Protobuf: 'readlink' not declared in this scope

[sbPhys]

I'm trying to install protobuf using Cygwin. I ran ./autogen.sh, no problems. I ran ./configure, no problems. Then I ran make. It runs fine until it gets to command_line_interface.cc, at which point I get:

google/protobuf/compiler/command_line_interface.cc: In function ‘bool google::protobuf::compiler::{anonymous}::GetProtocAbsolutePath(std::string*)’:
google/protobuf/compiler/command_line_interface.cc:220:56: error: ‘readlink’ was not declared in this scope
int len = readlink("/proc/self/exe", buffer, PATH_MAX);

As far as I can tell, I have all the tools I need and I followed the instructions to the letter. Please help.

[ghost]

Try to configure with CXXFLAGS=-std=gnu++11.

[jppetersen]

Confirmed this does fix the aforementioned issue:

./configure CXXFLAGS=-std=gnu++11

[dulio]

I got the same issue, fixed, thx

[sigurdm]

I just stumbled into this. Is this really solved? Should configure not be able to figure this out by default?

[Chris-Higgins-CardinalPeak]

Fixed it for me. Tanks.

[abtionlove]

Fixed it for me. Tanks.

How to solve the above problems, can you tell me the specific operation?