diff --git a/.bazelrc b/.bazelrc
index 25e891c..4396e0e 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -3,7 +3,7 @@ build --@rules_cuda//cuda:enable_cuda
 build --@rules_cuda//cuda:copts=-std=c++17
 build --repo_env=CUDA_DIR=/opt/cuda
 build --repo_env=CUDA_PATH=/opt/cuda
-#build --repo_env=CC=gcc-12
+build --repo_env=CC=gcc-12
 # TODO: check whether both env var are needed
 build --action_env=CUDA_PATH=/opt/cuda
 #build --action_env=CC=gcc-12
diff --git a/README.md b/README.md
index 1343ddf..f1eab0d 100644
--- a/README.md
+++ b/README.md
@@ -239,6 +239,13 @@ To visualize the run:
 python main.py --run viz --config.save_dir _exp/bh76,6-31g+lda_x,3aahmyt0
 ```
 
+# CUDA dev guide
+``` shell
+bazel build //...
+bazel run //d4ft/native/obara_saika:eri_test
+bazel test --test_output=all //tests/native/xla:example_test 
+```
+
 ## Tutorial and Documentation
 
 ### Viewing in the Browser
diff --git a/d4ft/native/gamma/BUILD b/d4ft/native/gamma/BUILD
index 3984b36..73abe29 100644
--- a/d4ft/native/gamma/BUILD
+++ b/d4ft/native/gamma/BUILD
@@ -19,7 +19,7 @@ cc_library(
     name = "constants",
     hdrs = ["constants.h"],
     deps = [
-        # "@cuda//:cudart_static",
+        "@cuda//:cudart_static",
         "@hemi",
     ],
 )
diff --git a/d4ft/native/gamma/igamma.h b/d4ft/native/gamma/igamma.h
index 4fb8996..89ddc7e 100644
--- a/d4ft/native/gamma/igamma.h
+++ b/d4ft/native/gamma/igamma.h
@@ -129,7 +129,7 @@ HEMI_DEV_CALLABLE FLOAT IgammacContinuedFraction(FLOAT ax, FLOAT x, FLOAT a,
       dqkm2_da = dqkm2_da * HEMI_CONSTANT(eps)<FLOAT>;
       dqkm1_da = dqkm1_da * HEMI_CONSTANT(eps)<FLOAT>;
     }
-    FLOAT conditional;
+    // FLOAT conditional;
     if (mode == VALUE) {
       enabled = (enabled && t > HEMI_CONSTANT(eps) < FLOAT >);
     } else {
diff --git a/d4ft/native/obara_saika/BUILD b/d4ft/native/obara_saika/BUILD
index 1f00221..2cdd116 100644
--- a/d4ft/native/obara_saika/BUILD
+++ b/d4ft/native/obara_saika/BUILD
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 load("@rules_cc//cc:defs.bzl", "cc_library")
-# load("@rules_cuda//cuda:defs.bzl", "cuda_library")
+load("@rules_cuda//cuda:defs.bzl", "cuda_library")
 
 package(default_visibility = ["//visibility:public"])
 
@@ -42,38 +42,38 @@ cc_library(
     ],
 )
 
-# cuda_library(
-#     name = "eri_kernel",
-#     srcs = ["eri_kernel.cu"],
-#     hdrs = ["eri_kernel.h"],
-#     copts = [
-#         "--expt-extended-lambda",
-#         "--expt-relaxed-constexpr",
-#     ],
-#     linkopts = [
-#         "-lstdc++",
-#     ],
-#     deps = [
-#         ":eri",
-#         "@hemi",
-#     ],
-# )
+cuda_library(
+    name = "eri_kernel",
+    srcs = ["eri_kernel.cu"],
+    hdrs = ["eri_kernel.h"],
+    copts = [
+        "--expt-extended-lambda",
+        "--expt-relaxed-constexpr",
+    ],
+    linkopts = [
+        "-lstdc++",
+    ],
+    deps = [
+        ":eri",
+        "@hemi",
+    ],
+)
 
-# cc_binary(
-#     name = "eri_test",
-#     srcs = ["eri_test.cc"],
-#     deps = [
-#         ":eri_kernel",
-#         # "@cuda//:cudart_static",
-#         "@hemi",
-#     ],
-# )
+cc_binary(
+    name = "eri_test",
+    srcs = ["eri_test.cc"],
+    deps = [
+        ":eri_kernel",
+        "@cuda//:cudart_static",
+        "@hemi",
+    ],
+)
 
-# cc_binary(
-#     name = "boys_test",
-#     srcs = ["boys_test.cc"],
-#     deps = [
-#         ":boys",
-#         # "@cuda//:cudart_static",
-#     ],
-# )
+cc_binary(
+    name = "boys_test",
+    srcs = ["boys_test.cc"],
+    deps = [
+        ":boys",
+        "@cuda//:cudart_static",
+    ],
+)
diff --git a/d4ft/native/xla/BUILD b/d4ft/native/xla/BUILD
index 65a10ae..7e61822 100644
--- a/d4ft/native/xla/BUILD
+++ b/d4ft/native/xla/BUILD
@@ -26,7 +26,7 @@ cc_library(
     hdrs = ["custom_call.h"],
     deps = [
         ":specs",
-        # "@cuda//:cudart_static",
+        "@cuda//:cudart_static",
     ],
 )
 
diff --git a/tests/native/xla/BUILD b/tests/native/xla/BUILD
index f857a52..8a452bf 100644
--- a/tests/native/xla/BUILD
+++ b/tests/native/xla/BUILD
@@ -12,7 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# load("@rules_cuda//cuda:defs.bzl", "cuda_library")
+load("@rules_cuda//cuda:defs.bzl", "cuda_library")
+load("@pip_requirements//:requirements.bzl", "requirement")
+load("@pybind11_bazel//:build_defs.bzl", "pybind_extension")
+load("@rules_python//python:defs.bzl", "py_test")
 
 package(default_visibility = ["//visibility:public"])
 
@@ -27,43 +30,43 @@ cc_library(
     ],
 )
 
-# cuda_library(
-#     name = "example_cu",
-#     srcs = ["example.cu"],
-#     copts = [
-#         "--std=c++17",
-#     ],
-#     deps = [
-#         ":example_h",
-#         # "@cuda//:cudart_static",
-#     ],
-# )
+cuda_library(
+    name = "example_cu",
+    srcs = ["example.cu"],
+    copts = [
+        "--std=c++17",
+    ],
+    deps = [
+        ":example_h",
+        "@cuda//:cudart_static",
+    ],
+)
 
-# pybind_extension(
-#     name = "example",
-#     srcs = [
-#         "example.cc",
-#     ],
-#     copts = [
-#         "--std=c++17",
-#     ],
-#     deps = [
-#         ":example_cu",
-#         "//d4ft/native/xla:custom_call_h",
-#     ],
-# )
+pybind_extension(
+    name = "example",
+    srcs = [
+        "example.cc",
+    ],
+    copts = [
+        "--std=c++17",
+    ],
+    deps = [
+        ":example_cu",
+        "//d4ft/native/xla:custom_call_h",
+    ],
+)
 
-# py_test(
-#     name = "example_test",
-#     srcs = ["example_test.py"],
-#     data = [
-#         ":example.so",
-#         # "@cuda//:bin",
-#     ],
-#     deps = [
-#         "//d4ft/native/xla:custom_call",
-#         requirement("absl-py"),
-#         requirement("jax"),
-#         requirement("jaxlib"),
-#     ],
-# )
+py_test(
+    name = "example_test",
+    srcs = ["example_test.py"],
+    data = [
+        ":example.so",
+        "@cuda//:bin",
+    ],
+    deps = [
+        "//d4ft/native/xla:custom_call",
+        requirement("absl-py"),
+        requirement("jax"),
+        requirement("jaxlib"),
+    ],
+)
diff --git a/third_party/pip_requirements/requirements-dev.txt b/third_party/pip_requirements/requirements-dev.txt
index 9a8d525..fdc05db 100644
--- a/third_party/pip_requirements/requirements-dev.txt
+++ b/third_party/pip_requirements/requirements-dev.txt
@@ -3,8 +3,8 @@ bs4==0.0.1
 dm-haiku>=0.0.10
 einops==0.6.1
 jax-xc>=0.0.7
-# --find-links https://storage.googleapis.com/jax-releases/jax_cuda_releases.html
-# jax[cuda12_local]==0.4.13
+--find-links https://storage.googleapis.com/jax-releases/jax_cuda_releases.html
+jax[cuda12_local]==0.4.13
 jax>=0.4.13
 jaxlib>=0.3.25
 jaxtyping==0.2.15