diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9e750cab..785bf6a3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -650,6 +650,7 @@ endif()
 if(ISLE_BUILD_ASSETS)
   message(STATUS "Asset building is enabled")
   set(GENERATED_ASSETS_DIR "${CMAKE_BINARY_DIR}/assets")
+  set(GENERATED_ASSETS_DEPFILE "${GENERATED_ASSETS_DIR}/.d")
 
   add_executable(asset_generator EXCLUDE_FROM_ALL
     assets/main.cpp
@@ -659,8 +660,9 @@ if(ISLE_BUILD_ASSETS)
 
   add_custom_command(
     OUTPUT  ${GENERATED_ASSETS_DIR}/.stamp
+    DEPFILE ${GENERATED_ASSETS_DEPFILE}
     COMMAND ${CMAKE_COMMAND} -E make_directory ${GENERATED_ASSETS_DIR}
-    COMMAND $<TARGET_FILE:asset_generator> ${GENERATED_ASSETS_DIR}
+    COMMAND $<TARGET_FILE:asset_generator> ${GENERATED_ASSETS_DIR} ${GENERATED_ASSETS_DEPFILE}
     COMMAND ${CMAKE_COMMAND} -E touch ${GENERATED_ASSETS_DIR}/.stamp
     WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/assets
     DEPENDS asset_generator
diff --git a/assets/main.cpp b/assets/main.cpp
index 7dcace2b..e1189012 100644
--- a/assets/main.cpp
+++ b/assets/main.cpp
@@ -1,6 +1,8 @@
 #include "mxdsaction.h"
 
 #include <file.h>
+#include <filesystem>
+#include <fstream>
 #include <interleaf.h>
 #include <object.h>
 
@@ -9,11 +11,13 @@ uint32_t bufferSize = 65536;
 uint32_t bufferCount = 8;
 
 std::string out;
+std::ofstream depfile;
 si::MemoryBuffer mxHd;
 
 void CreateWidescreen()
 {
 	si::Interleaf si;
+	std::string file = out + "/widescreen.si";
 	mxHd.seek(0, si::MemoryBuffer::SeekStart);
 	si.Read(&mxHd);
 
@@ -33,13 +37,15 @@ void CreateWidescreen()
 	GaraDoor_Wide.up_.y = 1.0;
 	GaraDoor_Wide.ReplaceWithFile("widescreen/garadoor.bmp");
 	si.AppendChild(&GaraDoor_Wide);
+	depfile << file << ": " << (std::filesystem::current_path() / "widescreen/garadoor.bmp").string() << std::endl;
 
-	si.Write((out + "/widescreen.si").c_str());
+	si.Write(file.c_str());
 }
 
 int main(int argc, char* argv[])
 {
 	out = argv[1];
+	depfile = std::ofstream(argv[2]);
 
 	mxHd.WriteU32(si::RIFF::MxHd);
 	mxHd.WriteU32(3 * sizeof(uint32_t));