问为什么CMake要从INCLUDE_DIRECTORIES()调用中删除一些包含目录？

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cmake -G"MinGW Makefiles" -DCMAKE_TOOLCHAIN_FILE=toolchain-vde.cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=C:\vf-install ..

# the name of the target operating system
set(CMAKE_SYSTEM_NAME Linux)

# which compilers to use for C and C++
include(CMakeForceCompiler)
#Use 8.1 names if path has spaces since it will break on paths with spaces
set(CMAKE_C_COMPILER "C:/VDE/toolchains/windows/vos/arm-vf-linux-gnueabi/bin/arm-vf-linux-gnueabi-gcc.exe")
set(CMAKE_CXX_COMPILER "C:/VDE/toolchains/windows/vos/arm-vf-linux-gnueabi/bin/arm-vf-linux-gnueabi-g++.exe")

# here is the target environment located
SET(VF_SYSROOT "C:/VDE/SDKs/vos/default")


#Vf includes and libs
#Declared as variables for compatibility and usage by CMake scripts down the line
SET(VF_ADK_INCLUDE       "C:\\VDE\\ADKs\\default\\vos\\include")
SET(VF_ADK_LIB           "C:/VDE/ADKs/default/vos/lib")
SET(VF_SDK_USR_LIB       "${VF_SYSROOT}/usr/lib")
SET(VF_SDK_USR_LOCAL_LIB "${VF_SYSROOT}/usr/local/lib")
SET(VF_SDK_USR           "${VF_SDK_USR_LIB}") #<-- Compatibility with old Vf detection
SET(VF_SVCMGR            "${VF_SYSROOT}/usr/local/lib/svcmgr")

MESSAGE("debug1: --- ${VF_ADK_INCLUDE} --- ${VF_SYSROOT} ---")

SET(CMAKE_SYSROOT "${VF_SYSROOT}")

#Define variables for compiler and CMAKE scripts
set(VF_UX_410 TRUE)
add_definitions(-DVF_UX_410="${VF_UX_410}")

LINK_DIRECTORIES("${CMAKE_INSTALL_PREFIX}/lib")

set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY BOTH)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE BOTH)

set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -lrt --std=gnu99")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -lrt")

LIST(APPEND CMAKE_PREFIX_PATH "${CMAKE_INSTALL_PREFIX}")
INCLUDE_DIRECTORIES("${CMAKE_INSTALL_PREFIX}/include")
INCLUDE_DIRECTORIES("${VF_ADK_INCLUDE}")

INCLUDE_DIRECTORIES(
  "X:\\"
  "C:\\VDE\\ADKs\\default\\vos\\include"
  "Y:\\"
)