--- cmake/range-v3.cmake.orig	2023-03-15 20:36:47.000000000 +0800
+++ cmake/range-v3.cmake	2023-03-15 20:37:39.000000000 +0800
@@ -1,36 +1,11 @@
-include(ExternalProject)
-
 if (${CMAKE_SYSTEM_NAME} STREQUAL "Emscripten")
     set(RANGE_V3_CMAKE_COMMAND emcmake cmake)
 else()
     set(RANGE_V3_CMAKE_COMMAND ${CMAKE_COMMAND})
 endif()
 
-set(prefix "${CMAKE_BINARY_DIR}/deps")
-set(RANGE_V3_INCLUDE_DIR "${prefix}/include")
-
-ExternalProject_Add(range-v3-project
-    PREFIX "${prefix}"
-    DOWNLOAD_DIR "${CMAKE_SOURCE_DIR}/deps/downloads"
-    DOWNLOAD_NAME range-v3-0.12.0.tar.gz
-    URL https://github.com/ericniebler/range-v3/archive/0.12.0.tar.gz
-    URL_HASH SHA256=015adb2300a98edfceaf0725beec3337f542af4915cec4d0b89fa0886f4ba9cb
-    CMAKE_COMMAND ${RANGE_V3_CMAKE_COMMAND}
-    CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=<INSTALL_DIR>
-               -DCMAKE_CXX_COMPILER=${CMAKE_CXX_COMPILER}
-               -DBUILD_TESTING=OFF
-               -DRANGES_CXX_STD=${CMAKE_CXX_STANDARD}
-               -DRANGE_V3_DOCS=OFF
-               -DRANGE_V3_EXAMPLES=OFF
-               -DRANGE_V3_TESTS=OFF
-               -DRANGES_BUILD_CALENDAR_EXAMPLE=OFF
-               -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
-    BUILD_BYPRODUCTS "${RANGE_V3_INCLUDE_DIR}/range/v3/all.hpp"
-)
-
 # Create range-v3 imported library
 add_library(range-v3 INTERFACE IMPORTED)
-file(MAKE_DIRECTORY ${RANGE_V3_INCLUDE_DIR})  # Must exist.
 set_target_properties(range-v3 PROPERTIES
     INTERFACE_COMPILE_OPTIONS "\$<\$<CXX_COMPILER_ID:MSVC>:/permissive->"
     INTERFACE_SYSTEM_INCLUDE_DIRECTORIES ${RANGE_V3_INCLUDE_DIR}