--- a/CMakeLists.txt	2026-01-31 11:47:52.716708996 +0100
+++ b/CMakeLists.txt	2026-01-31 11:52:58.875201400 +0100
@@ -253,7 +253,7 @@
 set(CMAKE_XCODE_ATTRIBUTE_ONLY_ACTIVE_ARCH[variant=Debug] YES)
 
 #Check for endian
-if(${CMAKE_VERSION} VERSION_LESS "3.20.0") 
+if(${CMAKE_VERSION} VERSION_LESS "3.20.0")
 	include(TestBigEndian)
 	test_big_endian(VCMI_ENDIAN_BIG)
 	if(VCMI_ENDIAN_BIG)
@@ -506,7 +506,19 @@
 		add_library(SDL2::TTF ALIAS SDL2_ttf::SDL2_ttf-static)
 	endif()
 
-	find_package(libsquish REQUIRED)
+	if(EXISTS "${CMAKE_SOURCE_DIR}/external/libsquish/CMakeLists.txt")
+    add_subdirectory(external/libsquish)
+    if(NOT TARGET libsquish::libsquish)
+      add_library(libsquish::libsquish ALIAS libsquish_squish)
+      target_include_directories(libsquish_squish INTERFACE
+        $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/external/libsquish/lib/include>
+        $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/external/libsquish/lib/include/squish>
+        $<BUILD_INTERFACE:${CMAKE_BINARY_DIR}/external/libsquish/lib/include>
+      )
+    endif()
+  else()
+    find_package(libsquish REQUIRED)
+  endif()
 endif()
 
 if(ENABLE_LOBBY)