diff --git a/CMakeLists.txt b/CMakeLists.txt
index e28b572..93c8dba 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -62,10 +62,39 @@ if(MARS_NWE_BUILD_DOSUTILS)
                 -fo="${CMAKE_CURRENT_BINARY_DIR}/kern.obj"
                 "${CMAKE_CURRENT_SOURCE_DIR}/kern_wasm.asm"
         DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/kern_wasm.asm"
-        WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+        WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
         VERBATIM
     )
 
+    set(DOSUTILS_OBJECTS)
+    foreach(src IN LISTS DOSUTILS_C_SOURCES)
+        get_filename_component(obj_name "${src}" NAME_WE)
+        set(obj "${CMAKE_CURRENT_BINARY_DIR}/${obj_name}.obj")
+        list(APPEND DOSUTILS_OBJECTS "${obj}")
+
+        add_custom_command(
+            OUTPUT "${obj}"
+            COMMAND "${CMAKE_COMMAND}" -E env ${OPENWATCOM_ENV}
+                    "${OPENWATCOM_WCL}"
+                    -q
+                    -zq
+                    -bt=dos
+                    -ml
+                    -0
+                    -c
+                    -fo="${obj}"
+                    "${CMAKE_CURRENT_SOURCE_DIR}/${src}"
+            DEPENDS
+                    "${CMAKE_CURRENT_SOURCE_DIR}/${src}"
+                    "${CMAKE_CURRENT_SOURCE_DIR}/net.h"
+                    "${CMAKE_CURRENT_SOURCE_DIR}/kern.h"
+                    "${CMAKE_CURRENT_SOURCE_DIR}/c32ncp.h"
+                    "${CMAKE_CURRENT_SOURCE_DIR}/nwcrypt.h"
+            WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
+            VERBATIM
+        )
+    endforeach()
+
     add_custom_command(
         OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/net.exe"
         COMMAND "${CMAKE_COMMAND}" -E env ${OPENWATCOM_ENV}
@@ -77,15 +106,12 @@ if(MARS_NWE_BUILD_DOSUTILS)
                 -0
                 -k32768
                 -fe="${CMAKE_CURRENT_BINARY_DIR}/net.exe"
-                ${DOSUTILS_C_SOURCES}
+                ${DOSUTILS_OBJECTS}
                 "${CMAKE_CURRENT_BINARY_DIR}/kern.obj"
         DEPENDS
-                ${DOSUTILS_C_SOURCES}
+                ${DOSUTILS_OBJECTS}
                 "${CMAKE_CURRENT_BINARY_DIR}/kern.obj"
-                net.h
-                kern.h
-                nwcrypt.h
-        WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
+        WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}"
         VERBATIM
     )
 
diff --git a/kern.asm b/doc/kern.asm
similarity index 100%
rename from kern.asm
rename to doc/kern.asm
diff --git a/makefile.bcc b/doc/makefile.bcc
similarity index 100%
rename from makefile.bcc
rename to doc/makefile.bcc