--- b/devel/Makefile	
+++ b/devel/Makefile	
@@ -4896,6 +4896,7 @@ 
     SUBDIR += py-pycadf
     SUBDIR += py-pycalendar
     SUBDIR += py-pycallgraph
+    SUBDIR += py-pycapnp
     SUBDIR += py-pycapsicum
     SUBDIR += py-pycerberus
     SUBDIR += py-pycmd
--- /dev/null	
+++ b/devel/py-pycapnp/Makefile	
@@ -0,0 +1,23 @@ 
+PORTNAME=	pycapnp
+PORTVERSION=	1.1.0
+DISTVERSIONPREFIX=	v
+CATEGORIES=	devel python
+PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
+
+MAINTAINER=	sobomax@FreeBSD.org
+COMMENT=	Python bindings of the Cap'n Proto library
+
+LICENSE=	BSD2CLAUSE
+
+BUILD_DEPENDS=	cmake:devel/cmake \
+		${PYTHON_PKGNAMEPREFIX}pkgconfig>0:devel/py-pkgconfig@${PY_FLAVOR} \
+		${PYTHON_PKGNAMEPREFIX}cython>0:lang/cython@${PY_FLAVOR}
+LIB_DEPENDS=	libcapnp.so:devel/capnproto
+
+USES=		python:3.7+
+USE_GITHUB=	yes
+USE_PYTHON=	autoplist distutils
+
+GH_ACCOUNT=	capnproto
+
+.include <bsd.port.mk>
--- /dev/null	
+++ b/devel/py-pycapnp/distinfo	
@@ -0,0 +1,3 @@ 
+TIMESTAMP = 1629252062
+SHA256 (capnproto-pycapnp-v1.1.0_GH0.tar.gz) = d0a1499b1effb7b7f1ccdee0df13ae117218976ee2778bffc3b4de6dde95494e
+SIZE (capnproto-pycapnp-v1.1.0_GH0.tar.gz) = 122066
--- /dev/null	
+++ b/devel/py-pycapnp/pkg-descr	
@@ -0,0 +1,17 @@ 
+This is a python wrapping of the C++ implementation of the Cap'n Proto
+library. Here is a short description, quoted from its docs:
+
+  Cap'n Proto is an insanely fast data interchange form and capability-based
+  RPC system. Think JSON, except binary. Or think Protocol Buffers, except
+  faster. In fact, in benchmarks, Cap'n Proto is INFINITY TIMES faster than
+  Protocol Buffers.
+
+Since the python library is just a thin wrapping of the C++ library, it
+inherits a lot of what makes Cap'n Proto fast. In some simplistic benchmks
+(available in the benchmark directory of the repo), pycapnp has proven to be
+decently faster than Protocol Buffers (both pure python and C++
+implementations). Also, the python capnp library can load Cap'n Proto schema
+files directly, without the need for a seperate compile step like with Protocol
+Buffers or Thrift. pycapnp is available on github and pypi.
+
+WWW: http://capnproto.github.io/pycapnp/
--- b/emulators/virtualbox-ose/Makefile	
+++ b/emulators/virtualbox-ose/Makefile	
@@ -213,7 +213,7 @@ KMK_FLAGS+=	-j${MAKE_JOBS_NUMBER}
 # llvm10 in FreeBSD before r364284 miscompiles virtualbox 6.1 causing errors.
 # force llvm11 from ports
 .if ${OPSYS} == FreeBSD && ${OSVERSION} < 1300109
-BUILD_DEPENDS+=	clang11:devel/llvm${VBOX_LLVM_VER}
+BUILD_DEPENDS+=	clang${VBOX_LLVM_VER}:devel/llvm${VBOX_LLVM_VER}
 CC=		${LOCALBASE}/bin/clang${VBOX_LLVM_VER}
 CXX=		${LOCALBASE}/bin/clang++${VBOX_LLVM_VER}
 VBOX_LLVM_VER?=	11