diff --git a/cmake/external/gflags.cmake b/cmake/external/gflags.cmake
index 2a49d76eb30f592a28746f5897b14b7dd319d784..b36e217999e7d54217d5d6ca02d28c8050b648fa 100644
--- a/cmake/external/gflags.cmake
+++ b/cmake/external/gflags.cmake
@@ -31,6 +31,10 @@ ExternalProject_Add(
     GIT_REPOSITORY  "https://github.com/gflags/gflags.git"
     PREFIX          ${GFLAGS_SOURCES_DIR}
     UPDATE_COMMAND  ""
+    CMAKE_ARGS      -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+    CMAKE_ARGS      -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+    CMAKE_ARGS      -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
+    CMAKE_ARGS      -DCMAKE_C_FLAGS=${CMAKE_C_FLAGS}
     CMAKE_ARGS      -DCMAKE_INSTALL_PREFIX=${GFLAGS_INSTALL_DIR}
     CMAKE_ARGS      -DCMAKE_POSITION_INDEPENDENT_CODE=ON
     CMAKE_ARGS      -DBUILD_TESTING=OFF
diff --git a/cmake/external/glog.cmake b/cmake/external/glog.cmake
index ab105611c812a4f4b642ac5b1213fdfe93fab97d..11be58e27ed6b86164f07ac0a4d0dc5f9422d2d7 100644
--- a/cmake/external/glog.cmake
+++ b/cmake/external/glog.cmake
@@ -33,6 +33,10 @@ ExternalProject_Add(
     GIT_REPOSITORY  "https://github.com/google/glog.git"
     PREFIX          ${GLOG_SOURCES_DIR}
     UPDATE_COMMAND  ""
+    CMAKE_ARGS      -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+    CMAKE_ARGS      -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+    CMAKE_ARGS      -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
+    CMAKE_ARGS      -DCMAKE_C_FLAGS=${CMAKE_C_FLAGS}
     CMAKE_ARGS      -DCMAKE_INSTALL_PREFIX=${GLOG_INSTALL_DIR}
     CMAKE_ARGS      -DCMAKE_POSITION_INDEPENDENT_CODE=ON
     CMAKE_ARGS      -DWITH_GFLAGS=ON
diff --git a/cmake/external/gtest.cmake b/cmake/external/gtest.cmake
index 11d829a9e2f239848803130505c9862695b25029..25fa98ee5f3d7d2adc99852b4226f291c1825856 100644
--- a/cmake/external/gtest.cmake
+++ b/cmake/external/gtest.cmake
@@ -41,6 +41,10 @@ IF(WITH_TESTING)
         GIT_TAG         "release-1.8.0"
         PREFIX          ${GTEST_SOURCES_DIR}
         UPDATE_COMMAND  ""
+        CMAKE_ARGS      -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+        CMAKE_ARGS      -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+        CMAKE_ARGS      -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
+        CMAKE_ARGS      -DCMAKE_C_FLAGS=${CMAKE_C_FLAGS}
         CMAKE_ARGS      -DCMAKE_INSTALL_PREFIX:PATH=${GTEST_INSTALL_DIR}
         CMAKE_ARGS      -DCMAKE_POSITION_INDEPENDENT_CODE=ON
         CMAKE_ARGS      -DBUILD_GMOCK=ON
diff --git a/cmake/external/warpctc.cmake b/cmake/external/warpctc.cmake
index 172c318b35d611d0432b78f2a18eb58a7d272b90..e9a1eac01a7702197560e21282b9d75b0375e1d3 100644
--- a/cmake/external/warpctc.cmake
+++ b/cmake/external/warpctc.cmake
@@ -50,6 +50,8 @@ ExternalProject_Add(
     UPDATE_COMMAND  ""
     CMAKE_ARGS      -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
     CMAKE_ARGS      -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+    CMAKE_ARGS      -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
+    CMAKE_ARGS      -DCMAKE_C_FLAGS=${CMAKE_C_FLAGS}
     CMAKE_ARGS      -DCMAKE_INSTALL_PREFIX=${WARPCTC_INSTALL_DIR}
     CMAKE_ARGS      -DWITH_GPU=${WITH_GPU}
     CMAKE_ARGS      -DWITH_OMP=${USE_OMP}
diff --git a/cmake/external/zlib.cmake b/cmake/external/zlib.cmake
index f456b79b7386f5de2abb368b0724b9cabd183e3e..4331e1f31a145a66121bf2c55bbc88ac80d3997f 100644
--- a/cmake/external/zlib.cmake
+++ b/cmake/external/zlib.cmake
@@ -34,6 +34,10 @@ ExternalProject_Add(
     GIT_TAG         "v1.2.8"
     PREFIX          ${ZLIB_SOURCES_DIR}
     UPDATE_COMMAND  ""
+    CMAKE_ARGS      -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
+    CMAKE_ARGS      -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
+    CMAKE_ARGS      -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS}
+    CMAKE_ARGS      -DCMAKE_C_FLAGS=${CMAKE_C_FLAGS}
     CMAKE_ARGS      -DCMAKE_INSTALL_PREFIX=${ZLIB_INSTALL_DIR}
     CMAKE_ARGS      -DBUILD_SHARED_LIBS=OFF
     CMAKE_ARGS      -DCMAKE_POSITION_INDEPENDENT_CODE=ON