[FIX] [WIP] Added MPI linking to exprtk_wrapper.

src/CMakeLists.txt

@@ -66,6 +66,9 @@ IF("${BUILD_LIB}" STREQUAL "yes")
         PRIVATE
         ${Boost_LIBRARIES}
         ${PETSC_LIBRARIES}
+        ${MPI_TARGETS}
+        ${MPI_C_LIBRARIES}
+        ${MPI_CXX_LIBRARIES}
     )
 
     IF(NOT OpenBLAS_LIBRARIES)