diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 00000000000..db1fbd6f64f
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,39 @@
+#cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.1.0 FATAL_ERROR)
+
+project(Caffe2 CXX)
+
+# TODO(bwasti): versioning
+
+# Useful functions.
+function (exclude OUTPUT INPUT)
+set(EXCLUDES ${ARGN})
+foreach(EXCLUDE ${EXCLUDES})
+        list(REMOVE_ITEM INPUT "${EXCLUDE}")
+endforeach()
+set(${OUTPUT} ${INPUT} PARENT_SCOPE)
+endfunction(exclude)
+
+function (prepend OUTPUT PREPEND)
+set(OUT "")
+foreach(ITEM ${ARGN})
+        list(APPEND OUT "${PREPEND}${ITEM}")
+endforeach()
+set(${OUTPUT} ${OUT} PARENT_SCOPE)
+endfunction(prepend)
+
+# Third party builds.
+include_directories(${CMAKE_SOURCE_DIR})
+file(GLOB Caffe2_THIRD_PARTY "${CMAKE_SOURCE_DIR}/third_party/*")
+include_directories(${Caffe2_THIRD_PARTY})
+
+# googletest.
+add_subdirectory("${CMAKE_SOURCE_DIR}/third_party/googletest")
+include_directories("${CMAKE_SOURCE_DIR}/third_party/googletest/googletest/include")
+
+# Old caffe protobuf.
+add_subdirectory(caffe/proto)
+
+add_subdirectory(caffe2)
+target_link_libraries(Caffe2_CPU)
+target_compile_features(Caffe2_CPU PRIVATE cxx_range_for)
diff --git a/README.md b/README.md
index e2d4edc0ae9..a21cc371d03 100644
--- a/README.md
+++ b/README.md
@@ -8,3 +8,10 @@ Read [the installation instructions](https://github.com/Yangqing/caffe2/blob/mas
 
 Caffe2 is released under the [BSD 2-Clause license](https://github.com/Yangqing/caffe2/blob/master/LICENSE).
 
+### Building Caffe2
+
+    git clone https://github.com/caffe2/caffe2
+    cd caffe2 && mkdir bin
+    cd bin && cmake ..
+    make
+
diff --git a/caffe2/CMakeLists.txt b/caffe2/CMakeLists.txt
new file mode 100644
index 00000000000..59e95821ba9
--- /dev/null
+++ b/caffe2/CMakeLists.txt
@@ -0,0 +1,87 @@
+# Excludes
+set(Caffe2_DIR_EXCLUDES
+        "/binaries"
+        "/contrib"
+        "/distributed"
+        "/mpi"
+        "/image"
+        "/experiments"
+        "/python"
+)
+set(Caffe2_FILE_EXCLUDES
+        "/core/init_omp.cc"
+        "/operators/fully_connected_op_sparse.cc"
+        "/test/caffe2_gtest_main.cc"
+        "/core/init_omp.cc"
+        "/db/db_test.cc"
+        "/db/leveldb.cc"
+        "/db/lmdb.cc"
+        "/db/rocksdb.cc"
+        "/db/zmqdb.cc"
+)
+
+set(Caffe2_CPU_FILE_EXCLUDES
+        "/contrib/nervana/nervana_fc_op_gpu_test.cc"
+        "/core/blob_gpu_test.cc"
+        "/core/context_gpu_test.cc"
+        "/mpi/mpi_gpu_test.cc"
+        "/operators/conv_op_cache_cudnn_test.cc"
+        "/operators/elementwise_op_gpu_test.cc"
+        "/operators/fully_connected_op_gpu_test.cc"
+        "/operators/operator_fallback_gpu_test.cc"
+        "/operators/utility_ops_gpu_test.cc"
+)
+
+# Expand all the exludes.
+prepend(Caffe2_DIR_EXCLUDES ${CMAKE_CURRENT_SOURCE_DIR} ${Caffe2_DIR_EXCLUDES})
+prepend(Caffe2_FILE_EXCLUDES ${CMAKE_CURRENT_SOURCE_DIR} ${Caffe2_FILE_EXCLUDES})
+prepend(Caffe2_CPU_FILE_EXCLUDES ${CMAKE_CURRENT_SOURCE_DIR} ${Caffe2_CPU_FILE_EXCLUDES})
+
+# Get all source directories.
+# TODO(bwasti): GLOB is not considered best practice.
+file(GLOB Caffe2_DIRS ${CMAKE_CURRENT_SOURCE_DIR}/*)
+
+# Exclude all excluded directories.
+exclude(Caffe2_DIRS "${Caffe2_DIRS}" ${Caffe2_DIR_EXCLUDES})
+
+# Get all source files from remaining directories.
+
+# GPU files
+foreach(dir ${Caffe2_DIRS})
+        file(GLOB tmp ${dir}/*_cudnn.cc)
+        set(Caffe2_GPU_SRCS ${Caffe2_GPU_SRCS} ${tmp})
+endforeach()
+foreach(dir ${Caffe2_DIRS})
+        file(GLOB tmp ${dir}/*_gpu.cc)
+        set(Caffe2_GPU_SRCS ${Caffe2_GPU_SRCS} ${tmp})
+endforeach()
+exclude(Caffe2_GPU_SRCS "${Caffe2_GPU_SRCS}" ${Caffe2_FILE_EXCLUDES})
+
+# CPU files.
+foreach(dir ${Caffe2_DIRS})
+        file(GLOB tmp ${dir}/*.cc)
+        set(Caffe2_CPU_SRCS ${Caffe2_CPU_SRCS} ${tmp})
+endforeach()
+exclude(Caffe2_CPU_SRCS "${Caffe2_CPU_SRCS}" ${Caffe2_FILE_EXCLUDES})
+exclude(Caffe2_CPU_SRCS "${Caffe2_CPU_SRCS}" ${Caffe2_CPU_FILE_EXCLUDES})
+exclude(Caffe2_CPU_SRCS "${Caffe2_CPU_SRCS}" ${Caffe2_GPU_SRCS})
+
+# CPU test files.
+set(Caffe2_CPU_TEST_SRCS
+        "/test/caffe2_gtest_main.cc"
+)
+prepend(Caffe2_CPU_TEST_SRCS ${CMAKE_CURRENT_SOURCE_DIR} ${Caffe2_CPU_TEST_SRCS})
+
+# Compile protobufs.
+add_subdirectory(proto)
+include_directories(BEFORE ${CMAKE_BINARY_DIR})
+
+# Compile exposed libraries.
+add_library(Caffe2_CPU ${Caffe2_CPU_SRCS})
+target_link_libraries(Caffe2_CPU Caffe2_PROTO)
+
+# Compile test binaries.
+add_executable(Caffe2_CPU_TEST ${Caffe2_CPU_TEST_SRCS})
+
+target_link_libraries(Caffe2_CPU_TEST Caffe2_CPU gtest)
+target_compile_features(Caffe2_CPU_TEST PRIVATE cxx_range_for)
diff --git a/caffe2/proto/CMakeLists.txt b/caffe2/proto/CMakeLists.txt
new file mode 100644
index 00000000000..926f5107e8b
--- /dev/null
+++ b/caffe2/proto/CMakeLists.txt
@@ -0,0 +1,8 @@
+find_package(Protobuf REQUIRED)
+
+file(GLOB Caffe2_PROTOBUF_FILES "${CMAKE_CURRENT_SOURCE_DIR}/*.proto")
+
+PROTOBUF_GENERATE_CPP(Caffe2_PROTO_SRCS Caffe2_PROTO_HEADERS ${Caffe2_PROTOBUF_FILES})
+
+add_library(Caffe2_PROTO ${Caffe2_PROTO_HEADERS} ${Caffe2_PROTO_SRCS})
+target_include_directories(Caffe2_PROTO PUBLIC ${CMAKE_CURRENT_BINARY_DIR})