Just wanted to pass along a simple fix I had to make to get the
protobuf package to
build on cygwin.  I had to make

 const':
./google/protobuf/descriptor.h:1152: error:
`google::protobuf::internal::Mutex*google::protobuf::DescriptorPool::mutex_'
 is private


this member field public.  It all built ok after doing this.  (I also
had to move the dir to C:
as it had a link error due to being under C:/Documents and Settings.)

Here is the error message excerpt I got:


libtool: compile:  g++ -DHAVE_CONFIG_H -I. -I.. -Wall -Wwrite-strings -
Woverloaded-virtual -Wno-sign-compare -O2 -g -DND
EBUG -MT structurally_valid.lo -MD -MP -MF .deps/
structurally_valid.Tpo -c google/protobuf/stubs/structurally_valid.cc
-DDLL_EXPORT -DPIC -o .libs/structurally_valid.o
libtool: compile:  g++ -DHAVE_CONFIG_H -I. -I.. -Wall -Wwrite-strings -
Woverloaded-virtual -Wno-sign-compare -O2 -g -DND
EBUG -MT structurally_valid.lo -MD -MP -MF .deps/
structurally_valid.Tpo -c google/protobuf/stubs/structurally_valid.cc
-
o structurally_valid.o >/dev/null 2>&1
mv -f .deps/structurally_valid.Tpo .deps/structurally_valid.Plo
/bin/sh ../libtool  --tag=CXX   --mode=compile g++ -DHAVE_CONFIG_H -I.
-I..     -Wall -Wwrite-strings -Woverloaded-virtu
al -Wno-sign-compare -O2 -g -DNDEBUG -MT descriptor.lo -MD -MP -
MF .deps/descriptor.Tpo -c -o descriptor.lo `test -f 'go
ogle/protobuf/descriptor.cc' || echo './'`google/protobuf/
descriptor.cc
libtool: compile:  g++ -DHAVE_CONFIG_H -I. -I.. -Wall -Wwrite-strings -
Woverloaded-virtual -Wno-sign-compare -O2 -g -DND
EBUG -MT descriptor.lo -MD -MP -MF .deps/descriptor.Tpo -c google/
protobuf/descriptor.cc  -DDLL_EXPORT -DPIC -o .libs/de
scriptor.o
google/protobuf/descriptor.cc: In member function `virtual const
google::protobuf::FieldDescriptor* google::protobuf::De
scriptorBuilder::OptionInterpreter::AggregateOptionFinder::FindExtension(google::protobuf::Message*,
const std::string&)
 const':
./google/protobuf/descriptor.h:1152: error:
`google::protobuf::internal::Mutex*google::protobuf::DescriptorPool::mutex_'
 is private
google/protobuf/descriptor.cc:4341: error: within this context
./google/protobuf/descriptor.h:1152: error:
`google::protobuf::internal::Mutex*google::protobuf::DescriptorPool::mutex_'
 is private
google/protobuf/descriptor.cc:4342: error: within this context
make[2]: *** [descriptor.lo] Error 1
make[2]: Leaving directory `/cygdrive/c/Documents and Settings/Jim/My
Documents/java/protobuf-2.4.0a/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/cygdrive/c/Documents and Settings/Jim/My
Documents/java/protobuf-2.4.0a'
make: *** [all] Error 2

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