/usr/pkgsrc/www/firefox
Makefile:
.if ${MACHINE_ARCH} == x86_64 || ${MACHINE_ARCH} == i386
BUILD_DEPENDS+= nasm-[0-9]*:../../devel/nasm
.endif
mozilla-common.mk:
.if ${MACHINE_ARCH} == "i386" || ${MACHINE_ARCH} == "x86_64"
BUILD_DEPENDS+=     yasm>=1.1:../../devel/yasm
.endif
-- 
Ryosuke