diff --git a/CMakeLists.txt b/CMakeLists.txt
index a7455821f..b437bae29 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -43,7 +43,6 @@ set(MINIZIP_BUILD_DIR "${CMAKE_BINARY_DIR}/minizip_BUILD")
 set(MINIZIP_OUTPUT_DIR "${CMAKE_BINARY_DIR}/minizip_OUTPUT")
 set(APPLICATION_OUTPUT_DIR "${CMAKE_BINARY_DIR}/OUTPUT")
 message("minizip=${MINIZIP_OUTPUT_DIR} sdk=${LINPHONE_OUTPUT_DIR}")
-#list(APPEND CMAKE_PREFIX_PATH "${LINPHONE_OUTPUT_DIR};${MINIZIP_OUTPUT_DIR};${APPLICATION_OUTPUT_DIR}")
 set(PREFIX_PATH "${LINPHONE_OUTPUT_DIR}|${MINIZIP_OUTPUT_DIR}|${APPLICATION_OUTPUT_DIR}")
 
 # Avoid cmake warning if CMP0071 is not set.
@@ -77,7 +76,6 @@ option(ENABLE_TOOLS "Enable tools of SDK" NO)
 option(ENABLE_STRICT "Build with strict compilator flags e.g. -Wall -Werror" NO)
 
 option(ENABLE_FFMPEG "Build mediastreamer2 with ffmpeg video support." YES)
-option(ENABLE_OPUS "Build mediastreamer2 with the OPUS codec." YES)
 
 if(WIN32 OR APPLE)
 else()
@@ -86,29 +84,36 @@ endif()
 
 option(ENABLE_RELATIVE_PREFIX "Set Internal packages relative to the binary" YES)
 
-set(ALL_OPTIONS "-DENABLE_UPDATE_CHECK=${ENABLE_UPDATE_CHECK}")
-list(APPEND ALL_OPTIONS "-DENABLE_APP_PACKAGING=${ENABLE_APP_PACKAGING}")
-list(APPEND ALL_OPTIONS "-DENABLE_UNIT_TESTS=${ENABLE_UNIT_TESTS}")
-list(APPEND ALL_OPTIONS "-DENABLE_TESTS=${ENABLE_TESTS}")
-list(APPEND ALL_OPTIONS "-DENABLE_TESTS_COMPONENTS=${ENABLE_TESTS_COMPONENTS}")
-list(APPEND ALL_OPTIONS "-DENABLE_TOOLS=${ENABLE_TOOLS}")
-list(APPEND ALL_OPTIONS "-DENABLE_STRICT=${ENABLE_STRICT}")
-list(APPEND ALL_OPTIONS "-DENABLE_FFMPEG=${ENABLE_FFMPEG}")
-list(APPEND ALL_OPTIONS "-DENABLE_OPUS=${ENABLE_OPUS}")
+set(APP_OPTIONS "-DENABLE_UPDATE_CHECK=${ENABLE_UPDATE_CHECK}")
+list(APPEND APP_OPTIONS "-DENABLE_APP_PACKAGING=${ENABLE_APP_PACKAGING}")
+list(APPEND APP_OPTIONS "-DENABLE_UNIT_TESTS=${ENABLE_UNIT_TESTS}")
+list(APPEND APP_OPTIONS "-DENABLE_TESTS=${ENABLE_TESTS}")
+list(APPEND APP_OPTIONS "-DENABLE_TESTS_COMPONENTS=${ENABLE_TESTS_COMPONENTS}")
+list(APPEND APP_OPTIONS "-DENABLE_TOOLS=${ENABLE_TOOLS}")
+list(APPEND APP_OPTIONS "-DENABLE_STRICT=${ENABLE_STRICT}")
+list(APPEND APP_OPTIONS "-DENABLE_FFMPEG=${ENABLE_FFMPEG}")
+list(APPEND APP_OPTIONS "-DENABLE_OPUS=${ENABLE_OPUS}")
 if(ENABLE_V4L)
-    list(APPEND ALL_OPTIONS "-DENABLE_V4L=${ENABLE_V4L}")
+    list(APPEND APP_OPTIONS "-DENABLE_V4L=${ENABLE_V4L}")
 endif()
     
-list(APPEND ALL_OPTIONS "-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}")
-list(APPEND ALL_OPTIONS "-DLINPHONE_OUTPUT_DIR=${LINPHONE_OUTPUT_DIR}")
+list(APPEND APP_OPTIONS "-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}")
+list(APPEND APP_OPTIONS "-DLINPHONE_OUTPUT_DIR=${LINPHONE_OUTPUT_DIR}")
 
 include(ExternalProject)
-if(${CMAKE_VERSION} VERSION_LESS "3.12.0")
-    set(PROJECT_BUILD_COMMAND "")
-else()
-    list(APPEND PROJECT_BUILD_COMMAND "--parallel" "10")
+#Get all CMAKE_* variables to pass them to external projects
+include(linphone-sdk/cmake/LinphoneSdkUtils.cmake)
+linphone_sdk_get_inherited_cmake_args()
+list(APPEND APP_OPTIONS ${_inherited_cmake_args})
+set(PROJECT_BUILD_COMMAND "")
+if(CMAKE_BUILD_PARALLEL_LEVEL)
+    list(APPEND APP_OPTIONS "-DCMAKE_BUILD_PARALLEL_LEVEL=${CMAKE_BUILD_PARALLEL_LEVEL}") #add it because it was not added by the SDK
+    if(${CMAKE_VERSION} VERSION_LESS "3.12.0") #CMAKE_BUILD_PARALLEL_LEVEL will not always work for External projects
+        list(APPEND PROJECT_BUILD_COMMAND "--parallel" "${CMAKE_BUILD_PARALLEL_LEVEL}")
+    endif()
 endif()
 
+
 ExternalProject_Add(sdk PREFIX "${CMAKE_BINARY_DIR}/sdk"
     SOURCE_DIR "${CMAKE_SOURCE_DIR}/linphone-sdk"
     INSTALL_DIR "${LINPHONE_OUTPUT_DIR}"
@@ -118,7 +123,7 @@ ExternalProject_Add(sdk PREFIX "${CMAKE_BINARY_DIR}/sdk"
     BUILD_COMMAND ${CMAKE_COMMAND} --build <BINARY_DIR> --config $<CONFIG> ${PROJECT_BUILD_COMMAND}
     INSTALL_COMMAND cmake -E echo "Skipping install step."
     LIST_SEPARATOR | # Use the alternate list separator
-    CMAKE_ARGS ${ALL_OPTIONS} -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR> -DCMAKE_PREFIX_PATH=${PREFIX_PATH} ${USER_ARGS}
+    CMAKE_ARGS ${APP_OPTIONS} -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR> -DCMAKE_PREFIX_PATH=${PREFIX_PATH} ${USER_ARGS}
     #BUILD_ALWAYS NO #${DO_BUILD}
 )
 ExternalProject_Add_Step(sdk force_build
@@ -134,7 +139,7 @@ ExternalProject_Add(minizip PREFIX "${CMAKE_BINARY_DIR}/minizip"
 	DEPENDS sdk
 	BUILD_COMMAND ${CMAKE_COMMAND} --build <BINARY_DIR> --config $<CONFIG> ${PROJECT_BUILD_COMMAND}
 	LIST_SEPARATOR | # Use the alternate list separator
-	CMAKE_ARGS ${ALL_OPTIONS} -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR> -DCMAKE_PREFIX_PATH=${PREFIX_PATH} ${USER_ARGS} 
+	CMAKE_ARGS ${APP_OPTIONS} -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR> -DCMAKE_PREFIX_PATH=${PREFIX_PATH} ${USER_ARGS} 
 )
 ExternalProject_Add(linphone-qt PREFIX "${CMAKE_BINARY_DIR}/linphoneqt"
     SOURCE_DIR "${CMAKE_SOURCE_DIR}/linphone-desktop"
@@ -142,7 +147,7 @@ ExternalProject_Add(linphone-qt PREFIX "${CMAKE_BINARY_DIR}/linphoneqt"
     DEPENDS minizip sdk
     BUILD_COMMAND ${CMAKE_COMMAND} --build <BINARY_DIR> --config $<CONFIG> ${PROJECT_BUILD_COMMAND}
     LIST_SEPARATOR | # Use the alternate list separator
-    CMAKE_ARGS ${ALL_OPTIONS} -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR> -DCMAKE_PREFIX_PATH=${PREFIX_PATH} ${USER_ARGS}
+    CMAKE_ARGS ${APP_OPTIONS} -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR> -DCMAKE_PREFIX_PATH=${PREFIX_PATH} ${USER_ARGS}
     BUILD_ALWAYS ON
 )
 ExternalProject_Add(linphone-qt-only PREFIX "${CMAKE_BINARY_DIR}/linphoneqt"
@@ -150,6 +155,6 @@ ExternalProject_Add(linphone-qt-only PREFIX "${CMAKE_BINARY_DIR}/linphoneqt"
     INSTALL_DIR "${APPLICATION_OUTPUT_DIR}"
     BUILD_COMMAND ${CMAKE_COMMAND} --build <BINARY_DIR> --config $<CONFIG> ${PROJECT_BUILD_COMMAND}
     LIST_SEPARATOR | # Use the alternate list separator
-    CMAKE_ARGS ${ALL_OPTIONS} -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR> -DCMAKE_PREFIX_PATH=${PREFIX_PATH} ${USER_ARGS}
+    CMAKE_ARGS ${APP_OPTIONS} -DCMAKE_INSTALL_PREFIX:PATH=<INSTALL_DIR> -DCMAKE_PREFIX_PATH=${PREFIX_PATH} ${USER_ARGS}
     EXCLUDE_FROM_ALL ON
 )