diff -urN /usr/ports/graphics/darktable.old/Makefile /usr/ports/graphics/darktable/Makefile
--- /usr/ports/graphics/darktable.old/Makefile	2015-03-09 10:02:27.000000000 +0100
+++ /usr/ports/graphics/darktable/Makefile	2015-03-10 01:06:02.317578000 +0100
@@ -3,6 +3,7 @@
 
 PORTNAME=	darktable
 PORTVERSION=	1.6.3
+PORTREVISION=	1
 CATEGORIES=	graphics
 MASTER_SITES=	https://github.com/darktable-org/${PORTNAME}/releases/download/release-${PORTVERSION}/
 
@@ -103,6 +104,10 @@
 STRIP=
 .endif
 
+.if ! ${MACHINE_CPU:Msse2}
+EXTRA_PATCHES+=	${FILESDIR}/extra-patch-sse2
+.endif
+
 .if ! ${PORT_OPTIONS:MDOCS}
 post-install:
 	${RM} ${STAGEDIR}${DOCSDIR}/AUTHORS
diff -urN /usr/ports/graphics/darktable.old/files/extra-patch-sse2 /usr/ports/graphics/darktable/files/extra-patch-sse2
--- /usr/ports/graphics/darktable.old/files/extra-patch-sse2	1970-01-01 01:00:00.000000000 +0100
+++ /usr/ports/graphics/darktable/files/extra-patch-sse2	2015-03-10 00:23:42.225237000 +0100
@@ -0,0 +1,38 @@
+--- ./src/CMakeLists.txt.orig	2015-02-12 21:57:26.000000000 +0100
++++ ./src/CMakeLists.txt	2015-02-12 21:58:18.000000000 +0100
+@@ -385,7 +385,7 @@
+ 
+ if(NOT CUSTOM_CFLAGS)
+   #we MUST always specify our requred instruction set, native might not detect it
+-  set(DT_REQ_INSTRUCTIONS "-msse3")
++  set(DT_REQ_INSTRUCTIONS "-msse2")
+ 
+   if(NOT BINARY_PACKAGE_BUILD AND (NOT APPLE OR CMAKE_C_COMPILER_ID STREQUAL "Clang"))
+     MESSAGE("-- Checking for -march=native support")
+--- ./src/common/darktable.c.orig	2015-02-12 22:00:14.000000000 +0100
++++ ./src/common/darktable.c	2015-02-12 22:01:30.000000000 +0100
+@@ -397,19 +397,19 @@
+ #define __has_builtin(x) false
+ #endif
+ 
+-#ifndef __SSE3__
++#ifndef __SSE2__
+ #error "Unfortunately we depend on SSE3 instructions at this time."
+ #error "Please contribute a backport patch (or buy a newer processor)."
+ #else
+-  int sse3_supported = 0;
++  int sse2_supported = 0;
+ 
+ #if(__GNUC_PREREQ(4, 8) || __has_builtin(__builtin_cpu_supports))
+   // NOTE: _may_i_use_cpu_feature() looks better, but only avaliable in ICC
+-  sse3_supported = __builtin_cpu_supports("sse3");
++  sse2_supported = __builtin_cpu_supports("sse2");
+ #else
+-  sse3_supported = dt_detect_cpu_features() & CPU_FLAG_SSE3;
++  sse2_supported = dt_detect_cpu_features() & CPU_FLAG_SSE2;
+ #endif
+-  if(!sse3_supported)
++  if(!sse2_supported)
+   {
+     fprintf(stderr, "[dt_init] unfortunately we depend on SSE3 instructions at this time.\n");
+     fprintf(stderr, "[dt_init] please contribute a backport patch (or buy a newer processor).\n");