runtime error with protobuf 2.6.x

[tumluliu]

I am on OS X 10.10.3, Python 2.7 (Homebrew version). I installed the deps via homebrew and pip, then the 2.6 version of imposm. But it seems that imposm requires 2.5 version of protobuf because I caught a runtime error:

Traceback (most recent call last):
File "osm_parser.py", line 579, in
p.parse('/Users/user/Research/data/OSM/munich.osm.pbf')
File "/Library/Python/2.7/site-packages/imposm/parser/simple.py", line 62, in parse
return self.parse_pbf_file(filename)
File "/Library/Python/2.7/site-packages/imposm/parser/simple.py", line 72, in parse_pbf_file
from imposm.parser.pbf.multiproc import PBFMultiProcParser
File "/Library/Python/2.7/site-packages/imposm/parser/pbf/multiproc.py", line 17, in
from imposm.parser.pbf.parser import PBFFile, PBFParser
File "/Library/Python/2.7/site-packages/imposm/parser/pbf/parser.py", line 23, in
from imposm.parser.pbf import OSMPBF
ImportError: dlopen(/Library/Python/2.7/site-packages/imposm/parser/pbf/OSMPBF.so, 2): Library not loaded: /usr/local/lib/libprotobuf.8.dylib
Referenced from: /Library/Python/2.7/site-packages/imposm/parser/pbf/OSMPBF.so
Reason: image not found

The latest protobuf in homebrew is 2.6.1, and the lib file is libprotobuf.9.dylib. I tried making a symbolic link to libprotobuf.9.dylib by doing

$ ln /usr/local/lib/libprotobuf.9.dylib /usr/local/lib/libprotobuf.8.dylib

But no luck and got a new error:

Traceback (most recent call last):
File "osm_parser.py", line 579, in
p.parse('/Users/user/Research/data/OSM/munich.osm.pbf')
File "/Library/Python/2.7/site-packages/imposm/parser/simple.py", line 62, in parse
return self.parse_pbf_file(filename)
File "/Library/Python/2.7/site-packages/imposm/parser/simple.py", line 72, in parse_pbf_file
from imposm.parser.pbf.multiproc import PBFMultiProcParser
File "/Library/Python/2.7/site-packages/imposm/parser/pbf/multiproc.py", line 17, in
from imposm.parser.pbf.parser import PBFFile, PBFParser
File "/Library/Python/2.7/site-packages/imposm/parser/pbf/parser.py", line 23, in
from imposm.parser.pbf import OSMPBF
ImportError: dlopen(/Library/Python/2.7/site-packages/imposm/parser/pbf/OSMPBF.so, 2): Symbol not found: __ZN6google8protobuf8internal12kEmptyStringE
Referenced from: /Library/Python/2.7/site-packages/imposm/parser/pbf/OSMPBF.so
Expected in: /usr/local/lib/libprotobuf.8.dylib
in /Library/Python/2.7/site-packages/imposm/parser/pbf/OSMPBF.so

So I installed the protobuf at its specific version of 2.5.0 via homebrew:

$ brew unlink protobuf
$ brew install /homebrew/versions/protobuf250

And the problem is solved for the moment. Does imposm really require protobuf exactly at the 2.5 version?