diff --git a/.cargo/config.toml b/.cargo/config.toml
index 40eddf62..af86330d 100644
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@@ -3,3 +3,7 @@ rustflags = ["-C", "target-cpu=x86-64-v3"]
 
 [target.'cfg(target_arch = "aarch64")']
 rustflags = ["-C", "target-cpu=cortex-a76"]
+
+[env]
+CC = "clang"
+CXX = "clang++"
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 257e76df..92c386dd 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,6 +10,7 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
+  LLVM_VERSION: "20.1"
 
 jobs:
   build-linux:
@@ -44,6 +45,10 @@ jobs:
             libegl1-mesa-dev libdbus-1-dev libibus-1.0-dev libudev-dev fcitx-libs-dev \
             libpipewire-0.3-dev libwayland-dev libdecor-0-dev liburing-dev
           version: ${{ matrix.target }}-1.0
+      - name: Install LLVM and Clang
+        uses: KyleMayes/install-llvm-action@v2
+        with:
+          version: "${{ env.LLVM_VERSION }}"
       - name: Build
         run: |
           cargo build --release -v --target=${{ matrix.target }}
@@ -75,11 +80,19 @@ jobs:
         with:
           target: ${{ matrix.target }}
           rustflags: ""
+      - name: Install LLVM and Clang
+        uses: KyleMayes/install-llvm-action@v2
+        with:
+          version: "${{ env.LLVM_VERSION }}"
       - name: Build
         run: |
           cargo build --release -v --target=${{ matrix.target }}
           mkdir output
           cp target/${{ matrix.target }}/release/gopher64.exe output/gopher64-${{ matrix.arch }}.exe
+        env:
+          CC: clang-cl
+          CXX: clang-cl
+          AR: llvm-lib
       - name: Upload file
         uses: actions/upload-artifact@v4
         with:
@@ -87,6 +100,7 @@ jobs:
           path: output/gopher64-${{ matrix.arch }}.exe
 
   build-macos:
+    if: false
     runs-on: macos-15
     strategy:
       fail-fast: false
diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 96182d36..50bc48fd 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -11,6 +11,7 @@ permissions:
 
 env:
   CARGO_TERM_COLOR: always
+  LLVM_VERSION: "20.1"
 
 jobs:
   lint-linux:
@@ -34,6 +35,10 @@ jobs:
             libegl1-mesa-dev libdbus-1-dev libibus-1.0-dev libudev-dev fcitx-libs-dev \
             libpipewire-0.3-dev libwayland-dev libdecor-0-dev liburing-dev
           version: lint-1.0
+      - name: Install LLVM and Clang
+        uses: KyleMayes/install-llvm-action@v2
+        with:
+          version: "${{ env.LLVM_VERSION }}"
       - name: Rustfmt Check
         uses: actions-rust-lang/rustfmt@v1
       - name: Lint
diff --git a/build.rs b/build.rs
index 80dca07e..01765727 100644
--- a/build.rs
+++ b/build.rs
@@ -62,46 +62,21 @@ fn main() {
 
     let os = std::env::var("CARGO_CFG_TARGET_OS").unwrap();
     let arch = std::env::var("CARGO_CFG_TARGET_ARCH").unwrap();
-    let env = std::env::var("CARGO_CFG_TARGET_ENV").unwrap();
+    if arch == "x86_64" {
+        build.flag("-march=x86-64-v3");
+    } else if arch == "aarch64" {
+        build.flag("-march=armv8.2-a");
+        simd_build.flag("-march=armv8.2-a");
+    } else {
+        panic!("unknown arch")
+    }
     if os == "windows" {
-        if arch == "x86_64" {
-            if env == "msvc" {
-                build.flag("/arch:AVX2");
-            } else if env == "gnu" {
-                build.flag("-march=x86-64-v3");
-            } else {
-                panic!("unknown env")
-            }
-        } else if arch == "aarch64" {
-            if env == "msvc" {
-                build.flag("/arch:armv8.2");
-                simd_build.flag("/arch:armv8.2");
-            } else if env == "gnu" {
-                build.flag("-march=armv8.2-a");
-                simd_build.flag("-march=armv8.2-a");
-            } else {
-                panic!("unknown env")
-            }
-        } else {
-            panic!("unknown arch")
-        }
         build.flag("-DVK_USE_PLATFORM_WIN32_KHR");
 
         winresource::WindowsResource::new()
             .set_icon("data/icon.ico")
             .compile()
             .unwrap();
-    } else if os == "linux" || os == "macos" {
-        if arch == "x86_64" {
-            build.flag("-march=x86-64-v3");
-        } else if arch == "aarch64" {
-            build.flag("-march=armv8.2-a");
-            simd_build.flag("-march=armv8.2-a");
-        } else {
-            panic!("unknown arch")
-        }
-    } else {
-        panic!("unknown OS")
     }
 
     build.compile("parallel-rdp");