diff --git a/cmake/external/numpy.cmake b/cmake/external/numpy.cmake
index 607ff317899aaa6178b616311840fa08b08df950..9d686ecaac9818be34915da783dd73d927d45542 100644
--- a/cmake/external/numpy.cmake
+++ b/cmake/external/numpy.cmake
@@ -70,6 +70,7 @@ IF(NOT ${NUMPY_FOUND})
     FIND_PATH(PYTHON_NUMPY_INCLUDE_DIR numpy/arrayobject.h
         HINTS "${NUMPY_PATH}" "${PYTHON_INCLUDE_PATH}")
 
-    INCLUDE_DIRECTORIES(${PYTHON_NUMPY_INCLUDE_DIR})
-
 ENDIF()
+
+INCLUDE_DIRECTORIES(${PYTHON_NUMPY_INCLUDE_DIR})
+
diff --git a/cmake/external/protobuf.cmake b/cmake/external/protobuf.cmake
index 8acc6325b9e554bbada378bea56cbaa2bafee413..0138f082d942c4917aaeeafe0650c18c84e2e099 100644
--- a/cmake/external/protobuf.cmake
+++ b/cmake/external/protobuf.cmake
@@ -22,7 +22,7 @@ ExternalProject_Add(
     PREFIX          ${PROTOBUF_SOURCES_DIR}
     DEPENDS         zlib
     GIT_REPOSITORY  "https://github.com/google/protobuf.git"
-    GIT_TAG         "v3.0.0"
+#   GIT_TAG         "v3.1.0"
     CONFIGURE_COMMAND
         ${CMAKE_COMMAND} ${PROTOBUF_SOURCES_DIR}/src/protobuf/cmake
         -Dprotobuf_BUILD_TESTS=OFF
diff --git a/cmake/external/python.cmake b/cmake/external/python.cmake
index 2354f555db89d970be740cfcff06eadd3918c3b0..7b66cb44e4f9f804a244fe7c3f685557fca66845 100644
--- a/cmake/external/python.cmake
+++ b/cmake/external/python.cmake
@@ -19,8 +19,8 @@ IF((NOT ${PYTHONINTERP_FOUND}) OR (NOT ${PYTHONLIBS_FOUND}))
 
   INCLUDE(ExternalProject)
 
-  SET(PYTHON_SOURCES_DIR ${CMAKE_CURRENT_SOURCE_DIR}/third_party/python)
-  SET(PYTHON_INSTALL_DIR ${PROJECT_BINARY_DIR}/python)
+  SET(PYTHON_SOURCES_DIR ${CMAKE_CURRENT_SOURCE_DIR}/third_party/Python)
+  SET(PYTHON_INSTALL_DIR ${PROJECT_BINARY_DIR}/Python)
 
   IF(MSVC)
     LIST(APPEND EXTERNAL_PROJECT_OPTIONAL_ARGS
@@ -87,6 +87,6 @@ IF((NOT ${PYTHONINTERP_FOUND}) OR (NOT ${PYTHONLIBS_FOUND}))
     MESSAGE(FATAL_ERROR "Unknown system !")
   ENDIF()
 
-INCLUDE_DIRECTORIES(${PYTHON_INCLUDE_DIR})
-
 ENDIF()
+
+INCLUDE_DIRECTORIES(${PYTHON_INCLUDE_DIR})
diff --git a/cmake/external/warpctc.cmake b/cmake/external/warpctc.cmake
index 4fdd47acdb75e535715d20019054873549988203..d59e5e9c3af48c8cce197c287f28abfb1ed7afa7 100644
--- a/cmake/external/warpctc.cmake
+++ b/cmake/external/warpctc.cmake
@@ -17,7 +17,7 @@ INCLUDE(ExternalProject)
 SET(WARPCTC_SOURCES_DIR ${CMAKE_CURRENT_SOURCE_DIR}/third_party/warpctc)
 SET(WARPCTC_INSTALL_DIR ${PROJECT_BINARY_DIR}/warpctc)
 
-IF(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+IF(CMAKE_CXX_COMPILER_ID STREQUAL "Clang" OR CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang" )
     SET(USE_OMP ON)
 ELSE()
     SET(USE_OMP OFF)
@@ -28,8 +28,9 @@ ExternalProject_Add(
     GIT_REPOSITORY  "https://github.com/gangliao/warp-ctc.git"
     PREFIX          ${WARPCTC_SOURCES_DIR}
     CMAKE_ARGS      -DCMAKE_INSTALL_PREFIX=${WARPCTC_INSTALL_DIR}
-    CMAKE_ARGS      -DWITH_GPU=${CUDA_FOUND}
+    CMAKE_ARGS      -DWITH_GPU=${WITH_GPU}
     CMAKE_ARGS      -DWITH_OMP=${USE_OMP}
+    UPDATE_COMMAND ""
 )
 
 SET(WARPCTC_INCLUDE_DIR "${WARP_INSTALL_DIR}/include" CACHE PATH "Warp-ctc Directory" FORCE)
@@ -40,7 +41,7 @@ IF(WIN32)
         "${WARPCTC_INSTALL_DIR}/lib/warpctc.dll" CACHE FILEPATH "Warp-ctc Library" FORCE)
 ELSE(WIN32)
     SET(WARPCTC_LIBRARIES
-        "${WARPCTC_INSTALL_DIR}/lib/libwarpctc.so" CACHE FILEPATH "Warp-ctc Library" FORCE)
+        "${WARPCTC_INSTALL_DIR}/lib/libwarpctc.dylib" CACHE FILEPATH "Warp-ctc Library" FORCE)
 ENDIF(WIN32)
 
 LIST(APPEND external_project_dependencies warpctc)