Index: head/lang/spidermonkey185/Makefile
===================================================================
--- head/lang/spidermonkey185/Makefile
+++ head/lang/spidermonkey185/Makefile
@@ -11,6 +11,9 @@
 MAINTAINER=		koobs@FreeBSD.org
 COMMENT=		Standalone JavaScript (1.8.5) interpreter from Mozilla
 
+NOT_FOR_ARCHS=		powerpc powerpc64
+NOT_FOR_ARCHS_REASON=	PowerPC is not supported; use lang/spidermonkey170
+
 BUILD_DEPENDS=		zip:${PORTSDIR}/archivers/zip \
 			autoconf-2.13:${PORTSDIR}/devel/autoconf213
 LIB_DEPENDS=		libnspr4.so:${PORTSDIR}/devel/nspr