diff -urN osmose.old/Makefile osmose/Makefile
--- osmose.old/Makefile	Thu Jul 28 14:32:07 2005
+++ osmose/Makefile	Thu Jul 28 14:36:13 2005
@@ -14,6 +14,8 @@
 MAINTAINER=	alejandro@varnet.biz
 COMMENT=	Sega Master System emulator
 
+BUILD_DEPENDS=	nasm:${PORTSDIR}/devel/nasm
+
 ONLY_FOR_ARCHS=	i386
 
 USE_ZIP=	yes