "jclean" ''
diff --git a/system/packages.nix b/system/packages.nix
index 841ba64..3826efa 100644
--- a/system/packages.nix
+++ b/system/packages.nix
@@ -19,6 +19,7 @@ in
     btop
     dconf
     deskflow
+    direnv
     fastfetch
     firefox
     gemini-cli
@@ -45,6 +46,7 @@ in
     nautilus
     networkmanagerapplet
     nitrogen
+    nix-direnv
     unstable.ollama
     pasystray
     playerctl
@@ -111,11 +113,14 @@ in
     '')
   ];
 
+  programs.direnv.enable = true;
+  programs.direnv.nix-direnv.enable = true;
+
   programs.steam = {
     enable = true;
     remotePlay.openFirewall = true;
     dedicatedServer.openFirewall = true;
     localNetworkGameTransfers.openFirewall = true;
-    gamescopeSession.enable = true; # Useful for rendering Palworld at downscaled 1080p
+    gamescopeSession.enable = true;
   };
 }