diff --git a/CMakeLists.txt b/CMakeLists.txt
index cc3abcd41..71d8a738a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -367,7 +367,10 @@ include(LinkerGC)
 
 ## Externals ##
 
-find_package(unordered_dense QUIET CONFIG)
+if (NOT BUILD_STEAM_SUPPORT)
+  find_package(unordered_dense QUIET CONFIG)
+endif()
+
 if (NOT unordered_dense_FOUND)
   add_subdirectory(External/unordered_dense)
 endif()
@@ -378,8 +381,10 @@ if (BUILD_TESTING OR ENABLE_VIXL_DISASSEMBLER OR ENABLE_VIXL_SIMULATOR)
 endif()
 
 if (ENABLE_ZYDIS)
-  find_package(Zycore 1.5 MODULE QUIET)
-  find_package(Zydis 4.0 MODULE QUIET)
+  if (NOT BUILD_STEAM_SUPPORT)
+    find_package(Zycore 1.5 MODULE QUIET)
+    find_package(Zydis 4.0 MODULE QUIET)
+  endif()
 
   if (TARGET Zydis::Zydis AND TARGET Zycore::Zycore)
     message(STATUS "Using system Zydis")
@@ -400,7 +405,7 @@ find_package(Python 3.9 REQUIRED COMPONENTS Interpreter)
 
 set(BUILD_SHARED_LIBS OFF)
 
-if (NOT CMAKE_CROSSCOMPILING)
+if (NOT CMAKE_CROSSCOMPILING AND NOT BUILD_STEAM_SUPPORT)
   find_package(xxhash MODULE QUIET)
 endif()
 
@@ -428,7 +433,7 @@ else ()
   file(GENERATE OUTPUT CTestTestfile.cmake CONTENT "# No tests since BUILD_TESTING is disabled")
 endif()
 
-if (MINGW)
+if (MINGW OR BUILD_STEAM_SUPPORT)
   set(FMT_INSTALL OFF)
   add_subdirectory(External/fmt/)
 else()
@@ -440,7 +445,10 @@ else()
   endif()
 endif()
 
-find_package(range-v3 QUIET)
+if (NOT BUILD_STEAM_SUPPORT)
+  find_package(range-v3 QUIET)
+endif()
+
 if (NOT range-v3_FOUND)
   add_subdirectory(External/range-v3/)
   target_compile_definitions(range-v3 INTERFACE RANGES_DISABLE_DEPRECATED_WARNINGS)