I've reinstalled MPICH, and did a clean build of p4est, petsc and dealii, 
this problem still exists. At the linking stage of building dealii, I got 
warnings:

[526/579] Linking CXX shared library lib/libdeal_II.9.0.0-pre.dylib        
                                                   
ld: warning: could not create compact unwind for _dgehrd_: stack subq 
instruction is too different from dwarf stack size      
ld: warning: could not create compact unwind for _dhseqr_: stack subq 
instruction is too different from dwarf stack size      
ld: warning: could not create compact unwind for _sgehrd_: stack subq 
instruction is too different from dwarf stack size      
ld: warning: could not create compact unwind for _shseqr_: stack subq 
instruction is too different from dwarf stack size      
ld: warning: could not create compact unwind for _dormlq_: stack subq 
instruction is too different from dwarf stack size      
ld: warning: could not create compact unwind for _dormql_: stack subq 
instruction is too different from dwarf stack size      
ld: warning: could not create compact unwind for _dormqr_: stack subq 
instruction is too different from dwarf stack size      
ld: warning: could not create compact unwind for _sormlq_: stack subq 
instruction is too different from dwarf stack size      
ld: warning: could not create compact unwind for _sormql_: stack subq 
instruction is too different from dwarf stack size      
ld: warning: could not create compact unwind for _sormqr_: stack subq 
instruction is too different from dwarf stack size

I am not sure if this is related. Anyone has a clue?

Thanks
Jie

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