-lpthread is not declared as a dependency in the libbitcoin/develop package config

In updating and versioning dependencies (gmp, ssl, curl) I found that the libbitcoin build didn't require pthread.

This may have been because all of the query examples have been disabled in the develop branch due to the blockchain work.

So either callers that use it need to reference it or it needs to be added to the pc.

e

-----Original Message-----
From: Libbitcoin [mailto:libbitcoin-bounces@lists.dyne.org] On Behalf Of Amir Taaki
Sent: Tuesday, September 30, 2014 11:50 AM
To: libbitcoin@???
Subject: [Libbitcoin] linker errors with libbitcoin and pkg-config (linux)

I tried to track down in the git history but it's difficult and time
consuming. Any ideas why the pkg-config linking with libbitcoin no
longer works?

$ cat orgwork.cpp
#include <bitcoin/bitcoin.hpp>

bc::hash_number sum_difficulty()
{
    bc::hash_number total_work = 0;
    return total_work;
}

int main()
{
    bc::hash_number orphan_work = 0;
    orphan_work += bc::block_work(486604799);
    bc::hash_number main_work = sum_difficulty();
    if (orphan_work <= main_work)
        bc::log_debug() << "Fail";
    else
        bc::log_debug() << "Pass";
    return 0;
}

$ g++ orgwork.cpp $(pkg-config --cflags --libs libbitcoin)
/home/rescue/usr/lib/libbitcoin.so: undefined reference to `pthread_create'
/home/rescue/usr/lib/libbitcoin.so: undefined reference to `pthread_detach'
/home/rescue/usr/lib/libbitcoin.so: undefined reference to `pthread_join'
collect2: error: ld returned 1 exit status