<p>I just found out there is a <a href="https://github.com/bitcoinbook/bitcoinbook" rel="nofollow noreferrer">github</a> where the code is updated.</p>

<p>The specific code for <code>addr.cpp</code> is <a href="https://github.com/bitcoinbook/bitcoinbook/blob/develop/code/addr.cpp" rel="nofollow noreferrer">this</a>. </p>

<p>Compilation works with <code>--static</code> e.g. <code>g++ -o addr addr.cpp $(pkg-config --cflags --libs --static libbitcoin)</code>.</p>

CC BY-SA 4.0
2021-05-19T12:12:29.980Z
You can add `-lgmp` when it happens
daparic
CC BY-SA 4.0
2019-09-05T10:09:58.840Z
2019-09-24T12:54:16.370Z
2019-09-24T12:54:16.370Z
bomben
<p>I am trying to compile a code in C++ from the Book "Mastering Bitcoin" by Antonopoulos (page 69). </p>

<p>I am new to all of this, including C++, python, etc. I see it as a way of doing something interesting and alongside it learning a bit about different languages. </p>

<p>The code uses <code>#include &lt;bitcoin/bitcoin.hpp</code> and I already had troubles making this work on my Raspberry Pi. I installed <code>libbitcoin</code> from <a href="https://github.com/libbitcoin/libbitcoin-system" rel="nofollow noreferrer">source</a> and then I had to give the path of <code>libbitcoin.pc</code> to the <code>pkg-config</code> to be able to execute the following command:</p>

<p><code>g++ -o addr addr.cpp $(pkg-config --cflags -- libs libbitcoin)</code></p>

<p>The compiler then gives the following errors:</p>

<pre><code>69_addr.cpp: In function ‘int main()’:
69_addr.cpp:9:3: error: ‘ec_point’ is not a member of ‘bc’
   bc::ec_point public_key = bc::secret_to_public_key(secret);
   ^~
69_addr.cpp:10:34: error: ‘encode_hex’ is not a member of ‘bc’
   std::cout &lt;&lt; "Public key: " &lt;&lt; bc::encode_hex(public_key) &lt;&lt; std::endl;
                                  ^~
69_addr.cpp:10:49: error: ‘public_key’ was not declared in this scope
   std::cout &lt;&lt; "Public key: " &lt;&lt; bc::encode_hex(public_key) &lt;&lt; std::endl;
                                                 ^~~~~~~~~~
</code></pre>

<p>I suspect there have been changes to the libraries since the book came out in June 2017.</p>

<p>This is the code from the book I try to compile:</p>

<pre><code>#include &lt;bitcoin/bitcoin.hpp&gt;


int main()
{
  bc::ec_secret secret;
  bool success = bc::decode_base16(secret,"038109007313a5807b2eccc082c8c3fbb988a973cacf1a7df9ce725c31v14776");
  assert(success);

  bc::ec_point public_key = bc::secret_to_public_key(secret);
  std::cout &lt;&lt; "Public key: " &lt;&lt; bc::encode_hex(public_key) &lt;&lt; std::endl;

  const bc::short_hash hash = bc::bitcoin_short_hash(public_key);

  bc::data_chunk unencoded_address;
  unencoded_address.reserve(25);
  unencoded_address.push_back(0);
  bc::extend_data(unencoded_address, hash);
  bc::append_checksum(unencoded_address);
  assert(unencoded_address.size() == 25);
  const std::string address = bc::encode_base58(unencoded_address);

  std::cout &lt;&lt; "Address: " &lt;&lt; address &lt;&lt; std::endl;
  return 0;
}
</code></pre>

<hr>

<p>EDIT: Shortly after posting this question I found out about the <strong>github</strong> from my answer below. I used the new code from there to compile and now I am able to do more but still it <strong>exits with error</strong>. Here is the full log, the problematic parts are of course at the bottom and say <code>undefinined reference</code> to <code>__gmpn_set_str</code> and <code>__gmpn_gcdext</code>.</p>

<pre><code>13:28:16 [bitcoin@raspberrypi BuchSkripte]$ g++ -v -o addr 69_addr2.cpp $(pkg-config --cflags --libs libbitcoin)
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/arm-linux-gnueabihf/6/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: ../src/configure -v --with-pkgversion='Raspbian 6.3.0-18+rpi1+deb9u1' --with-bugurl=file:///usr/share/doc/gcc-6/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-6 --program-prefix=arm-linux-gnueabihf- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libitm --disable-libquadmath --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-6-armhf/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-6-armhf --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-6-armhf --with-arch-directory=arm --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-sjlj-exceptions --with-arch=armv6 --with-fpu=vfp --with-float=hard --enable-checking=release --build=arm-linux-gnueabihf --host=arm-linux-gnueabihf --target=arm-linux-gnueabihf
Thread model: posix
gcc version 6.3.0 20170516 (Raspbian 6.3.0-18+rpi1+deb9u1) 
COLLECT_GCC_OPTIONS='-v' '-o' 'addr' '-I' '/home/pi/libbitcoin/include' '-L/home/pi/libbitcoin/lib' '-shared-libgcc' '-march=armv6' '-mfloat-abi=hard' '-mfpu=vfp' '-mtls-dialect=gnu'
 /usr/lib/gcc/arm-linux-gnueabihf/6/cc1plus -quiet -v -I /home/pi/libbitcoin/include -imultilib . -imultiarch arm-linux-gnueabihf -D_GNU_SOURCE 69_addr2.cpp -quiet -dumpbase 69_addr2.cpp -march=armv6 -mfloat-abi=hard -mfpu=vfp -mtls-dialect=gnu -auxbase 69_addr2 -version -o /tmp/cca8JFzr.s
GNU C++14 (Raspbian 6.3.0-18+rpi1+deb9u1) version 6.3.0 20170516 (arm-linux-gnueabihf)
    compiled by GNU C version 6.3.0 20170516, GMP version 6.1.2, MPFR version 3.1.5, MPC version 1.0.3, isl version 0.15
GGC heuristics: --param ggc-min-expand=88 --param ggc-min-heapsize=109911
ignoring duplicate directory "/usr/include/arm-linux-gnueabihf/c++/6"
ignoring nonexistent directory "/usr/local/include/arm-linux-gnueabihf"
ignoring nonexistent directory "/usr/lib/gcc/arm-linux-gnueabihf/6/../../../../arm-linux-gnueabihf/include"
#include "..." search starts here:
#include &lt;...&gt; search starts here:
 /home/pi/libbitcoin/include
 /usr/include/c++/6
 /usr/include/arm-linux-gnueabihf/c++/6
 /usr/include/c++/6/backward
 /usr/lib/gcc/arm-linux-gnueabihf/6/include
 /usr/local/include
 /usr/lib/gcc/arm-linux-gnueabihf/6/include-fixed
 /usr/include/arm-linux-gnueabihf
 /usr/include
End of search list.
GNU C++14 (Raspbian 6.3.0-18+rpi1+deb9u1) version 6.3.0 20170516 (arm-linux-gnueabihf)
    compiled by GNU C version 6.3.0 20170516, GMP version 6.1.2, MPFR version 3.1.5, MPC version 1.0.3, isl version 0.15
GGC heuristics: --param ggc-min-expand=88 --param ggc-min-heapsize=109911
Compiler executable checksum: 79dca666fccaa96025c9107a8b3f60f3
COLLECT_GCC_OPTIONS='-v' '-o' 'addr' '-I' '/home/pi/libbitcoin/include' '-L/home/pi/libbitcoin/lib' '-shared-libgcc' '-march=armv6' '-mfloat-abi=hard' '-mfpu=vfp' '-mtls-dialect=gnu'
 as -v -I /home/pi/libbitcoin/include -march=armv6 -mfloat-abi=hard -mfpu=vfp -meabi=5 -o /tmp/ccryc6jT.o /tmp/cca8JFzr.s
GNU assembler version 2.28 (arm-linux-gnueabihf) using BFD version (GNU Binutils for Raspbian) 2.28
COMPILER_PATH=/usr/lib/gcc/arm-linux-gnueabihf/6/:/usr/lib/gcc/arm-linux-gnueabihf/6/:/usr/lib/gcc/arm-linux-gnueabihf/:/usr/lib/gcc/arm-linux-gnueabihf/6/:/usr/lib/gcc/arm-linux-gnueabihf/
LIBRARY_PATH=/usr/lib/gcc/arm-linux-gnueabihf/6/:/usr/lib/gcc/arm-linux-gnueabihf/6/../../../arm-linux-gnueabihf/:/usr/lib/gcc/arm-linux-gnueabihf/6/../../../:/lib/arm-linux-gnueabihf/:/lib/:/usr/lib/arm-linux-gnueabihf/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-o' 'addr' '-I' '/home/pi/libbitcoin/include' '-L/home/pi/libbitcoin/lib' '-shared-libgcc' '-march=armv6' '-mfloat-abi=hard' '-mfpu=vfp' '-mtls-dialect=gnu'
 /usr/lib/gcc/arm-linux-gnueabihf/6/collect2 -plugin /usr/lib/gcc/arm-linux-gnueabihf/6/liblto_plugin.so -plugin-opt=/usr/lib/gcc/arm-linux-gnueabihf/6/lto-wrapper -plugin-opt=-fresolution=/tmp/cc0zjaUW.res -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc --sysroot=/ --build-id --eh-frame-hdr -dynamic-linker /lib/ld-linux-armhf.so.3 -X --hash-style=gnu -m armelf_linux_eabi -o addr /usr/lib/gcc/arm-linux-gnueabihf/6/../../../arm-linux-gnueabihf/crt1.o /usr/lib/gcc/arm-linux-gnueabihf/6/../../../arm-linux-gnueabihf/crti.o /usr/lib/gcc/arm-linux-gnueabihf/6/crtbegin.o -L/home/pi/libbitcoin/lib -L/usr/lib/gcc/arm-linux-gnueabihf/6 -L/usr/lib/gcc/arm-linux-gnueabihf/6/../../../arm-linux-gnueabihf -L/usr/lib/gcc/arm-linux-gnueabihf/6/../../.. -L/lib/arm-linux-gnueabihf -L/usr/lib/arm-linux-gnueabihf /tmp/ccryc6jT.o -lbitcoin -lboost_chrono -lboost_date_time -lboost_filesystem -lboost_iostreams -lboost_locale -lboost_log -lboost_program_options -lboost_regex -lboost_system -lboost_thread -lpthread -lrt -ldl -lsecp256k1 -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/lib/gcc/arm-linux-gnueabihf/6/crtend.o /usr/lib/gcc/arm-linux-gnueabihf/6/../../../arm-linux-gnueabihf/crtn.o
/home/pi/libbitcoin/lib/libsecp256k1.a(libsecp256k1_la-secp256k1.o): In function `secp256k1_num_mod_inverse':
/home/pi/build-libbitcoin/secp256k1/src/num_gmp_impl.h:128: undefined reference to `__gmpn_gcdext'
/home/pi/libbitcoin/lib/libsecp256k1.a(libsecp256k1_la-secp256k1.o): In function `__gmpn_sub':
/usr/include/arm-linux-gnueabihf/gmp.h:2190: undefined reference to `__gmpn_sub_n'
/home/pi/libbitcoin/lib/libsecp256k1.a(libsecp256k1_la-secp256k1.o): In function `secp256k1_num_set_bin':
/home/pi/build-libbitcoin/secp256k1/src/num_gmp_impl.h:49: undefined reference to `__gmpn_set_str'
/home/pi/build-libbitcoin/secp256k1/src/num_gmp_impl.h:49: undefined reference to `__gmpn_set_str'
/home/pi/build-libbitcoin/secp256k1/src/num_gmp_impl.h:49: undefined reference to `__gmpn_set_str'
/home/pi/libbitcoin/lib/libsecp256k1.a(libsecp256k1_la-secp256k1.o): In function `secp256k1_num_get_bin':
/home/pi/build-libbitcoin/secp256k1/src/num_gmp_impl.h:34: undefined reference to `__gmpn_get_str'
/home/pi/build-libbitcoin/secp256k1/src/num_gmp_impl.h:34: undefined reference to `__gmpn_get_str'
collect2: error: ld returned 1 exit status
</code></pre>

<p>I am not sure if this is a problem specific to my setup or in general but I opened an issue: <a href="https://github.com/bitcoinbook/bitcoinbook/issues/643" rel="nofollow noreferrer">https://github.com/bitcoinbook/bitcoinbook/issues/643</a></p>

<c++><libbitcoin>
How to update an older C++ code from Antonopoulos' book to work with current libraries?
bomben
# How to update an older C++ code from Antonopoulos' book to work with current libraries?

(Asked by: username_0 on 2019-09-05)

I am trying to compile a code in C++ from the Book "Mastering Bitcoin" by Antonopoulos (page 69).

I am new to all of this, including C++, python, etc. I see it as a way of doing something interesting and alongside it learning a bit about different languages.

The code uses `#include <bitcoin/bitcoin.hpp` and I already had troubles making this work on my Raspberry Pi. I installed `libbitcoin` from [source](https://github.com/libbitcoin/libbitcoin-system) and then I had to give the path of `libbitcoin.pc` to the `pkg-config` to be able to execute the following command:

`g++ -o addr addr.cpp $(pkg-config --cflags -- libs libbitcoin)`

The compiler then gives the following errors:

```
69_addr.cpp: In function ‘int main()’:
69_addr.cpp:9:3: error: ‘ec_point’ is not a member of ‘bc’
   bc::ec_point public_key = bc::secret_to_public_key(secret);
   ^~
69_addr.cpp:10:34: error: ‘encode_hex’ is not a member of ‘bc’
   std::cout << "Public key: " << bc::encode_hex(public_key) << std::endl;
                                  ^~
69_addr.cpp:10:49: error: ‘public_key’ was not declared in this scope
   std::cout << "Public key: " << bc::encode_hex(public_key) << std::endl;
                                                 ^~~~~~~~~~

```

I suspect there have been changes to the libraries since the book came out in June 2017.

This is the code from the book I try to compile:

```
#include <bitcoin/bitcoin.hpp>

int main()
{
  bc::ec_secret secret;
  bool success = bc::decode_base16(secret,"038109007313a5807b2eccc082c8c3fbb988a973cacf1a7df9ce725c31v14776");
  assert(success);

  bc::ec_point public_key = bc::secret_to_public_key(secret);
  std::cout << "Public key: " << bc::encode_hex(public_key) << std::endl;

  const bc::short_hash hash = bc::bitcoin_short_hash(public_key);

  bc::data_chunk unencoded_address;
  unencoded_address.reserve(25);
  unencoded_address.push_back(0);
  bc::extend_data(unencoded_address, hash);
  bc::append_checksum(unencoded_address);
  assert(unencoded_address.size() == 25);
  const std::string address = bc::encode_base58(unencoded_address);

  std::cout << "Address: " << address << std::endl;
  return 0;
}

```

---

EDIT: Shortly after posting this question I found out about the **github** from my answer below. I used the new code from there to compile and now I am able to do more but still it **exits with error**. Here is the full log, the problematic parts are of course at the bottom and say `undefinined reference` to `__gmpn_set_str` and `__gmpn_gcdext`.

```
13:28:16 [bitcoin@raspberrypi BuchSkripte]$ g++ -v -o addr 69_addr2.cpp $(pkg-config --cflags --libs libbitcoin)
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/arm-linux-gnueabihf/6/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: ../src/configure -v --with-pkgversion='Raspbian 6.3.0-18+rpi1+deb9u1' --with-bugurl=file:///usr/share/doc/gcc-6/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-6 --program-prefix=arm-linux-gnueabihf- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libitm --disable-libquadmath --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-6-armhf/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-6-armhf --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-6-armhf --with-arch-directory=arm --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --with-target-system-zlib --enable-objc-gc=auto --enable-multiarch --disable-sjlj-exceptions --with-arch=armv6 --with-fpu=vfp --with-float=hard --enable-checking=release --build=arm-linux-gnueabihf --host=arm-linux-gnueabihf --target=arm-linux-gnueabihf
Thread model: posix
gcc version 6.3.0 20170516 (Raspbian 6.3.0-18+rpi1+deb9u1) 
COLLECT_GCC_OPTIONS='-v' '-o' 'addr' '-I' '/home/pi/libbitcoin/include' '-L/home/pi/libbitcoin/lib' '-shared-libgcc' '-march=armv6' '-mfloat-abi=hard' '-mfpu=vfp' '-mtls-dialect=gnu'
 /usr/lib/gcc/arm-linux-gnueabihf/6/cc1plus -quiet -v -I /home/pi/libbitcoin/include -imultilib . -imultiarch arm-linux-gnueabihf -D_GNU_SOURCE 69_addr2.cpp -quiet -dumpbase 69_addr2.cpp -march=armv6 -mfloat-abi=hard -mfpu=vfp -mtls-dialect=gnu -auxbase 69_addr2 -version -o /tmp/cca8JFzr.s
GNU C++14 (Raspbian 6.3.0-18+rpi1+deb9u1) version 6.3.0 20170516 (arm-linux-gnueabihf)
    compiled by GNU C version 6.3.0 20170516, GMP version 6.1.2, MPFR version 3.1.5, MPC version 1.0.3, isl version 0.15
GGC heuristics: --param ggc-min-expand=88 --param ggc-min-heapsize=109911
ignoring duplicate directory "/usr/include/arm-linux-gnueabihf/c++/6"
ignoring nonexistent directory "/usr/local/include/arm-linux-gnueabihf"
ignoring nonexistent directory "/usr/lib/gcc/arm-linux-gnueabihf/6/../../../../arm-linux-gnueabihf/include"
#include "..." search starts here:
#include <...> search starts here:
 /home/pi/libbitcoin/include
 /usr/include/c++/6
 /usr/include/arm-linux-gnueabihf/c++/6
 /usr/include/c++/6/backward
 /usr/lib/gcc/arm-linux-gnueabihf/6/include
 /usr/local/include
 /usr/lib/gcc/arm-linux-gnueabihf/6/include-fixed
 /usr/include/arm-linux-gnueabihf
 /usr/include
End of search list.
GNU C++14 (Raspbian 6.3.0-18+rpi1+deb9u1) version 6.3.0 20170516 (arm-linux-gnueabihf)
    compiled by GNU C version 6.3.0 20170516, GMP version 6.1.2, MPFR version 3.1.5, MPC version 1.0.3, isl version 0.15
GGC heuristics: --param ggc-min-expand=88 --param ggc-min-heapsize=109911
Compiler executable checksum: 79dca666fccaa96025c9107a8b3f60f3
COLLECT_GCC_OPTIONS='-v' '-o' 'addr' '-I' '/home/pi/libbitcoin/include' '-L/home/pi/libbitcoin/lib' '-shared-libgcc' '-march=armv6' '-mfloat-abi=hard' '-mfpu=vfp' '-mtls-dialect=gnu'
 as -v -I /home/pi/libbitcoin/include -march=armv6 -mfloat-abi=hard -mfpu=vfp -meabi=5 -o /tmp/ccryc6jT.o /tmp/cca8JFzr.s
GNU assembler version 2.28 (arm-linux-gnueabihf) using BFD version (GNU Binutils for Raspbian) 2.28
COMPILER_PATH=/usr/lib/gcc/arm-linux-gnueabihf/6/:/usr/lib/gcc/arm-linux-gnueabihf/6/:/usr/lib/gcc/arm-linux-gnueabihf/:/usr/lib/gcc/arm-linux-gnueabihf/6/:/usr/lib/gcc/arm-linux-gnueabihf/
LIBRARY_PATH=/usr/lib/gcc/arm-linux-gnueabihf/6/:/usr/lib/gcc/arm-linux-gnueabihf/6/../../../arm-linux-gnueabihf/:/usr/lib/gcc/arm-linux-gnueabihf/6/../../../:/lib/arm-linux-gnueabihf/:/lib/:/usr/lib/arm-linux-gnueabihf/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-o' 'addr' '-I' '/home/pi/libbitcoin/include' '-L/home/pi/libbitcoin/lib' '-shared-libgcc' '-march=armv6' '-mfloat-abi=hard' '-mfpu=vfp' '-mtls-dialect=gnu'
 /usr/lib/gcc/arm-linux-gnueabihf/6/collect2 -plugin /usr/lib/gcc/arm-linux-gnueabihf/6/liblto_plugin.so -plugin-opt=/usr/lib/gcc/arm-linux-gnueabihf/6/lto-wrapper -plugin-opt=-fresolution=/tmp/cc0zjaUW.res -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lc -plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lgcc --sysroot=/ --build-id --eh-frame-hdr -dynamic-linker /lib/ld-linux-armhf.so.3 -X --hash-style=gnu -m armelf_linux_eabi -o addr /usr/lib/gcc/arm-linux-gnueabihf/6/../../../arm-linux-gnueabihf/crt1.o /usr/lib/gcc/arm-linux-gnueabihf/6/../../../arm-linux-gnueabihf/crti.o /usr/lib/gcc/arm-linux-gnueabihf/6/crtbegin.o -L/home/pi/libbitcoin/lib -L/usr/lib/gcc/arm-linux-gnueabihf/6 -L/usr/lib/gcc/arm-linux-gnueabihf/6/../../../arm-linux-gnueabihf -L/usr/lib/gcc/arm-linux-gnueabihf/6/../../.. -L/lib/arm-linux-gnueabihf -L/usr/lib/arm-linux-gnueabihf /tmp/ccryc6jT.o -lbitcoin -lboost_chrono -lboost_date_time -lboost_filesystem -lboost_iostreams -lboost_locale -lboost_log -lboost_program_options -lboost_regex -lboost_system -lboost_thread -lpthread -lrt -ldl -lsecp256k1 -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/lib/gcc/arm-linux-gnueabihf/6/crtend.o /usr/lib/gcc/arm-linux-gnueabihf/6/../../../arm-linux-gnueabihf/crtn.o
/home/pi/libbitcoin/lib/libsecp256k1.a(libsecp256k1_la-secp256k1.o): In function `secp256k1_num_mod_inverse':
/home/pi/build-libbitcoin/secp256k1/src/num_gmp_impl.h:128: undefined reference to `__gmpn_gcdext'
/home/pi/libbitcoin/lib/libsecp256k1.a(libsecp256k1_la-secp256k1.o): In function `__gmpn_sub':
/usr/include/arm-linux-gnueabihf/gmp.h:2190: undefined reference to `__gmpn_sub_n'
/home/pi/libbitcoin/lib/libsecp256k1.a(libsecp256k1_la-secp256k1.o): In function `secp256k1_num_set_bin':
/home/pi/build-libbitcoin/secp256k1/src/num_gmp_impl.h:49: undefined reference to `__gmpn_set_str'
/home/pi/build-libbitcoin/secp256k1/src/num_gmp_impl.h:49: undefined reference to `__gmpn_set_str'
/home/pi/build-libbitcoin/secp256k1/src/num_gmp_impl.h:49: undefined reference to `__gmpn_set_str'
/home/pi/libbitcoin/lib/libsecp256k1.a(libsecp256k1_la-secp256k1.o): In function `secp256k1_num_get_bin':
/home/pi/build-libbitcoin/secp256k1/src/num_gmp_impl.h:34: undefined reference to `__gmpn_get_str'
/home/pi/build-libbitcoin/secp256k1/src/num_gmp_impl.h:34: undefined reference to `__gmpn_get_str'
collect2: error: ld returned 1 exit status

```

I am not sure if this is a problem specific to my setup or in general but I opened an issue: <https://github.com/bitcoinbook/bitcoinbook/issues/643>

**Tags:** c++, libbitcoin


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## 1 answers

### Answer by username_0 on 2019-09-05. Score: 2 | Accepted answer

I just found out there is a [github](https://github.com/bitcoinbook/bitcoinbook) where the code is updated.

The specific code for `addr.cpp` is [this](https://github.com/bitcoinbook/bitcoinbook/blob/develop/code/addr.cpp).

Compilation works with `--static` e.g. `g++ -o addr addr.cpp $(pkg-config --cflags --libs --static libbitcoin)`.

> **Comments:**
> **username_1**: You can add `-lgmp` when it happens  

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