diff --git a/build b/build
index 4d4e404..d8ff44c 100755
--- a/build
+++ b/build
@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
+# generate this file from Nix config for now to avoid duplication?
+
 cargo build --manifest-path ./rust/Cargo.toml
 
 BUNDLED_LIB_DIR=$(cabal list-bin . | sed -e 's=x/garnet/build/garnet/garnet=build=g')
diff --git a/flake.nix b/flake.nix
index 7f9080f..6666890 100644
--- a/flake.nix
+++ b/flake.nix
@@ -49,6 +49,7 @@
             };
             packages.garnet.components.library = {
               preBuild = addLibcIncludeDir;
+              # try removing?
               preConfigure = ''
                 mkdir -p rust/target/debug
                 ln -s ${garnet-rs}/include/garnet_rs.h rust/target/debug/garnet_rs.h
diff --git a/garnet.cabal b/garnet.cabal
index c30432f..e03988e 100644
--- a/garnet.cabal
+++ b/garnet.cabal
@@ -14,6 +14,14 @@ extra-source-files:
 -- extra-tmp-files:
 --     rust/target/debug/garnet_rs.h
 
+-- actually maybe this is pointless given we always need debug path anyway in `extra-source-files`
+-- plus we have it in `Raw.hs`
+flag dev
+  default:
+    False
+  manual:
+    True
+
 common common
     default-language: GHC2024
     default-extensions:
@@ -50,6 +58,8 @@ library
         GarnetRs.Raw
         GarnetRs.Wrapped
     hs-source-dirs: lib
+    -- if flag (dev)
+        -- include-dirs: rust/target/debug
     include-dirs: rust/target/debug
     -- HLS gives up entirely when the header is malformed if we do this
     -- and anyway, I don't think it gives us dependency tracking like `extra-source-files` does