Index: head/misc/py-xgboost/Makefile
===================================================================
--- head/misc/py-xgboost/Makefile	(revision 550898)
+++ head/misc/py-xgboost/Makefile	(revision 550899)
@@ -1,40 +1,46 @@
 # $FreeBSD$
 
 PORTNAME=	xgboost
 DISTVERSIONPREFIX=	v
 DISTVERSION=	1.2.0
 CATEGORIES=	misc # machine-learning
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
 
 MAINTAINER=	yuri@FreeBSD.org
 COMMENT=	Scalable, Portable and Distributed Gradient Boosting (GBDT, GBRT, GBM)
 
 LICENSE=	APACHE20
 LICENSE_FILE=	${WRKSRC}/../LICENSE
 
 BUILD_DEPENDS=	cmake:devel/cmake
 LIB_DEPENDS=	libdmlc.so:devel/dmlc-core \
 		librabit.so:misc/xgboost
 RUN_DEPENDS=	${PYNUMPY} \
 		${PYTHON_PKGNAMEPREFIX}scipy>0:science/py-scipy@${PY_FLAVOR}
 
 USES=		python:3.5+ localbase:ldflags
 USE_GITHUB=	yes
 GH_ACCOUNT=	dmlc
 USE_PYTHON=	distutils autoplist
 USE_LDCONFIG=	yes
 GH_TUPLE=	\
 		dmlc:rabit:4fb34a008db6437c84d1877635064e09a55c8553:dmlc_rabit/../rabit
 
 WRKSRC_SUBDIR=	python-package
 
 MAKE_ENV+=	FREEBSD_LIBRARY_PATH=${LOCALBASE}/lib
 
 LDFLAGS+=	-lexecinfo
 
 POST_PLIST=	fix-plist
 
+.include <bsd.port.pre.mk>
+
+.if ${OSVERSION} < 1300060
+BROKEN_i386=	undefined symbol: __atomic_load (on 11 and 12, but not on 13)
+.endif
+
 fix-plist: # https://github.com/dmlc/xgboost/issues/5705
 	@${REINPLACE_CMD} 's|/libxgboost.so$$|/xgboost/lib/libxgboost.so|' ${TMPPLIST}
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>