diff --git a/NTMakefile b/NTMakefile
index 03839743..6712a8b2 100644
--- a/NTMakefile
+++ b/NTMakefile
@@ -1,8 +1,8 @@
 CC = cl /TC /c /nologo
 LD = link /nologo
 
-!if [where d3d9.h >nul 2>nul]
-!if [for /f "delims=" %P in ('where d3d9.h 2^>nul') do @echo DX9_FLAGS = /DMW_DIRECT3D9 /I"%~dpP">d3d9flags.mk]
+!if [where /R "%DXSDK_DIR%\\Include" d3d9.h >nul 2>nul]
+!if [for /f "delims=" %P in ('where /R "%DXSDK_DIR%\\Include" d3d9.h 2^>nul') do @echo DX9_FLAGS = /DMW_DIRECT3D9 /I"%~dpP">d3d9flags.mk]
 !endif
 !else
 !if [echo DX9_FLAGS =>d3d9flags.mk]
diff --git a/WatMakefile b/WatMakefile
index 07029477..04a48b8e 100644
--- a/WatMakefile
+++ b/WatMakefile
@@ -1,20 +1,7 @@
 CC = wcc386 -bt=nt -q
 LD = wlink option quiet
 
-!if [where d3d9.h >nul 2>nul]
-!if [for /f "delims=" %P in ('where d3d9.h 2^>nul') do @echo DX9_FLAGS = /DMW_DIRECT3D9 /I"%~dpP">d3d9flags.mk]
-!endif
-!else
-!if [echo DX9_FLAGS =>d3d9flags.mk]
-!endif
-!endif
-!if exist("d3d9flags.mk")
-!include "d3d9flags.mk"
-!else
-DX9_FLAGS =
-!endif
-
-MW_CFLAGS = -bd -i=include -i=external/libz/include -d_MILSKO -d_MILSKO_BUILD -dUSE_GDI -dUSE_STB_IMAGE -dSTBI_NO_SIMD -dUSE_GDI_TEXT -dMW_OPENGL $(DX9_FLAGS)
+MW_CFLAGS = -bd -i=include -i=external/libz/include -d_MILSKO -d_MILSKO_BUILD -dUSE_GDI -dUSE_STB_IMAGE -dSTBI_NO_SIMD -dUSE_GDI_TEXT -dMW_OPENGL 
 MW_LDFLAGS = system nt_dll
 EXE_CFLAGS = -i=include
 EXE_LDFLAGS = system nt
@@ -121,7 +108,6 @@ clean: .SYMBOLIC
 	%erase src/widget/window.obj
 	%erase src/Mw.dll
 	%erase src/Mw.lib
-	%erase d3d9flags.mk
 	%erase examples/basic/box.obj
 	%erase examples/basic/calculator.obj
 	%erase examples/basic/checkbox.obj
diff --git a/tools/genmk.pl b/tools/genmk.pl
index e8c76959..ee4822ab 100755
--- a/tools/genmk.pl
+++ b/tools/genmk.pl
@@ -44,8 +44,8 @@ sub cobjs {
 
 sub d3d9_detect_block {
     return <<'EOF';
-!if [where d3d9.h >nul 2>nul]
-!if [for /f "delims=" %P in ('where d3d9.h 2^>nul') do @echo DX9_FLAGS = /DMW_DIRECT3D9 /I"%~dpP">d3d9flags.mk]
+!if [where /R "%DXSDK_DIR%\\Include" d3d9.h >nul 2>nul]
+!if [for /f "delims=" %P in ('where /R "%DXSDK_DIR%\\Include" d3d9.h 2^>nul') do @echo DX9_FLAGS = /DMW_DIRECT3D9 /I"%~dpP">d3d9flags.mk]
 !endif
 !else
 !if [echo DX9_FLAGS =>d3d9flags.mk]
@@ -131,9 +131,6 @@ sub generate {
         $prefobj  = "file ";
         $needlibs = "${lib}clib3r.lib";
         $c_dllout = "option implib=src${dir}Mw.lib";
-
-        $d3d9_flags = "\$(DX9_FLAGS)";
-        $d3d9_block = d3d9_detect_block();
     }
 
     open(OUT, ">", $output);