diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index 177a9b8296..8095f3e500 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -115,6 +115,16 @@ if(ENABLE_KSPACE)
     include_directories(${FFTW3_INCLUDE_DIRS})
     list(APPEND LAMMPS_LINK_LIBS ${FFTW3_LIBRARIES})
   endif()
+  set(PACK_OPTIMIZATION "PACK_ARRAY" CACHE STRING "Optimization for FFT")
+  set_property(CACHE LAMMPS_SIZE_LIMIT PROPERTY STRINGS PACK_ARRAY PACK_POINTER PACK_MEMCPY)
+  add_definitions(-D${PACK_OPTIMIZATION})
+endif()
+
+if(ENABLE_MISC)
+  option(LAMMPS_XDR "include XDR compatibility files for doing particle dumps in XTC format" OFF)
+  if(LAMMPS_XDR)
+    add_definitions(-DLAMMPS_XDR)
+  endif()
 endif()
 
 if(ENABLE_KOKKOS)