diff --git a/build.nix b/build.nix
index c50b744..1dde085 100644
--- a/build.nix
+++ b/build.nix
@@ -227,12 +227,11 @@ with rec
     # anything changes all the deps will be rebuilt.  The rustc compiler is
     # pretty fast so this is not too bad. In the future we'll want to pre-build
     # the crates and give cargo a pre-populated ./target directory.
-    # TODO: this should most likely take more than one packageName
-    mkSnapshotForest = packageName:
+    mkSnapshotForest =
       symlinkJoin
         { name = "crates-io";
           paths = map (v: unpackCrate v.name v.version v.sha256)
-            (libb.mkVersions packageName cargolock);
+            (libb.mkVersions cargolock);
         };
 
     # All the Cargo.tomls, including the top-level one
@@ -252,7 +251,7 @@ with rec
       { source =
           { crates-io = { replace-with = "nix-sources"; } ;
             nix-sources =
-              { directory = mkSnapshotForest (lib.head crateNames) ; };
+              { directory = mkSnapshotForest; };
           };
       };
   };
diff --git a/default.nix b/default.nix
index 0be42e4..2dba6e8 100644
--- a/default.nix
+++ b/default.nix
@@ -43,7 +43,7 @@ with rec
 #              # Really this should be 'buildPackageIncremental' but that makes
 #              # Nix segfault
 #              buildPackage (libb.dummySrc depName depVersion)
-#                { cargoBuild = "cargo build --release -p ${depName}:${depVersion} -j $NIX_BUILD_CORES";
+#                { cargoBuild = "cargo build --$CARGO_BUILD_PROFILE -p ${depName}:${depVersion} -j $NIX_BUILD_CORES";
 #                  inherit (attrs) cargo;
 #                  cargotomlPath = libb.writeTOML (libb.cargotomlFor depName depVersion);
 #                  cargolockPath = libb.writeTOML (
diff --git a/lib.nix b/lib.nix
index 10c1371..aa679e9 100644
--- a/lib.nix
+++ b/lib.nix
@@ -3,7 +3,7 @@ rec
 {
     # creates an attrset from package name to package version + sha256
     # (note: this includes the package's dependencies)
-    mkVersions = packageName: cargolock:
+    mkVersions = cargolock:
       if builtins.hasAttr "metadata" cargolock then
 
         # TODO: this should nub by <pkg-name>-<pkg-version>
@@ -16,7 +16,7 @@ rec
           ) ++ (lib.concatMap (parseDependency cargolock) (x.dependencies or []))
 
         )
-        (builtins.filter (v: v.name != packageName) cargolock.package))
+        cargolock.package)
       else [];
 
     # Turns "lib-name lib-ver (registry+...)" to [ { name = "lib-name", etc } ]