diff --git a/animation-server/CMakeLists.txt b/animation-server/CMakeLists.txt
index 490e01ffec..80544c103a 100644
--- a/animation-server/CMakeLists.txt
+++ b/animation-server/CMakeLists.txt
@@ -35,7 +35,7 @@ link_hifi_library(networking ${TARGET_NAME} "${ROOT_DIR}")
 find_package(GnuTLS REQUIRED)
 
 # include the GnuTLS dir
-include_directories("${GNUTLS_INCLUDE_DIR}")
+include_directories(SYSTEM "${GNUTLS_INCLUDE_DIR}")
 
 # link GnuTLS
 target_link_libraries(${TARGET_NAME} "${GNUTLS_LIBRARY}")
\ No newline at end of file
diff --git a/assignment-client/CMakeLists.txt b/assignment-client/CMakeLists.txt
index 4930c2ace1..ce2c6b6d4e 100644
--- a/assignment-client/CMakeLists.txt
+++ b/assignment-client/CMakeLists.txt
@@ -35,7 +35,7 @@ link_hifi_library(script-engine ${TARGET_NAME} "${ROOT_DIR}")
 link_hifi_library(embedded-webserver ${TARGET_NAME} "${ROOT_DIR}")
 
 find_package(GnuTLS REQUIRED)
-include_directories("${GNUTLS_INCLUDE_DIR}")
+include_directories(SYSTEM "${GNUTLS_INCLUDE_DIR}")
 
 if (UNIX)
   target_link_libraries(${TARGET_NAME} ${CMAKE_DL_LIBS})
diff --git a/domain-server/CMakeLists.txt b/domain-server/CMakeLists.txt
index c960005995..5388d5d8e0 100644
--- a/domain-server/CMakeLists.txt
+++ b/domain-server/CMakeLists.txt
@@ -39,7 +39,7 @@ link_hifi_library(shared ${TARGET_NAME} "${ROOT_DIR}")
 link_hifi_library(embedded-webserver ${TARGET_NAME} "${ROOT_DIR}")
 
 # include the GnuTLS dir
-include_directories("${GNUTLS_INCLUDE_DIR}")
+include_directories(SYSTEM "${GNUTLS_INCLUDE_DIR}")
 
 IF (WIN32)
   target_link_libraries(${TARGET_NAME} Winmm Ws2_32)
diff --git a/libraries/audio/CMakeLists.txt b/libraries/audio/CMakeLists.txt
index 213e04c43a..e34dfa65f5 100644
--- a/libraries/audio/CMakeLists.txt
+++ b/libraries/audio/CMakeLists.txt
@@ -25,5 +25,5 @@ link_hifi_library(networking ${TARGET_NAME} "${ROOT_DIR}")
 
 # link GnuTLS
 find_package(GnuTLS REQUIRED)
-include_directories("${GNUTLS_INCLUDE_DIR}")
+include_directories(SYSTEM "${GNUTLS_INCLUDE_DIR}")
 target_link_libraries(${TARGET_NAME} "${GNUTLS_LIBRARY}")
\ No newline at end of file
diff --git a/libraries/avatars/CMakeLists.txt b/libraries/avatars/CMakeLists.txt
index fe31eb6a06..c4eff1c45b 100644
--- a/libraries/avatars/CMakeLists.txt
+++ b/libraries/avatars/CMakeLists.txt
@@ -29,5 +29,5 @@ link_hifi_library(voxels ${TARGET_NAME} "${ROOT_DIR}")
 link_hifi_library(networking ${TARGET_NAME} "${ROOT_DIR}")
 
 find_package(GnuTLS REQUIRED)
-include_directories("${GNUTLS_INCLUDE_DIR}")
+include_directories(SYSTEM "${GNUTLS_INCLUDE_DIR}")
 target_link_libraries(${TARGET_NAME} Qt5::Script "${GNUTLS_LIBRARY}")
\ No newline at end of file
diff --git a/libraries/metavoxels/CMakeLists.txt b/libraries/metavoxels/CMakeLists.txt
index 4ef9fcc9cb..220cca1f11 100644
--- a/libraries/metavoxels/CMakeLists.txt
+++ b/libraries/metavoxels/CMakeLists.txt
@@ -28,5 +28,5 @@ include(${MACRO_DIR}/IncludeGLM.cmake)
 include_glm(${TARGET_NAME} "${ROOT_DIR}")
 
 find_package(GnuTLS REQUIRED)
-include_directories("${GNUTLS_INCLUDE_DIR}")
+include_directories(SYSTEM "${GNUTLS_INCLUDE_DIR}")
 target_link_libraries(${TARGET_NAME} Qt5::Network Qt5::Widgets Qt5::Script "${GNUTLS_LIBRARY}")
\ No newline at end of file
diff --git a/libraries/networking/CMakeLists.txt b/libraries/networking/CMakeLists.txt
index 101e739fea..56e937e0d7 100644
--- a/libraries/networking/CMakeLists.txt
+++ b/libraries/networking/CMakeLists.txt
@@ -20,5 +20,5 @@ setup_hifi_library(${TARGET_NAME})
 include(${MACRO_DIR}/IncludeGLM.cmake)
 include_glm(${TARGET_NAME} "${ROOT_DIR}")
 
-include_directories("${GNUTLS_INCLUDE_DIR}")
+include_directories(SYSTEM "${GNUTLS_INCLUDE_DIR}")
 target_link_libraries(${TARGET_NAME} Qt5::Network "${GNUTLS_LIBRARY}")
\ No newline at end of file
diff --git a/libraries/octree/CMakeLists.txt b/libraries/octree/CMakeLists.txt
index a4758e52f3..9118ee6215 100644
--- a/libraries/octree/CMakeLists.txt
+++ b/libraries/octree/CMakeLists.txt
@@ -28,6 +28,6 @@ link_hifi_library(networking ${TARGET_NAME} "${ROOT_DIR}")
 find_package(ZLIB)
 find_package(GnuTLS REQUIRED)
 
-include_directories("${ZLIB_INCLUDE_DIRS}" "${GNUTLS_INCLUDE_DIR}")
+include_directories(SYSTEM "${ZLIB_INCLUDE_DIRS}" "${GNUTLS_INCLUDE_DIR}")
 
 target_link_libraries(${TARGET_NAME} "${ZLIB_LIBRARIES}" Qt5::Widgets "${GNUTLS_LIBRARY}")
\ No newline at end of file
diff --git a/libraries/particles/CMakeLists.txt b/libraries/particles/CMakeLists.txt
index 4df0859195..2cd5a1644b 100644
--- a/libraries/particles/CMakeLists.txt
+++ b/libraries/particles/CMakeLists.txt
@@ -29,5 +29,5 @@ link_hifi_library(networking ${TARGET_NAME} "${ROOT_DIR}")
 find_package(ZLIB)
 find_package(GnuTLS REQUIRED)
 
-include_directories("${ZLIB_INCLUDE_DIRS}" "${GNUTLS_INCLUDE_DIR}")
+include_directories(SYSTEM "${ZLIB_INCLUDE_DIRS}" "${GNUTLS_INCLUDE_DIR}")
 target_link_libraries(${TARGET_NAME} "${ZLIB_LIBRARIES}" Qt5::Widgets "${GNUTLS_LIBRARY}")
\ No newline at end of file
diff --git a/libraries/voxels/CMakeLists.txt b/libraries/voxels/CMakeLists.txt
index 68ce7c13aa..c39525e279 100644
--- a/libraries/voxels/CMakeLists.txt
+++ b/libraries/voxels/CMakeLists.txt
@@ -30,6 +30,6 @@ link_hifi_library(networking ${TARGET_NAME} "${ROOT_DIR}")
 find_package(ZLIB)
 find_package(GnuTLS REQUIRED)
 
-include_directories("${ZLIB_INCLUDE_DIRS}" "${GNUTLS_INCLUDE_DIR}")
+include_directories(SYSTEM "${ZLIB_INCLUDE_DIRS}" "${GNUTLS_INCLUDE_DIR}")
 
 target_link_libraries(${TARGET_NAME} "${ZLIB_LIBRARIES}" "${GNUTLS_LIBRARY}" Qt5::Widgets Qt5::Script)
\ No newline at end of file
diff --git a/voxel-edit/CMakeLists.txt b/voxel-edit/CMakeLists.txt
index 883b1debe4..0717aea479 100644
--- a/voxel-edit/CMakeLists.txt
+++ b/voxel-edit/CMakeLists.txt
@@ -36,7 +36,7 @@ link_hifi_library(networking ${TARGET_NAME} "${ROOT_DIR}")
 
 # link GnuTLS
 find_package(GnuTLS REQUIRED)
-include_directories("${GNUTLS_INCLUDE_DIR}")
+include_directories(SYSTEM "${GNUTLS_INCLUDE_DIR}")
 
 IF (WIN32)
 	target_link_libraries(${TARGET_NAME} Winmm Ws2_32)