diff --git a/astro/boinc-setiathome-enhanced/Makefile b/astro/boinc-setiathome-enhanced/Makefile
index 2e00f932ae33..8f72030e24b6 100644
--- a/astro/boinc-setiathome-enhanced/Makefile
+++ b/astro/boinc-setiathome-enhanced/Makefile
@@ -60,10 +60,14 @@ PLIST_SUB+=	X11="@comment "
 CFLAGS+=	-mtune=native
 .endif
 
+.if !empty(MACHINE_CPU:Maltivec)
+CONFIGURE_ARGS+=	--enable-altivec
+.endif
+
 CONFIGURE_ENV+=	BOINCDIR="${NONEXISTENT}"
 
 CONFIGURE_ARGS+=	--disable-static-client --disable-server \
-			--disable-altivec --disable-tests \
+			--disable-tests \
 			--with-boinc-platform=${ARCH}-portbld-freebsd
 
 SETI_SITE=	setiathome.berkeley.edu
diff --git a/astro/boinc-setiathome-enhanced/files/patch-client__Makefile.am b/astro/boinc-setiathome-enhanced/files/patch-client__Makefile.am
new file mode 100644
index 000000000000..8bf2690d6c2b
--- /dev/null
+++ b/astro/boinc-setiathome-enhanced/files/patch-client__Makefile.am
@@ -0,0 +1,11 @@
+--- client/Makefile.am.orig	2009-09-23 01:50:50.000000000 +0200
++++ client/Makefile.am	2011-12-04 17:19:18.000000000 +0100
+@@ -165,7 +165,7 @@
+ seti_boinc-analyzeFuncs_altivec.o:  vector/analyzeFuncs_altivec.cpp
+ 	if $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
+ 	$(CPPFLAGS) $(seti_boinc_CXXFLAGS) $(CXXFLAGS) -DUSE_ALTIVEC \
+-	-MT $@ -MD -MP -MF "$(DEPDIR)/$*.Tpo" -faltivec \
++	-MT $@ -MD -MP -MF "$(DEPDIR)/$*.Tpo" -maltivec -mabi=altivec \
+ 	-c -o $@ $<; then mv -f "$(DEPDIR)/$*.Tpo" "$(DEPDIR)/$*.Po"; \
+ 	else rm -f "$(DEPDIR)/$*.Tpo"; exit 1; fi
+ seti_boinc-analyzeFuncs_vector.o:  vector/analyzeFuncs_vector.cpp