diff --git a/toolchain-c/cmake/toolchain-riscv64.cmake b/toolchain-c/cmake/toolchain-riscv64.cmake
new file mode 100644
index 00000000..6d6a0025
--- /dev/null
+++ b/toolchain-c/cmake/toolchain-riscv64.cmake
@@ -0,0 +1,22 @@
+if (NOT DEFINED ENV{CROSS_TOOLCHAIN_PREFIX})
+    message(FATAL_ERROR "CROSS_TOOLCHAIN_PREFIX=... must be specified.")
+endif()
+
+set(CROSS_TOOLCHAIN_PREFIX "$ENV{CROSS_TOOLCHAIN_PREFIX}")
+
+set(CMAKE_SYSTEM_NAME yggdrasil)
+set(CMAKE_C_COMPILER "${CROSS_TOOLCHAIN_PREFIX}/bin/clang")
+set(CMAKE_CXX_COMPILER "${CROSS_TOOLCHAIN_PREFIX}/bin/clang++")
+
+# Specify the target triple for your custom OS.
+set(CMAKE_C_COMPILER_TARGET "riscv64-unknown-yggdrasil")
+set(CMAKE_ASM_COMPILER_TARGET "riscv64-unknown-yggdrasil")
+
+# Disable default system libraries
+# set(CMAKE_EXE_LINKER_FLAGS "-nostdlib")
+# set(CMAKE_SHARED_LINKER_FLAGS "-v")
+
+set(CMAKE_C_FLAGS "--target=riscv64-unknown-yggdrasil -fPIC")
+set(CMAKE_CXX_FLAGS "--target=riscv64-unknown-yggdrasil -march=rv64gc -nostdlib++ -fPIC -D_LIBCPP_HAS_NO_TREE_BARRIER")
+
+# Specify any additional include paths or linker flags as needed