diff --git a/.github/workflows/build_and_test.yml b/.github/workflows/build_and_test.yml
new file mode 100644
index 0000000..e56f287
--- /dev/null
+++ b/.github/workflows/build_and_test.yml
@@ -0,0 +1,146 @@
+
+name: "Build & Test"
+
+on:
+  # allow direct trigger
+  workflow_dispatch:
+  push:
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+env:
+  GCC_VERSION: "12"
+  LLVM_VERSION: "18"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4.1.1
+        with:
+          persist-credentials: false
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update -y -qq
+          sudo apt-get install -y -qq build-essential curl ninja-build debootstrap
+
+      # Needed for some target toolchains like ld
+      - name: Install gcc
+        run: |
+          sudo apt-get install -y -qq gcc-${GCC_VERSION} gcc-${GCC_VERSION}-riscv64-linux-gnu g++-${GCC_VERSION} g++-${GCC_VERSION}-riscv64-linux-gnu
+
+      - name: Install llvm
+        run: |
+          curl -o llvm.sh https://apt.llvm.org/llvm.sh
+          chmod u+x llvm.sh
+          sudo ./llvm.sh ${LLVM_VERSION}
+          sudo ln -srf $(which clang-${LLVM_VERSION}) /usr/bin/clang
+          rm llvm.sh
+
+      - name: Setup QEMU
+        uses: docker/setup-qemu-action@v3.0.0
+
+      - name: Check sysroot cache
+        id: check-sysroot-cache
+        uses: actions/cache@v3
+        with:
+          path: sysroot
+          key: sysroot-${{ hashFiles('./.github/workflows/build_and_test.yml') }}
+
+      - name: Create sysroot
+        run: |
+          sudo debootstrap --arch=riscv64 --verbose --include=fakeroot,symlinks --resolve-deps --variant=minbase --components=main,universe focal sysroot
+          # Remove unused files to minimize cache
+          sudo chroot sysroot symlinks -cr .
+          sudo chown ${USER} -R sysroot
+          rm -rf sysroot/{dev,proc,run,sys,var}
+          rm -rf sysroot/usr/{sbin,bin,share}
+          rm -rf sysroot/usr/lib/{apt,gcc,udev,systemd}
+          rm -rf sysroot/usr/libexec/gcc
+        if: steps.check-sysroot-cache.outputs.cache-hit != 'true'
+
+      - name: Build
+        shell: bash -ex -o pipefail {0}
+        run: |
+          cmake -S . -B build -GNinja \
+            -DCMAKE_INSTALL_PREFIX="$(pwd)/install" \
+            -DCMAKE_TOOLCHAIN_FILE=$(pwd)/CMakeToolchain/riscv.clang.cross.cmake \
+            -DCMAKE_SYSROOT=$(pwd)/sysroot
+          cmake --build build
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: build
+          path: |
+            build
+        if: always()
+
+  test:
+    runs-on: ubuntu-latest
+    needs: [build]
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=128,elen=64,vext_spec=v1.0"
+          - qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=256,elen=64,vext_spec=v1.0"
+          - qemu_cpu: "rv64,zba=true,zbb=true,zbs=true,v=true,vlen=512,elen=64,vext_spec=v1.0"
+
+    name: "test (qemu_cpu: \"${{ matrix.qemu_cpu }}\")"
+    steps:
+      - uses: actions/checkout@v4.1.1
+        with:
+          persist-credentials: false
+
+      - name: Setup QEMU
+        uses: docker/setup-qemu-action@v3.0.0
+
+      - name: Check sysroot cache
+        id: check-sysroot-cache
+        uses: actions/cache@v3
+        with:
+          path: sysroot
+          key: sysroot-${{ hashFiles('./.github/workflows/build_and_test.yml') }}
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update -y -qq
+          sudo apt-get install -y -qq libgmp-dev libmpfr-dev
+
+      - name: Download build artifacts
+        uses: actions/download-artifact@v3
+        with:
+          name: build
+
+      - name: Fix build permissions
+        run: |
+          find .
+          chmod +x build/test/test_*
+
+      - name: Test
+        env:
+          CTEST_OUTPUT_ON_FAILURE: "TRUE"
+        run: |
+          if [[ -n "${{ matrix.qemu_cpu }}" ]]; then
+            export QEMU_CPU="${{ matrix.qemu_cpu }}"
+          fi
+          export QEMU_LD_PREFIX=$(pwd)/sysroot
+          cd build
+          ctest -j$(nproc)
+
+      - name: Upload test-${{ strategy.job-index }} artifacts
+        uses: actions/upload-artifact@v3
+        with:
+          name: test-${{ strategy.job-index }}
+          path: |
+            build/Testing
+        if: always()
diff --git a/.gitignore b/.gitignore
index 196f2fd..e31193c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,7 +2,8 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-build*
+build/
+install/
+sysroot/
 compile_commands.json
 LOCAL
-.*
diff --git a/CMakeToolchain/riscv.clang.cross.cmake b/CMakeToolchain/riscv.clang.cross.cmake
index a32404f..686a175 100644
--- a/CMakeToolchain/riscv.clang.cross.cmake
+++ b/CMakeToolchain/riscv.clang.cross.cmake
@@ -2,39 +2,20 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-if (RISCV_TOOLCHAIN_INCLUDED)
-    return()
-endif()
-set(RISCV_TOOLCHAIN_INCLUDED)
+SET (CMAKE_CROSSCOMPILING   TRUE)
+SET (CMAKE_SYSTEM_NAME      "Linux")
+SET (CMAKE_SYSTEM_PROCESSOR "riscv64")
 
-set(CMAKE_SYSTEM_NAME Linux)
-set(CMAKE_SYSTEM_PROCESSOR riscv)
+SET(CMAKE_FIND_ROOT_PATH  /usr/riscv64-linux-gnu /usr/include/riscv64-linux-gnu /usr/lib/riscv64-linux-gnu /lib/riscv64-linux-gnu)
 
-set(CMAKE_C_COMPILER clang)
-set(CMAKE_C_COMPILER_TARGET riscv64-unknown-linux-gnu)
-set(CMAKE_CXX_COMPILER clang++)
-set(CMAKE_CXX_COMPILER_TARGET riscv64-unknown-linux-gnu)
+find_program(CMAKE_C_COMPILER NAMES clang-18 clang)
+set(CMAKE_C_COMPILER_TARGET riscv64-linux-gnu)
+set(CMAKE_C_FLAGS "-march=rv64gcv_zba_zbb_zbs")
 
-set(RISCV_TOOL_BASE /opt/riscv)
-set(SYSROOT_PATH ${RISCV_TOOL_BASE}/sysroot)
+find_program(CMAKE_CXX_COMPILER NAMES clang++-18 clang++)
+set(CMAKE_CXX_COMPILER_TARGET riscv64-linux-gnu)
+set(CMAKE_CXX_FLAGS "-march=rv64gcv_zba_zbb_zbs")
 
-set(CMAKE_FIND_ROOT_PATH ${SYSROOT_PATH})
-set(CMAKE_SYSROOT ${SYSROOT_PATH})
-
-# Find includes and libraries in the target environment
-set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
-set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
-
-# General options to enable cross-compilation
-set(MARCH_OR_CPU -march=rv64gcv)
-set(GCC_TOOLCHAIN --gcc-toolchain=${RISCV_TOOL_BASE})
-set(ISYSTEM -isystem${RISCV_TOOL_BASE}/${CMAKE_C_COMPILER_TARGET}/include/c++/12.1.0/riscv64-unknown-linux-gnu -isystem${RISCV_TOOL_BASE}/${CMAKE_C_COMPILER_TARGET}/include/c++/12.1.0)
-
-add_compile_options(
-    ${MARCH_OR_CPU} ${GCC_TOOLCHAIN} ${ISYSTEM}
-)
-
-add_link_options(
-    ${MARCH_OR_CPU}
-    ${GCC_TOOLCHAIN}
-)
+SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+SET(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY BOTH)
+SET(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
diff --git a/include/rvvlm_erfD.inc.h b/include/rvvlm_erfD.inc.h
index f79b692..0f2190b 100644
--- a/include/rvvlm_erfD.inc.h
+++ b/include/rvvlm_erfD.inc.h
@@ -8,8 +8,6 @@
 #define F_VER1 RVVLM_ERFDI_STD
 #endif
 
-#include <fenv.h>
-
 // T is 2.0
 #define T 0x1.0p+1
 
diff --git a/include/rvvlm_erfcD.inc.h b/include/rvvlm_erfcD.inc.h
index 253de74..fb1414b 100644
--- a/include/rvvlm_erfcD.inc.h
+++ b/include/rvvlm_erfcD.inc.h
@@ -19,8 +19,6 @@ static_assert(false,
               "Must compile for ERFC or CDFNORM when including " __FILE__);
 #endif
 
-#include <fenv.h>
-
 #if defined(COMPILE_FOR_ERFC)
 // polynomial coefficients Q62
 #define P_0 0x4f33682d757709e8