diff --git a/CMakeLists.txt b/CMakeLists.txt
index a021f7a7e5..752b0230dc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -166,6 +166,12 @@ set(NACL_VM_INHERITED_OPTIONS "${DEFAULT_NACL_VM_INHERITED_OPTIONS}" CACHE STRIN
     "Semicolon-separated list of options for which NaCl game VMs should use the same value as the other binaries")
 mark_as_advanced(NACL_VM_INHERITED_OPTIONS)
 
+# Warning: changing SAIGOSDK_DIR/SAIGOSDK_VERSION after subprojects have been configured WILL
+# change the compiler, but it is a bad idea since flag tests and such (not to mention the actual
+# compiled artifacts) will be out of date.
+set(SAIGOSDK_DIR "" CACHE PATH "Override Saigo NaCl SDK path")
+mark_as_advanced(SAIGOSDK_DIR)
+
 ################################################################################
 # Directories
 ################################################################################
@@ -275,8 +281,8 @@ endif()
 
 option(USE_EXTERNAL_DEPS_LIBS "Build and link against libraries from the EXTERNAL_DEPS_DIR" ${DEFAULT_USE_EXTERNAL_DEPS_LIBS})
 
-set(PNACLSDK_PREFIX "${DEPS_DIR}/pnacl" CACHE PATH "PNaCl SDK path")
-mark_as_advanced(PNACLSDK_PREFIX)
+set(PNACLSDK_DIR "${DEPS_DIR}/pnacl" CACHE PATH "PNaCl SDK path")
+mark_as_advanced(PNACLSDK_DIR)
 
 if (USE_EXTERNAL_DEPS AND NOT YOKAI_TARGET_SYSTEM_NACL)
     if (DEPS_DIR)
@@ -456,7 +462,7 @@ if (DEPS_DIR)
         endif()
     endif()
 
-    if (BUILD_GAME_NACL AND USE_NACL_SAIGO AND NOT SAIGOSDK_PREFIX)
+    if (BUILD_GAME_NACL AND USE_NACL_SAIGO AND NOT SAIGOSDK_DIR)
         include(DaemonDependenciesDownload)
         download_saigosdk()
     endif()
diff --git a/cmake/DaemonDependenciesDownload.cmake b/cmake/DaemonDependenciesDownload.cmake
index 2313300d3e..3caec7aa16 100644
--- a/cmake/DaemonDependenciesDownload.cmake
+++ b/cmake/DaemonDependenciesDownload.cmake
@@ -26,18 +26,14 @@
 
 # TODO: Move other deps downloading code in here.
 
-set(SAIGOSDK_BASENAME "saigosdk-${DEPS_SYSTEM}-${DEPS_ARCH}_${SAIGOSDK_VERSION}")
-
-# Warning: changing SAIGOSDK_PREFIX/SAIGOSDK_VERSION after subprojects have been configured WILL
-# change the compiler, but it is a bad idea since flag tests and such (not to mention the actual
-# compiled artifacts) will be out of date.
-set(SAIGOSDK_PREFIX "${EXTERNAL_DEPS_DIR}/${SAIGOSDK_BASENAME}" CACHE PATH "PNaCl SDK path")
-mark_as_advanced(SAIGOSDK_PREFIX)
-
 # As an alternative to downloading, external_deps/sdk-build.sh can be used, to build the host-mode
 # dependencies and install them in the expected path.
+
+# Download the SDK, if it is not already there. Upon success, cache the path in SAIGOSDK_DIR.
 function(download_saigosdk)
-    if (NOT EXISTS "${SAIGOSDK_PREFIX}")
+    string(TOLOWER "${YOKAI_HOST_SYSTEM_NAME}" HOST_SYSTEM_SLUG)
+    set(SAIGOSDK_BASENAME "saigosdk-${HOST_SYSTEM_SLUG}-${YOKAI_HOST_ARCH_NAME}_${SAIGOSDK_VERSION}")
+    if (NOT EXISTS "${EXTERNAL_DEPS_DIR}/${SAIGOSDK_BASENAME}")
         set(DEPS_FILENAME "${SAIGOSDK_BASENAME}.tar.xz")
         set(REMOTE "https://github.com/DaemonEngine/saigo-nacl-sdk/releases/download/v${SAIGOSDK_VERSION}/${DEPS_FILENAME}")
         message(STATUS "Downloading NaCl SDK from '${REMOTE}'")
@@ -71,4 +67,6 @@ function(download_saigosdk)
             message(FATAL_ERROR "Could not extract ${DEPS_FILENAME}")
         endif()
     endif()
+    # Set SAIGOSDK_DIR in the cache now that it is known to have been created
+    set_property(CACHE SAIGOSDK_DIR PROPERTY VALUE "${EXTERNAL_DEPS_DIR}/${SAIGOSDK_BASENAME}")
 endfunction()
diff --git a/cmake/DaemonGame.cmake b/cmake/DaemonGame.cmake
index b4c449fd8f..31c790f3ac 100644
--- a/cmake/DaemonGame.cmake
+++ b/cmake/DaemonGame.cmake
@@ -227,8 +227,8 @@ function(GAMEMODULE)
 
 		if (BUILD_GAME_NACL AND NOT YOKAI_TARGET_SYSTEM_NACL)
 			if (USE_NACL_SAIGO)
-				if (NOT IS_DIRECTORY "${SAIGOSDK_PREFIX}")
-					message(FATAL_ERROR "SAIGOSDK_PREFIX configured as '${SAIGOSDK_PREFIX}' which is not an existing directory")
+				if (NOT IS_DIRECTORY "${SAIGOSDK_DIR}")
+					message(FATAL_ERROR "SAIGOSDK_DIR configured as '${SAIGOSDK_DIR}' which is not an existing directory")
 				endif()
 
 				add_custom_target(nacl-vms ALL)
@@ -246,7 +246,7 @@ function(GAMEMODULE)
 					# TODO: Remove USE_NACL_SAIGO once the game uses YOKAI_TARGET_SYSTEM_NACL.
 					gameSubProject(
 						"-DCMAKE_TOOLCHAIN_FILE=${Daemon_SOURCE_DIR}/cmake/cross-toolchain-saigo-${nacl_target}.cmake"
-						"-DSAIGOSDK_PREFIX=${SAIGOSDK_PREFIX}"
+						"-DSAIGOSDK_DIR=${SAIGOSDK_DIR}"
 						-DUSE_NACL_SAIGO=ON
 						-DBUILD_GAME_NACL=ON
 						-DBUILD_GAME_NATIVE_DLL=OFF
@@ -255,8 +255,8 @@ function(GAMEMODULE)
 					)
 				endforeach()
 			else()
-				if (NOT IS_DIRECTORY "${PNACLSDK_PREFIX}")
-					message(FATAL_ERROR "PNACLSDK_PREFIX configured as '${PNACLSDK_PREFIX}' which is not an existing directory")
+				if (NOT IS_DIRECTORY "${PNACLSDK_DIR}")
+					message(FATAL_ERROR "PNACLSDK_DIR configured as '${PNACLSDK_DIR}' which is not an existing directory")
 				endif()
 
 				set(NACL_VMS_PROJECT nacl-vms)
@@ -267,7 +267,7 @@ function(GAMEMODULE)
 
 				gameSubProject(
 					"-DCMAKE_TOOLCHAIN_FILE=${Daemon_SOURCE_DIR}/cmake/cross-toolchain-pnacl.cmake"
-					"-DPNACLSDK_PREFIX=${PNACLSDK_PREFIX}"
+					"-DPNACLSDK_DIR=${PNACLSDK_DIR}"
 					-DUSE_NACL_SAIGO=OFF
 					-DBUILD_GAME_NACL=ON
 					-DBUILD_GAME_NATIVE_DLL=OFF
diff --git a/cmake/cross-toolchain-pnacl.cmake b/cmake/cross-toolchain-pnacl.cmake
index eb71dbc5cc..64abf57dcb 100644
--- a/cmake/cross-toolchain-pnacl.cmake
+++ b/cmake/cross-toolchain-pnacl.cmake
@@ -37,22 +37,22 @@ endif()
 
 set(PNACL_TRIPLET "pnacl")
 
-if ("${PNACLSDK_PREFIX}" STREQUAL "")
+if ("${PNACLSDK_DIR}" STREQUAL "")
 	find_program(PATH_PNACL_CLANG NAMES "${PNACL_TRIPLET}-clang${PNACL_EXECUTABLE_SUFFIX}")
-	get_filename_component(PNACLSDK_PREFIX ${PATH_PNACL_CLANG} DIRECTORY)
+	get_filename_component(PNACLSDK_DIR ${PATH_PNACL_CLANG} DIRECTORY)
 endif()
 
-list(APPEND CMAKE_TRY_COMPILE_PLATFORM_VARIABLES PNACLSDK_PREFIX)
+list(APPEND CMAKE_TRY_COMPILE_PLATFORM_VARIABLES PNACLSDK_DIR)
 
 set(CMAKE_SYSTEM_NAME "Generic")
 
-set(CMAKE_C_COMPILER "${PNACLSDK_PREFIX}/bin/${PNACL_TRIPLET}-clang${PNACL_EXECUTABLE_SUFFIX}")
-set(CMAKE_CXX_COMPILER "${PNACLSDK_PREFIX}/bin/${PNACL_TRIPLET}-clang++${PNACL_EXECUTABLE_SUFFIX}")
-set(CMAKE_AR "${PNACLSDK_PREFIX}/bin/${PNACL_TRIPLET}-ar${PNACL_EXECUTABLE_SUFFIX}" CACHE FILEPATH "Archiver" FORCE)
-set(CMAKE_RANLIB "${PNACLSDK_PREFIX}/bin/${PNACL_TRIPLET}-ranlib${PNACL_EXECUTABLE_SUFFIX}")
-set(PNACL_TRANSLATE "${PNACLSDK_PREFIX}/bin/${PNACL_TRIPLET}-translate${PNACL_EXECUTABLE_SUFFIX}")
-set(CMAKE_STRIP "${PNACLSDK_PREFIX}/bin/${PNACL_TRIPLET}-strip${PNACL_EXECUTABLE_SUFFIX}")
-set(CMAKE_FIND_ROOT_PATH "${PNACLSDK_PREFIX}/le32-nacl")
+set(CMAKE_C_COMPILER "${PNACLSDK_DIR}/bin/${PNACL_TRIPLET}-clang${PNACL_EXECUTABLE_SUFFIX}")
+set(CMAKE_CXX_COMPILER "${PNACLSDK_DIR}/bin/${PNACL_TRIPLET}-clang++${PNACL_EXECUTABLE_SUFFIX}")
+set(CMAKE_AR "${PNACLSDK_DIR}/bin/${PNACL_TRIPLET}-ar${PNACL_EXECUTABLE_SUFFIX}" CACHE FILEPATH "Archiver" FORCE)
+set(CMAKE_RANLIB "${PNACLSDK_DIR}/bin/${PNACL_TRIPLET}-ranlib${PNACL_EXECUTABLE_SUFFIX}")
+set(PNACL_TRANSLATE "${PNACLSDK_DIR}/bin/${PNACL_TRIPLET}-translate${PNACL_EXECUTABLE_SUFFIX}")
+set(CMAKE_STRIP "${PNACLSDK_DIR}/bin/${PNACL_TRIPLET}-strip${PNACL_EXECUTABLE_SUFFIX}")
+set(CMAKE_FIND_ROOT_PATH "${PNACLSDK_DIR}/le32-nacl")
 
 set(CMAKE_C_USE_RESPONSE_FILE_FOR_LIBRARIES 1)
 set(CMAKE_CXX_USE_RESPONSE_FILE_FOR_LIBRARIES 1)
diff --git a/cmake/cross-toolchain-saigo-common.cmake b/cmake/cross-toolchain-saigo-common.cmake
index 0c7a928e40..580ef0eccd 100644
--- a/cmake/cross-toolchain-saigo-common.cmake
+++ b/cmake/cross-toolchain-saigo-common.cmake
@@ -24,27 +24,31 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+if (CMAKE_HOST_WIN32)
+	set(SAIGOSDK_BIN_EXT ".exe")
+endif()
+
 # We can't use CMAKE_EXECUTABLE_SUFFIX because the Generic Platform will reset it
 # and creating a Platform module for setting CMAKE_EXECUTABLE_SUFFIX is overkill.
 set(NACL_EXECUTABLE_SUFFIX ".nexe")
 
 set(SAIGO_TRIPLET "${SAIGO_ARCH}-nacl")
 
-if ("${SAIGOSDK_PREFIX}" STREQUAL "")
+if ("${SAIGOSDK_DIR}" STREQUAL "")
 	find_program(PATH_SAIGO_CLANG NAMES "${SAIGO_TRIPLET}-clang")
-	get_filename_component(SAIGOSDK_PREFIX ${PATH_SAIGO_CLANG} DIRECTORY)
+	get_filename_component(SAIGOSDK_DIR ${PATH_SAIGO_CLANG} DIRECTORY)
 endif()
 
-list(APPEND CMAKE_TRY_COMPILE_PLATFORM_VARIABLES SAIGOSDK_PREFIX)
+list(APPEND CMAKE_TRY_COMPILE_PLATFORM_VARIABLES SAIGOSDK_DIR)
 
 set(CMAKE_SYSTEM_NAME "Generic")
 
-set(CMAKE_C_COMPILER "${SAIGOSDK_PREFIX}/bin/${SAIGO_TRIPLET}-clang")
-set(CMAKE_CXX_COMPILER "${SAIGOSDK_PREFIX}/bin/${SAIGO_TRIPLET}-clang++")
-set(CMAKE_AR "${SAIGOSDK_PREFIX}/bin/${SAIGO_TRIPLET}-ar" CACHE FILEPATH "Archiver" FORCE)
-set(CMAKE_RANLIB "${SAIGOSDK_PREFIX}/bin/${SAIGO_TRIPLET}-ranlib")
-set(CMAKE_STRIP "${SAIGOSDK_PREFIX}/bin/${SAIGO_TRIPLET}-strip")
-set(CMAKE_FIND_ROOT_PATH "${SAIGOSDK_PREFIX}/${SAIGO_TRIPLET}")
+set(CMAKE_C_COMPILER "${SAIGOSDK_DIR}/bin/${SAIGO_TRIPLET}-clang${SAIGOSDK_BIN_EXT}")
+set(CMAKE_CXX_COMPILER "${SAIGOSDK_DIR}/bin/${SAIGO_TRIPLET}-clang++${SAIGOSDK_BIN_EXT}")
+set(CMAKE_AR "${SAIGOSDK_DIR}/bin/${SAIGO_TRIPLET}-ar${SAIGOSDK_BIN_EXT}" CACHE FILEPATH "Archiver" FORCE)
+set(CMAKE_RANLIB "${SAIGOSDK_DIR}/bin/${SAIGO_TRIPLET}-ranlib${SAIGOSDK_BIN_EXT}")
+set(CMAKE_STRIP "${SAIGOSDK_DIR}/bin/${SAIGO_TRIPLET}-strip${SAIGOSDK_BIN_EXT}")
+set(CMAKE_FIND_ROOT_PATH "${SAIGOSDK_DIR}/${SAIGO_TRIPLET}")
 
 # Copy-pasted from the PNaCl toolchain, it's not sure we need it.
 set(CMAKE_C_USE_RESPONSE_FILE_FOR_LIBRARIES 1)
diff --git a/cmake/cross-toolchain-saigo-i686.cmake b/cmake/cross-toolchain-saigo-i686.cmake
index 1bd9b1f0c5..2dd3bf960c 100644
--- a/cmake/cross-toolchain-saigo-i686.cmake
+++ b/cmake/cross-toolchain-saigo-i686.cmake
@@ -27,13 +27,13 @@
 set(SAIGO_ARCH "i686")
 include("${CMAKE_CURRENT_LIST_DIR}/cross-toolchain-saigo-common.cmake")
 
-if (EXISTS "${SAIGOSDK_PREFIX}/x86_64-nacl/lib32")
+if (EXISTS "${SAIGOSDK_DIR}/x86_64-nacl/lib32")
 	# This will search libraries in paths in this order:
 	# - i686-nacl/lib
 	# - x86_64-nacl/lib32
 	# - x86_64-nacl/lib
 	# The last path is wrong but is not used when the lib is found before,
 	# so it is meant to work on well-formed SDK installations.
-	list(APPEND CMAKE_FIND_ROOT_PATH "${SAIGOSDK_PREFIX}/x86_64-nacl")
+	list(APPEND CMAKE_FIND_ROOT_PATH "${SAIGOSDK_DIR}/x86_64-nacl")
 	set(CMAKE_FIND_LIBRARY_CUSTOM_LIB_SUFFIX "32")
 endif()