diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..594bce2
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,26 @@
+language: cpp
+sudo: false
+dist: trusty
+
+matrix:
+  include:
+    - env: CXX_COMPILER=g++-6
+      addons:
+        apt:
+          sources:
+          - ubuntu-toolchain-r-test
+          packages:
+          - gcc-6
+          - g++-6
+    - env: CXX_COMPILER=clang++-3.9
+      addons:
+        apt:
+          sources:
+          - llvm-toolchain-precise-3.9
+          - ubuntu-toolchain-r-test
+          packages:
+          - clang-3.9
+
+script:
+  - export CXX="${CXX_COMPILER}"
+  - ./make.sh
diff --git a/Util.hpp b/Util.hpp
index 954404c..79044c2 100644
--- a/Util.hpp
+++ b/Util.hpp
@@ -39,20 +39,31 @@
 
 #define OVERRIDE
 
-#ifdef WIN32
-#define ALWAYS_INLINE __forceinline
-#define NO_INLINE __declspec(noinline)
+#if defined(__GNUC__) && (__GNUC__ >= 4)
+#define ALWAYS_INLINE __attribute__((__always_inline__))
+#define NO_INLINE __attribute__((__noinline__))
+#elif defined(_MSC_VER) && (_MSC_VER >= 1200)
+#  define ALWAYS_INLINE __forceinline
+#  if _MSC_VER >= 1310
+#    define NO_INLINE __declspec(noinline)
+#  else
+#    define NO_INLINE
+#  endif
 #else
-#define ALWAYS_INLINE __attribute__((always_inline))
-#define NO_INLINE __declspec(noinline)
+#  define ALWAYS_INLINE
+#  define NO_INLINE
 #endif
 
 #define no_alias __restrict
 #define rst // no_alias
 
-// TODO: Implement these.
-#define LIKELY(x) x
-#define UNLIKELY(x) x
+#if defined(__GNUC__) && (__GNUC__ >= 3)
+#define LIKELY(x) __builtin_expect(!!(x), 1)
+#define UNLIKELY(x) __builtin_expect(!!(x), 0)
+#else
+#define LIKELY(x) !!(x)
+#define UNLIKELY(x) !!(x)
+#endif
 
 #ifdef _DEBUG
 static const bool kIsDebugBuild = true;
@@ -60,10 +71,16 @@ static const bool kIsDebugBuild = true;
 static const bool kIsDebugBuild = false;
 #endif
 
-#ifdef _MSC_VER
-#define ASSUME(x) __assume(x)
+#if defined(_MSC_VER) && (_MSC_VER >= 1310)
+#  define ASSUME(x) __assume(x)
+#elif defined(__has_builtin)
+#  if __has_builtin(__builtin_assume)
+#    define ASSUME(x) __builtin_assume(x)
+#  else
+#    define ASSUME(x)
+#  endif
 #else
-#define ASSUME(x)
+#  define ASSUME(x)
 #endif
 
 typedef uint32_t hash_t;
diff --git a/make.sh b/make.sh
index cb4f330..585513a 100755
--- a/make.sh
+++ b/make.sh
@@ -1 +1,7 @@
-g++ -DNDEBUG -O3 -fomit-frame-pointer -msse2 -std=c++11 -D_FILE_OFFSET_BITS=64 -o mcm Archive.cpp Huffman.cpp MCM.cpp Memory.cpp Util.cpp Compressor.cpp File.cpp LZ.cpp Tests.cpp -lpthread
+#!/bin/sh
+
+if [ ! -n "${CXX}" ]; then
+    CXX=c++
+fi
+
+${CXX} -DNDEBUG -O3 -fomit-frame-pointer -msse2 -std=c++11 -D_FILE_OFFSET_BITS=64 -o mcm Archive.cpp Huffman.cpp MCM.cpp Memory.cpp Util.cpp Compressor.cpp File.cpp LZ.cpp Tests.cpp -lpthread