diff --git a/hosts/lolcathost/default.nix b/hosts/lolcathost/default.nix
index 12125e5..02bd30f 100755
--- a/hosts/lolcathost/default.nix
+++ b/hosts/lolcathost/default.nix
@@ -198,12 +198,17 @@ in {
   };
 
   # ---- ENVIRONMENT VARIABLES ----
-  environment.sessionVariables = {
-    # folder names with capitalisation look awful!
-    XDG_DOWNLOAD_DIR = "$HOME/downloads";
+  environment = {
+    # always install "dev" derivation outputs
+    extraOutputsToInstall = ["dev"];
 
-    # Hint Electrons apps to use Wayland
-    NIXOS_OZONE_WL = "1";
+    sessionVariables = {
+      # folder names with capitalisation look awful!
+      XDG_DOWNLOAD_DIR = "$HOME/downloads";
+
+      # Hint Electrons apps to use Wayland
+      NIXOS_OZONE_WL = "1";
+    };
   };
 
   # ---- SYSTEM PACKAGES -----
diff --git a/hosts/myputer/default.nix b/hosts/myputer/default.nix
index ea5710a..ce1c838 100755
--- a/hosts/myputer/default.nix
+++ b/hosts/myputer/default.nix
@@ -191,12 +191,17 @@ in {
   };
 
   # ---- ENVIRONMENT VARIABLES ----
-  environment.sessionVariables = {
-    # folder names with capitalisation look awful!
-    XDG_DOWNLOAD_DIR = "$HOME/downloads";
+  environment = {
+    # always install "dev" derivation outputs
+    extraOutputsToInstall = ["dev"];
 
-    # Hint Electrons apps to use Wayland
-    NIXOS_OZONE_WL = "1";
+    sessionVariables = {
+      # folder names with capitalisation look awful!
+      XDG_DOWNLOAD_DIR = "$HOME/downloads";
+
+      # Hint Electrons apps to use Wayland
+      NIXOS_OZONE_WL = "1";
+    };
   };
 
   # ---- SYSTEM PACKAGES -----