diff --git a/.gitignore b/.gitignore
index b753d1cf66..6c60a2834b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -41,6 +41,7 @@ build
 external_deps/*
 !external_deps/build.sh
 !external_deps/sdk-build.sh
+!external_deps/versions.cmake
 !external_deps/cygtar.py
 !external_deps/*.patch
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 752b0230dc..387f9738ab 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -204,9 +204,7 @@ else()
     set(FULL_OUTPUT_DIR ${CMAKE_BINARY_DIR}/${CMAKE_CFG_INTDIR})
 endif()
 
-# Dependencies versions
-set(DEPS_VERSION 11) # This must match the number in external_deps/build.sh
-set(SAIGOSDK_VERSION 20261030) # This must match the number in external_deps/sdk-build.sh
+include(${CMAKE_CURRENT_SOURCE_DIR}/external_deps/versions.cmake)
 
 option(USE_EXTERNAL_DEPS "Download or reuse dependencies from EXTERNAL_DEPS_DIR (mandatory for building and running NaCl .nexe binaries)." ON)
 
diff --git a/external_deps/build.sh b/external_deps/build.sh
index f3ae7b1f98..bbdd8f848c 100755
--- a/external_deps/build.sh
+++ b/external_deps/build.sh
@@ -6,10 +6,9 @@ set -u -e -o pipefail
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"
 WORK_DIR="${PWD}"
 
-# This should match the DEPS_VERSION in CMakeLists.txt.
-# This is mostly to ensure the path the files end up at if you build deps yourself
-# are the same as the ones when extracting from the downloaded packages.
-DEPS_VERSION=11
+# Define DEPS_VERSION
+versions_out="$(cmake -P "${SCRIPT_DIR}/versions.cmake" 2>&1)"
+eval "${versions_out}"
 
 # Package download pages
 PKGCONFIG_BASEURL='https://pkg-config.freedesktop.org/releases'
diff --git a/external_deps/sdk-build.sh b/external_deps/sdk-build.sh
index a912a1edde..4574b347c7 100755
--- a/external_deps/sdk-build.sh
+++ b/external_deps/sdk-build.sh
@@ -7,12 +7,9 @@ SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"
 WORK_DIR="${PWD}"
 DOWNLOAD_DIR="${WORK_DIR}/download_cache"
 
-# This should match the SAIGOSDK_VERSION in CMakeLists.txt.
-# This is mostly to ensure the path the files end up at if you build deps yourself
-# are the same as the ones when extracting from the downloaded packages.
-SAIGOSDK_VERSION=20261030
-# Can be a tag like v${SAIGOSDK_VERSION}, or a full commit hash
-SAIGOSDK_REF="v${SAIGOSDK_VERSION}"
+# Define SAIGOSDK_VERSION/SAIGOSDK_REF
+versions_out="$(cmake -P "${SCRIPT_DIR}/versions.cmake" 2>&1)"
+eval "${versions_out}"
 
 REPO_BASENAME=saigo-nacl-sdk
 REPO_URL="https://github.com/DaemonEngine/${REPO_BASENAME}"
diff --git a/external_deps/versions.cmake b/external_deps/versions.cmake
new file mode 100644
index 0000000000..85661aad72
--- /dev/null
+++ b/external_deps/versions.cmake
@@ -0,0 +1,49 @@
+# Daemon BSD Source Code
+# Copyright (c) 2026, Daemon Developers
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#  * Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#  * Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#  * Neither the name of the Daemon developers nor the
+#    names of its contributors may be used to endorse or promote products
+#    derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL DAEMON DEVELOPERS BE LIABLE FOR ANY
+# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+macro(DefineVersionConstant name value)
+    set(${name} "${value}")
+    if (CMAKE_SCRIPT_MODE_FILE MATCHES versions.cmake)
+        # For use by shell scripts via cmake -P mode
+        message("${name}='${value}'")
+    endif()
+endmacro()
+
+
+# DEPS_VERSION and SAIGOSDK_VERSION are used to version packages which may be auto-downloaded
+# by CMake. The numbers are also included in the install path if you use the scripts to build them
+# yourself, so that they end up in the same path used by the download.
+
+# Version for the target-specific library and runtime dependencies package.
+# Can be auto-downloaded by CMake or built with build.sh.
+DefineVersionConstant(DEPS_VERSION 11)
+
+# Version for the host mode Saigo NaCl SDK package.
+# Can be auto-downloaded by CMake (when building NaCl gamelogic) or built with sdk-build.sh.
+DefineVersionConstant(SAIGOSDK_VERSION 20261030)
+# Only used by sdk-build.sh, but it's closely coupled to SAIGOSDK_VERSION.
+# Can be a tag like v${SAIGOSDK_VERSION}, or a full commit hash.
+DefineVersionConstant(SAIGOSDK_REF "v${SAIGOSDK_VERSION}")