Index: science/lammps/Makefile
===================================================================
--- science/lammps/Makefile
+++ science/lammps/Makefile
@@ -31,9 +31,9 @@
 
 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
 
 FFMPEG_BUILD_DEPENDS=	ffmpeg:multimedia/ffmpeg