Index: science/lammps/Makefile
===================================================================
--- science/lammps/Makefile
+++ science/lammps/Makefile
@@ -20,20 +20,24 @@
 SHEBANG_FILES=	lib/kokkos/bin/nvcc_wrapper
 
 CMAKE_SOURCE_PATH=	${WRKSRC}/cmake
-CMAKE_ARGS=	-DBLA_VENDOR:STRING="OpenBLAS"
+CMAKE_ARGS=	-DBLA_VENDOR:STRING="OpenBLAS" ${CMAKE_ARGS_${CHOSEN_COMPILER_TYPE}}
+CMAKE_ARGS_gcc=	-DCMAKE_DISABLE_FIND_PACKAGE_OpenMP:BOOL=false
 
 OPTIONS_DEFINE=		JPEG PNG GZIP FFMPEG VORONOI LATTE
+OPTIONS_DEFINE_clang=	OPENMP
 OPTIONS_GROUP=		PARALLEL
-OPTIONS_GROUP_PARALLEL=	MPI OPENMP
+OPTIONS_GROUP_PARALLEL=	MPI ${OPTIONS_DEFINE_${CHOSEN_COMPILER_TYPE}}
 OPTIONS_DEFAULT=	MPI OPENMP JPEG PNG GZIP FFMPEG VORONOI LATTE
 PARALLEL_DESC=		Enable parallelizations:
 
 MPI_CMAKE_BOOL=		BUILD_MPI
 MPI_LIB_DEPENDS=	libmpi.so:net/openmpi
+MPI_USES=		compiler:c11
 
 OPENMP_USES=		localbase
 OPENMP_CMAKE_BOOL=	BUILD_OMP
-OPENMP_LIB_DEPENDS=	libomp.so:devel/openmp
+OPENMP_LIB_DEPENDS=	${OPENMP_LIB_DEPENDS_${CHOSEN_COMPILER_TYPE}}
+OPENMP_LIB_DEPENDS_clang=	libomp.so:devel/openmp
 
 FFMPEG_BUILD_DEPENDS=	ffmpeg:multimedia/ffmpeg
 FFMPEG_RUN_DEPENDS=	ffmpeg:multimedia/ffmpeg