diff --git a/flake.nix b/flake.nix
index 7ad19a85..e4673bf8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -60,10 +60,10 @@
           in {
             or-tools_9_11 = callPackage ./nix/or-tools_9_11.nix {
               inherit (pkgs'.darwin) DarwinTools;
-              clangStdenv =
+              stdenv =
                 if pkgs'.system == "x86_64-darwin"
-                then (pkgs'.overrideSDK pkgs'.clangStdenv "11.0")
-                else pkgs'.clangStdenv;
+                then (pkgs'.overrideSDK pkgs'.stdenv "11.0")
+                else pkgs'.stdenv;
             };
             colab-env = callPackage ./nix/colab-env.nix {};
             opensta = callPackage ./nix/opensta.nix {};
diff --git a/nix/openroad.nix b/nix/openroad.nix
index e9712999..a10c3fdb 100644
--- a/nix/openroad.nix
+++ b/nix/openroad.nix
@@ -46,6 +46,7 @@
   ninja,
   git,
   rev ? "1d610077e69607c430ffedd0dc6034c6af701a39",
+  rev-date ? "2024-12-05",
   sha256 ? "sha256-jkyugDqA5I54Xozdf6xbajCmghNt3rF0srzGMzcKxQ8=",
   # environments,
   openroad,
@@ -54,8 +55,8 @@
   stdenv = llvmPackages_17.stdenv;
 in
   stdenv.mkDerivation (finalAttrs: {
-    name = "openroad";
-    inherit rev;
+    pname = "openroad";
+    version = rev-date;
 
     src = fetchFromGitHub {
       owner = "The-OpenROAD-Project";
diff --git a/nix/or-tools_9_11.nix b/nix/or-tools_9_11.nix
index 8c73f6c4..611e37ab 100644
--- a/nix/or-tools_9_11.nix
+++ b/nix/or-tools_9_11.nix
@@ -49,13 +49,14 @@
   pkg-config,
   protobuf,
   re2,
-  clangStdenv,
+  stdenv,
   swig,
   unzip,
   zlib,
   highs,
 }:
-clangStdenv.mkDerivation (finalAttrs: {
+# can't use clang on linux: https://github.com/abseil/abseil-cpp/issues/1747
+stdenv.mkDerivation (finalAttrs: {
   pname = "or-tools";
   version = "9.11";
 
@@ -68,8 +69,9 @@ clangStdenv.mkDerivation (finalAttrs: {
 
   cmakeFlags =
     [
-      "-DBUILD_DEPS=OFF"
-      "-DBUILD_absl=OFF"
+      "-DBUILD_DEPS:BOOL=OFF"
+      "-DBUILD_SAMPLES:BOOL=OFF"
+      "-DBUILD_EXAMPLES:BOOL=OFF"
       "-DCMAKE_INSTALL_BINDIR=bin"
       "-DCMAKE_INSTALL_INCLUDEDIR=include"
       "-DCMAKE_INSTALL_LIBDIR=lib"
@@ -77,7 +79,7 @@ clangStdenv.mkDerivation (finalAttrs: {
       "-DUSE_SCIP=OFF"
       "-DPROTOC_PRG=${protobuf}/bin/protoc"
     ]
-    ++ lib.optionals clangStdenv.hostPlatform.isDarwin ["-DCMAKE_MACOSX_RPATH=OFF"];
+    ++ lib.optionals stdenv.hostPlatform.isDarwin ["-DCMAKE_MACOSX_RPATH=OFF"];
 
   strictDeps = true;
 
@@ -89,7 +91,7 @@ clangStdenv.mkDerivation (finalAttrs: {
       swig
       unzip
     ]
-    ++ lib.optionals clangStdenv.hostPlatform.isDarwin [
+    ++ lib.optionals stdenv.hostPlatform.isDarwin [
       DarwinTools
     ];