diff --git a/net/sems/Makefile b/net/sems/Makefile
index f352159b369e..f1860f7c1c30 100644
--- a/net/sems/Makefile
+++ b/net/sems/Makefile
@@ -21,7 +21,7 @@ LIB_DEPENDS=	libopus.so:audio/opus \
 		libspeex.so:audio/speex \
 		libspandsp.so:comms/spandsp
 
-USES=		cmake python:2.7,run shebangfix
+USES=		cmake compiler:c++11-lang python:2.7,run shebangfix
 SHEBANG_GLOB=	sems-*
 
 USE_GITHUB=	yes
diff --git a/net/sems/files/patch-core_plug-in_isac_libisac_typedefs.h b/net/sems/files/patch-core_plug-in_isac_libisac_typedefs.h
new file mode 100644
index 000000000000..5a89dbbac0be
--- /dev/null
+++ b/net/sems/files/patch-core_plug-in_isac_libisac_typedefs.h
@@ -0,0 +1,23 @@
+--- core/plug-in/isac/libisac/typedefs.h.orig	2019-09-18 08:25:08 UTC
++++ core/plug-in/isac/libisac/typedefs.h
+@@ -77,7 +77,19 @@
+ #define WEBRTC_ARCH_32_BITS
+ #define WEBRTC_ARCH_LITTLE_ENDIAN
+ #else
+-#error Please add support for your architecture in typedefs.h
++/* instead of failing, use typical unix defines... */
++#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
++#define WEBRTC_ARCH_LITTLE_ENDIAN
++#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
++#define WEBRTC_ARCH_BIG_ENDIAN
++#else
++#error __BYTE_ORDER__ is not defined
++#endif
++#if defined(__LP64__)
++#define WEBRTC_ARCH_64_BITS
++#else
++#define WEBRTC_ARCH_32_BITS
++#endif
+ #endif
+ 
+ #if defined(__SSE2__) || defined(_MSC_VER)