diff --git a/.gitignore b/.gitignore
index 97811b6a..635a0249 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,3 +22,6 @@ silverfish.iml
 .vagrant
 Vagrantfile
 *-cloudimg-console.log
+
+wasi-sdk
+.vscode
diff --git a/code_benches/run.py b/code_benches/run.py
index a0bdc07b..1b9e3044 100755
--- a/code_benches/run.py
+++ b/code_benches/run.py
@@ -91,9 +91,16 @@ def getmtime_or_zero(x):
 WASI_SDK_SYSROOT = WASI_SDK_PATH + "/share/wasi-sysroot"
 WASI_SDK_FLAGS = "--target=wasm32-wasi -mcpu=mvp -nostartfiles -O3 -flto"
 WASI_SDK_BACKING = "wasi_sdk_backing.c"
-WASI_SDK_URL = "https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-8/wasi-sdk-8.0-linux.tar.gz"
 
 # download WASI-SDK if it is not in the expected path
+if sys.platform == "linux" or sys.platform == "linux2":
+    WASI_SDK_URL = "https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-8/wasi-sdk-8.0-linux.tar.gz"
+elif sys.platform == "darwin":
+    WASI_SDK_URL = "https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-8/wasi-sdk-8.0-macos.tar.gz"
+else:
+    print("awsm supports Linux and Mac OS, saw {}".format(sys.platform))
+    exit(1)
+
 if args.wasi_sdk:
     if not os.path.exists(WASI_SDK_PATH):
         cwd = os.path.dirname(WASI_SDK_PATH)
diff --git a/install_mac.sh b/install_mac.sh
new file mode 100755
index 00000000..1a242de6
--- /dev/null
+++ b/install_mac.sh
@@ -0,0 +1,35 @@
+#!/bin/zsh
+git submodule update --init --recursive
+
+# Install brew
+if [[ -x "$(command -v brew)" ]]; then
+  echo "Brew install detected"
+else
+  curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh | bash -s -- -y
+fi
+
+# Install required tools
+brew install svn
+brew install wget
+brew install cmake
+
+# Install LLVM and clang stuff
+xcode-select install
+if [[ -x "$(command -v rustup)" ]]; then
+  echo "LLVM detected"
+else
+  brew install llvm
+  echo 'export PATH="/usr/local/opt/llvm/bin:$PATH"' >>~/.zshrc
+fi
+
+# Install Rust
+if [[ -x "$(command -v rustup)" ]]; then
+  rustup update
+else
+  curl https://sh.rustup.rs -sSf | bash -s -- -y
+fi
+source "$HOME/.cargo/env"
+export PATH="$HOME/.cargo/bin:$PATH"
+
+# Build project
+cargo build --release
diff --git a/runtime/libc/env.c b/runtime/libc/env.c
index a55d6172..51719865 100644
--- a/runtime/libc/env.c
+++ b/runtime/libc/env.c
@@ -145,15 +145,3 @@ env_getcycles(void)
 
     #endif
 }
-
-// Floating point routines
-// TODO: Do a fair comparison between musl and wasm-musl
-INLINE double
-env_sin(double d) {
-    return sin(d);
-}
-
-INLINE double
-env_cos(double d) {
-    return cos(d);
-}
diff --git a/runtime/libc/wasi_sdk_backing.c b/runtime/libc/wasi_sdk_backing.c
index 7a5b3576..a7f34df3 100644
--- a/runtime/libc/wasi_sdk_backing.c
+++ b/runtime/libc/wasi_sdk_backing.c
@@ -17,6 +17,16 @@
 
 #include "../runtime.h"
 
+/* POSIX compatibility shims */
+#ifndef O_RSYNC
+#define O_RSYNC O_SYNC
+#endif
+
+#ifdef __APPLE__
+#undef fdatasync
+#define fdatasync fsync
+#endif
+
 int main(int argc, char* argv[]) {
     runtime_main(argc, argv);
     printf("mem use = %d\n", (int) memory_size);
@@ -276,7 +286,13 @@ static i32 wasi_fromerrno(int errno_) {
         case ETIMEDOUT:         return WASI_ETIMEDOUT;
         case ETXTBSY:           return WASI_ETXTBSY;
         case EXDEV:             return WASI_EXDEV;
+        default:
+            fprintf(stderr, "wasi_fromerrno unexpectedly received: %s\n", strerror(errno_));
+            fflush(stderr);
     }
+
+    silverfish_assert(0);
+    return 0;
 }
 
 // file operations
diff --git a/runtime/libc/wasmception_backing.c b/runtime/libc/wasmception_backing.c
index 20df928e..59dfd8c6 100644
--- a/runtime/libc/wasmception_backing.c
+++ b/runtime/libc/wasmception_backing.c
@@ -627,3 +627,15 @@ void env___unmapself(u32 base, u32 size) {
     // Just do some no op
 }
 
+// Floating point routines
+// TODO: Do a fair comparison between musl and wasm-musl
+INLINE double
+env_sin(double d) {
+    return sin(d);
+}
+
+INLINE double
+env_cos(double d) {
+    return cos(d);
+}
+
diff --git a/runtime/runtime.c b/runtime/runtime.c
index 30a843d5..44c9cfc9 100644
--- a/runtime/runtime.c
+++ b/runtime/runtime.c
@@ -207,22 +207,7 @@ INLINE double f64_copysign(double a, double b) {
     return copysign(a, b);
 }
 
-// Memory related instructions
-i32 instruction_memory_size() {
-    return memory_size / WASM_PAGE_SIZE;
-}
-
-i32 instruction_memory_grow(i32 count) {
-    i32 prev_size = instruction_memory_size();
-    for (int i = 0; i < count; i++) {
-        expand_memory();
-    }
-
-    return prev_size;
-}
-
-
-// We want to have some allocation logic
+// We want to have some allocation logic here, so we can use it to implement libc
 WEAK u32 wasmg___heap_base = 0;
 u32 runtime_heap_base;
 
diff --git a/runtime/runtime.h b/runtime/runtime.h
index 1cbb621d..d5c03e15 100644
--- a/runtime/runtime.h
+++ b/runtime/runtime.h
@@ -113,6 +113,9 @@ INLINE double get_f64(u32 offset);
 INLINE void set_f32(u32 offset, float);
 INLINE void set_f64(u32 offset, double);
 
+i32 instruction_memory_size();
+i32 instruction_memory_grow();
+
 static inline void* get_memory_ptr_void(u32 offset, u32 bounds_check) {
     return (void*) get_memory_ptr_for_runtime(offset, bounds_check);
 }