go get fails

[lattice0]

Hi, I'm doing go get gopkg.in/zeromq/goczmq.v4 and I get the following:

# pkg-config --cflags libczmq libzmq libsodium
Package libczmq was not found in the pkg-config search path.
Perhaps you should add the directory containing `libczmq.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libczmq' found
Package libsodium was not found in the pkg-config search path.
Perhaps you should add the directory containing `libsodium.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libsodium' found
pkg-config: exit status 1

But when I do apt-get install libzmq-dev I see that the package already exists. Should this fail and I fix it manually or this is a real issue? Sorry if not, but I think it should be automatic.

[bluca]

It's complaining about libczmq, not libzmq
If you are on Ubuntu 16.04 or greater or Debian Stretch just apt-get install libczmq-dev

[lattice0]

@bluca it worked, but what about libsodium? It's still complaining about that. Also, could you tell me why they're necessary? And is this for development only? I'd like to understand what's going on. Because I installed go get github.com/alecthomas/gozmq and it didn't ask for these, but I prefer to stick with the official library

[lattice0]

Ok, I randomly tried sudo apt-get install libsodium-dev and it worked, but now I get:

go get github.com/zeromq/goczmq
# github.com/zeromq/goczmq
could not determine kind of name for C.ZMQ_GATHER
could not determine kind of name for C.ZMQ_SCATTER

this one I have no idea what to do :(

[bluca]

I assume that's because this repository needs the DRAFT APIs, but the builds in Debian/Ubuntu don't ship with them since they are not stable.
You can uninstall libczmq-dev and libczmq4 and build manually czmq from the github repo and install it, and it should work

[bluca]

You can also add the repository that builds packages with DRAFT APIs enabled from our OBS page:

https://build.opensuse.org/project/show/home:zeromq:git-draft

For example for Ubuntu 16.04 you want to add to /etc/apt/sources.list:

deb http://download.opensuse.org/repositories/home:/zeromq:/git-stable/xUbuntu_16.04/ ./

[taotetek]

@bluca @LucasZanella that's correct - current v4 needs the DRAFT APIs enabled. Go unfortunately doesn't have support for conditional compilation via macros. goczmq.v3 will work without draft apis enabled.

There may be a way to make this more pleasant with go build flags - go doesn't seem to have very much in the way of conditional compilation, and I wanted to start adding support for the draft socket types. Open to better ways of handling this but for now if you want to use the standard ubuntu packages, v3 should work for you.

[taotetek]

@bluca @LucasZanella I moved things that depend on a czmq built with DRAFT enabled to their own files, and guarded them with a build flag of "draft".

go get / go build will now default to not requiring a DRAFT enabled CZMQ. go build -tag=draft will build with the new experimental features.

[holisticode]

I am having the same issue. Unfortunately I am on manjaro linux, and I could not find any package libczmq-dev on arch linux / manjaro, nor any libczmq. It looks like this should be already available in the main zeromq package.

So go get fails for me. Any suggestion?

[taotetek]

libczmq is definitely a different library than libzmq. CZMQ is a C api on top of libzmq. If the "zeromq" package on manjaro only includes libzmq that won't work. You'll need this: https://github.com/zeromq/czmq As a possible alternative you could use pebbe/zmq4. It's a Go library written directly on top of libzmq, and will have no dependency on czmq - you can find it here: https://github.com/pebbe/zmq4

…

On Wed, Apr 8, 2020 at 7:59 PM holisticode ***@***.***> wrote: I am having the same issue. Unfortunately I am on manjaro linux, and I could not find any package libczmq-dev on arch linux / manjaro, nor any libczmq. It looks like this should be already available in the main zeromq package. So go get fails for me. Any suggestion? — You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub <#228 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AABSO7ZTNB43AYJKPNZONVDRLUFUNANCNFSM4C7FCGXQ> .

[holisticode]

Thanks @taotetek,

what I do not understand though is that I have this entry in the go.mod file:

 github.com/zeromq/goczmq v4.1.0+incompatible

which seems to run

# pkg-config --cflags  -- libczmq libzmq libsodium
Package libczmq was not found in the pkg-config search path.
Perhaps you should add the directory containing `libczmq.pc'
to the PKG_CONFIG_PATH environment variable
Package 'libczmq', required by 'virtual:world', not found
pkg-config: exit status 1

This worries me. This should be some generic mod file which should be working for all platform. Why is pkg-config trying to load packages which are not available everywhere? I don't even know where this pkg-config comes from, and frankly, I am not understanding...

[bluca]

it's czmq, not libczmq

[holisticode]

Oh, yes, that worked!

yay -S czmq installed the missing dependencies, and my binary compiled.
Thank you!