Mark,
PetscTypeCompare got renamed to PetscObjectTypeCompare  in line with the PETSc naming guidelines:
http://petsc.cs.iit.edu/petsc/petsc-dev/rev/3fc8f665421d
The gamg source was part of this update.
Any chance you introduced a new instance of PetscTypeCompare() after that changeset? 
If so, simply replace it with PetscObjectTypeCompare().

Dmitry.

On Mon, Apr 30, 2012 at 1:03 PM, Mark F. Adams <mark.adams@columbia.edu> wrote:
I've built petsc-dev but when I try to make an example I get this:

make ex54
/Users/markadams/Codes/petsc-dev/arch-macosx-gnu-O/bin/mpicc -o ex54.o -c -malign-double -g3 -fno-inline -O0 -I/Users/markadams/Codes/petsc-dev/include -I/Users/markadams/Codes/petsc-dev/arch-macosx-gnu-O/include -D__INSDIR__=src/ksp/ksp/examples/tutorials/ ex54.c
/Users/markadams/Codes/petsc-dev/arch-macosx-gnu-O/bin/mpicc -Wl,-multiply_defined,suppress -Wl,-multiply_defined -Wl,suppress -Wl,-commons,use_dylibs -Wl,-search_paths_first -Wl,-multiply_defined,suppress -Wl,-multiply_defined -Wl,suppress -Wl,-commons,use_dylibs -Wl,-search_paths_first -malign-double -g3 -fno-inline -O0  -o ex54 ex54.o -L/Users/markadams/Codes/petsc-dev/arch-macosx-gnu-O/lib  -lpetsc -ltriangle -lparmetis -lmetis -lHYPRE -lmpichcxx -lstdc++ -lpthread -lflapack -lfblas -lhdf5_fortran -lhdf5 -lhdf5hl_fortran -lhdf5_hl -lz -L/sw/lib/gcc4.6/lib/gcc/i386-apple-darwin10.8.0/4.6.2 -L/sw/lib/gcc4.6/lib -lpmpich -lmpich -lopa -lmpl -lSystem -lgcc_ext.10.5 -ldl -lmpichf90 -lpthread -lgfortran -lgfortran -lquadmath -lm -lm -lmpichcxx -lstdc++ -lpmpich -lmpich -lopa -lmpl -lSystem -lgcc_ext.10.5 -ldl
Undefined symbols:
 "_PetscTypeCompare", referenced from:
     _PCSetUp_GAMG in libpetsc.a(gamg.c.o)
     _PCSetUp_GAMG in libpetsc.a(gamg.c.o)
ld: symbol(s) not found
collect2: ld returned 1 exit status

Any ideas?

Mark