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UNIX BUILD NOTES

Some notes on how to build Bitcoin in Unix.

To Build

./autogen.sh
./configure
make

This will build bitcoin-qt as well if the dependencies are met.

Dependencies

Library	Purpose	Description
libssl	SSL Support	Secure communications
libdb4.8	Berkeley DB	Wallet storage
libboost	Boost	C++ Library
miniupnpc	UPnP Support	Optional firewall-jumping support
qt	GUI	GUI toolkit
protobuf	Payments in GUI	Data interchange format used for payment protocol
libqrencode	QR codes in GUI	Optional for generating QR codes

miniupnpc may be used for UPnP port mapping. It can be downloaded from here. UPnP support is compiled in and turned off by default. See the configure options for upnp behavior desired:

--without-miniupnpc      No UPnP support miniupnp not required
--disable-upnp-default   (the default) UPnP support turned off by default at runtime
--enable-upnp-default    UPnP support turned on by default at runtime

IPv6 support may be disabled by setting:

--disable-ipv6           Disable IPv6 support

Licenses of statically linked libraries: Berkeley DB New BSD license with additional requirement that linked software must be free open source Boost MIT-like license miniupnpc New (3-clause) BSD license

For the versions used in this release, see doc/release-process.md under Fetch and build inputs.

System requirements

C++ compilers are memory-hungry. It is recommended to have at least 1 GB of memory available when compiling Bitcoin Core. With 512MB of memory or less compilation will take much longer due to swap thrashing.

Dependency Build Instructions: Ubuntu & Debian

Build requirements:

sudo apt-get install build-essential
sudo apt-get install libtool autotools-dev autoconf
sudo apt-get install libssl-dev

for Ubuntu 12.04 and later:

sudo apt-get install libboost-all-dev

db4.8 packages are available here. You can add the repository using the following command:

    sudo add-apt-repository ppa:bitcoin/bitcoin
    sudo apt-get update

Ubuntu 12.04 and later have packages for libdb5.1-dev and libdb5.1++-dev, but using these will break binary wallet compatibility, and is not recommended.

for Ubuntu 13.10: libboost1.54 will not work, remove libboost1.54-all-dev and install libboost1.53-all-dev instead.

for Debian 7 (Wheezy) and later: The oldstable repository contains db4.8 packages. Add the following line to /etc/apt/sources.list, replacing [mirror] with any official debian mirror.

deb http://[mirror]/debian/ oldstable main

To enable the change run

sudo apt-get update

for other Ubuntu & Debian:

sudo apt-get install libdb4.8-dev
sudo apt-get install libdb4.8++-dev
sudo apt-get install libboost1.55-all-dev

Optional:

sudo apt-get install libminiupnpc-dev (see --with-miniupnpc and --enable-upnp-default)

Dependencies for the GUI: Ubuntu & Debian

If you want to build Bitcoin-Qt, make sure that the required packages for Qt development are installed. Either Qt 4 or Qt 5 are necessary to build the GUI. If both Qt 4 and Qt 5 are installed, Qt 4 will be used. Pass --with-gui=qt5 to configure to choose Qt5. To build without GUI pass --without-gui.

To build with Qt 4 you need the following:

sudo apt-get install libqt4-dev libprotobuf-dev protobuf-compiler

For Qt 5 you need the following:

sudo apt-get install libqt5gui5 libqt5core5 libqt5dbus5 qttools5-dev qttools5-dev-tools libprotobuf-dev

libqrencode (optional) can be installed with:

sudo apt-get install libqrencode-dev

Once these are installed, they will be found by configure and a bitcoin-qt executable will be built by default.

Notes

The release is built with GCC and then "strip bitcoind" to strip the debug symbols, which reduces the executable size by about 90%.

miniupnpc

tar -xzvf miniupnpc-1.6.tar.gz
cd miniupnpc-1.6
make
sudo su
make install

Berkeley DB

You need Berkeley DB 4.8. If you have to build it yourself:

wget 'http://download.oracle.com/berkeley-db/db-4.8.30.NC.tar.gz'
echo '12edc0df75bf9abd7f82f821795bcee50f42cb2e5f76a6a281b85732798364ef  db-4.8.30.NC.tar.gz' | sha256sum -c
# -> db-4.8.30.NC.tar.gz: OK
tar -xzvf db-4.8.30.NC.tar.gz
cd build_unix/
../dist/configure --enable-cxx
make
sudo make install

Boost

If you need to build Boost yourself:

sudo su
./bootstrap.sh
./bjam install

Security

To help make your bitcoin installation more secure by making certain attacks impossible to exploit even if a vulnerability is found, binaries are hardened by default. This can be disabled with:

Hardening Flags:

./configure --enable-hardening
./configure --disable-hardening

Hardening enables the following features:

Position Independent Executable Build position independent code to take advantage of Address Space Layout Randomization offered by some kernels. An attacker who is able to cause execution of code at an arbitrary memory location is thwarted if he doesn't know where anything useful is located. The stack and heap are randomly located by default but this allows the code section to be randomly located as well.

On an Amd64 processor where a library was not compiled with -fPIC, this will cause an error such as: "relocation R_X86_64_32 against `......' can not be used when making a shared object;"

To test that you have built PIE executable, install scanelf, part of paxutils, and use:
```
  scanelf -e ./bitcoin
```
The output should contain: TYPE ET_DYN
Non-executable Stack If the stack is executable then trivial stack based buffer overflow exploits are possible if vulnerable buffers are found. By default, bitcoin should be built with a non-executable stack but if one of the libraries it uses asks for an executable stack or someone makes a mistake and uses a compiler extension which requires an executable stack, it will silently build an executable without the non-executable stack protection.

To verify that the stack is non-executable after compiling use: scanelf -e ./bitcoin

the output should contain: STK/REL/PTL RW- R-- RW-

The STK RW- means that the stack is readable and writeable but not executable.

Disable-wallet mode

When the intention is to run only a P2P node without a wallet, bitcoin may be compiled in disable-wallet mode with:

./configure --disable-wallet

In this case there is no dependency on Berkeley DB 4.8.

Mining is also possible in disable-wallet mode, but only using the getblocktemplate RPC call not getwork.

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