diff --git a/lang/halide/Makefile b/lang/halide/Makefile
index f03e7cf49e2b..155061ebad96 100644
--- a/lang/halide/Makefile
+++ b/lang/halide/Makefile
@@ -12,6 +12,8 @@ COMMENT=	Halide, a language for fast and portable data-parallel computation
 LICENSE=	MIT
 LICENSE_FILE=	${WRKSRC}/LICENSE.txt
 
+BROKEN_riscv64=		fails to build: /usr/include/c++/v1/__config:1141:6: No thread API
+
 BUILD_DEPENDS=	llvm${LLVM_DEFAULT}>0:devel/llvm${LLVM_DEFAULT} # because halide expects LLVMConfig.cmake
 RUN_DEPENDS=	llvm${LLVM_DEFAULT}>0:devel/llvm${LLVM_DEFAULT}
 
@@ -30,6 +32,7 @@ CMAKE_ON=	LLVM_USE_SHARED_LLVM_LIBRARY HALIDE_SHARED_LIBRARY
 CMAKE_OFF=	WITH_PYTHON_BINDINGS WITH_APPS WITH_TUTORIALS WITH_DOCS WITH_TESTS # APPS are demos
 
 OPTIONS_DEFINE=	NATIVE
+OPTIONS_DEFAULT=
 
 NATIVE_DESC=	Build with native optimizations (-march=native)