Dear all, I am trying to build Nektar++4.4.1 with third party PETSc and Arpack. The third party version of PETSc compiles, but it failed all of the tests. I executed the test command and it returned seg fault (seg fault for first 4 tests and exception for the rest). However, if I removed NEKTAR_USE_PETSC and THIRDPARTY_BUILD_PETSC, the tests can be passed. The command I used looks like the following: CC=mpiicc CXX=mpiicpc FC=mpiifort cmake\ -DNEKTAR_USE_MKL=ON \ -DNEKTAR_USE_PETSC=ON \ -DNEKTAR_USE_MPI=ON \ -DTHIRDPARTY_BUILD_PETSC=ON .. The test log is attached in this email. Meanwhile, may I know if Arpack can be supported with third party build? The cmake/ThirdPartyArpack.cmake is more like a FindArpack.cmake script. Many thanks in advance! Best Regards, Ziji