Index: head/devel/dmlc-core/Makefile
===================================================================
--- head/devel/dmlc-core/Makefile
+++ head/devel/dmlc-core/Makefile
@@ -4,6 +4,7 @@
 DISTVERSIONPREFIX=	v
 DISTVERSION=	0.3-105
 DISTVERSIONSUFFIX=	-g32d9fe7
+PORTREVISION=	1
 CATEGORIES=	devel
 
 MAINTAINER=	yuri@FreeBSD.org
@@ -11,24 +12,17 @@
 
 LICENSE=	APACHE20
 
-BUILD_DEPENDS=	llvm${LLVM_DEFAULT}>0:devel/llvm${LLVM_DEFAULT}
-
-USES=		cmake
+USES=		compiler:openmp cmake
 USE_GITHUB=	yes
 GH_ACCOUNT=	dmlc
 USE_LDCONFIG=	yes
 
 CMAKE_ON=	BUILD_SHARED_LIBS
 
-# use clang from ports because otherwise OpenMP isn't detected on some systems (ex. 12.0-RELEASE-p9)
-CPP=		clang-cpp${LLVM_DEFAULT}
-CC=		clang${LLVM_DEFAULT}
-CXX=		clang++${LLVM_DEFAULT}
+.include <bsd.port.pre.mk>
 
-.include <bsd.port.options.mk>
-
-.if ${LLVM_DEFAULT:S,-devel,990,} >= 90
-LLVM_DEFAULT=	80
+.if ${CHOSEN_COMPILER_TYPE} == gcc
+USE_GCC=	yes
 .endif
 
-.include <bsd.port.mk>
+.include <bsd.port.post.mk>
Index: head/devel/dmlc-core/files/patch-CMakeLists.txt
===================================================================
--- head/devel/dmlc-core/files/patch-CMakeLists.txt
+++ head/devel/dmlc-core/files/patch-CMakeLists.txt
@@ -0,0 +1,11 @@
+--- CMakeLists.txt.orig	2019-11-25 13:40:31 UTC
++++ CMakeLists.txt
+@@ -207,7 +207,7 @@ target_include_directories(dmlc PUBLIC
+   $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+   $<INSTALL_INTERFACE:${CMAKE_INSTALL_PREFIX}/include>)
+ target_compile_definitions(dmlc PRIVATE -D_XOPEN_SOURCE=700
+-  -D_POSIX_SOURCE -D_POSIX_C_SOURCE=200809L -D_DARWIN_C_SOURCE
++  -D_DARWIN_C_SOURCE
+   -DDMLC_CORE_USE_CMAKE)
+ # DMLC_CORE_USE_CMAKE macro constant indicates the use of CMake
+