On Tue, 15 Oct 2019, Matthew Agius via petsc-users wrote: > Dear PETSC users, > > This is my first attempt at PETSC package. > > First step, I think I have installed PETSC, well at least no errors. > Now I am trying to run a simple makefile as suggested in the manual > I am confused about undeclared variables in the example makefiles that I am > coming across; variables such as: > > > ${CLINKER} ${PETSC_LIB} ${PETSC_SYS_LIB} ${PETSC_VEC_LI B} > > ${PETSC_MAT_LIB} ${PETSC_DM_LIB} ${PETSC_KSP_LIB} ${PETSC_SNES_LIB} > > or ${PETSC_TS_LIB}. > > Are these environmental variables?
nope - they are declared in other makefiles - and picked up with: include ${PETSC_DIR}/lib/petsc/conf/variables include ${PETSC_DIR}/lib/petsc/conf/rules > So far I only have PETSC_DIR declared in my environment. > Do I have to declare each one? What are they? > > The error I am actually getting is > > > error #6404: This name does not have a type, and must have an explicit > > type. [PETSC_NULL_CHARACTER] > > This is probably due to a missing Include library file in the compilation. > Any hint which one it is? Presumably this is not a petsc example with petsc makefile. Please compare the output of compiling your code/makefile - with a petsc example/makefile and check for differences. i.e cd src/ksp/ksp/examples/tutorials make ex2 Satish