Index: emulators/dgen-sdl/Makefile
===================================================================
--- emulators/dgen-sdl/Makefile	(revision 443799)
+++ emulators/dgen-sdl/Makefile	(working copy)
@@ -29,4 +29,10 @@
 CONFIGURE_ARGS+=	--disable-asm
 .endif
 
+post-patch:
+	@${REINPLACE_CMD} -e 's|	@NASM@ -f @NASM_FORMAT@ -o $$@ -- $$<|	@NASM@ -f @NASM_FORMAT@ -o $$@ $$<|g' \
+		${WRKSRC}/Makefile.in \
+		${WRKSRC}/mz80/Makefile.in \
+		${WRKSRC}/star/Makefile.in
+
 .include <bsd.port.post.mk>