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Add condition to check CMAKE_SYSTEM_VERSION defined #2204

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2 changes: 1 addition & 1 deletion CMakeLists.txt
Original file line number Diff line number Diff line change
Expand Up @@ -117,7 +117,7 @@ if(BUILD_SHARED_LIBS AND WIN32 AND HTTPLIB_COMPILE)
set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
endif()

if(CMAKE_SYSTEM_NAME MATCHES "Windows" AND ${CMAKE_SYSTEM_VERSION} VERSION_LESS "10.0.0")
if(CMAKE_SYSTEM_NAME MATCHES "Windows" AND DEFINED CMAKE_SYSTEM_VERSION AND CMAKE_SYSTEM_VERSION VERSION_LESS "10.0.0")
message(SEND_ERROR "Windows ${CMAKE_SYSTEM_VERSION} or lower is not supported. Please use Windows 10 or later.")
endif()
if(CMAKE_SIZEOF_VOID_P LESS 8)
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