problem with UFL function "sign"

In a python shell, when I type: from dolfin import * Expression("sign(x[0])")

I get: Calling DOLFIN just-in-time (JIT) compiler, this may take some time. In instant.recompile: The module did not compile with command 'make VERBOSE=1', see '/Users/me/.instant/error/dolfin_compile_code_f7180e2b80426dedcd6dd83d6443b7eb/compile.log' Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/Applications/FEniCS.app/Contents/Resources/lib/python2.7/site-packages/dolfin/functions/expression.py", line 582, in new [generic_function_members]) File "/Applications/FEniCS.app/Contents/Resources/lib/python2.7/site-packages/dolfin/compilemodules/expressions.py", line 217, in compile_expressions additional_declarations)) File "/Applications/FEniCS.app/Contents/Resources/lib/python2.7/site-packages/dolfin/compilemodules/expressions.py", line 142, in compile_expression_code code, additional_declarations=additional_declarations) File "/Applications/FEniCS.app/Contents/Resources/lib/python2.7/site-packages/dolfin/compilemodules/jit.py", line 64, in mpi_jit return local_jit(args, kwargs) File "/Applications/FEniCS.app/Contents/Resources/lib/python2.7/site-packages/dolfin/compilemodules/compilemodule.py", line 448, in compile_extension_module *instant_kwargs) File "/Applications/FEniCS.app/Contents/Resources/lib/python2.7/site-packages/instant/build.py", line 542, in build_module recompile(modulename, module_path, new_compilation_checksum, build_system) File "/Applications/FEniCS.app/Contents/Resources/lib/python2.7/site-packages/instant/build.py", line 151, in recompile instant_error(msg % (cmd, compile_log_filename_dest)) File "/Applications/FEniCS.app/Contents/Resources/lib/python2.7/site-packages/instant/output.py", line 57, in instant_error raise RuntimeError(text) RuntimeError: In instant.recompile: The module did not compile with command 'make VERBOSE=1', see '/Users/me/.instant/error/dolfin_compile_code_f7180e2b80426dedcd6dd83d6443b7eb/compile.log'

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