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# OpenBSD Build Guide
**Updated for OpenBSD [7.1](https://www.openbsd.org/71.html)**
This guide describes how to build bitcoind, command-line utilities, and GUI on OpenBSD.
## Preparation
### 1. Install Required Dependencies
Run the following as root to install the base dependencies for building.
```bash
pkg_add bash git gmake libevent libtool boost
# Select the newest version of the following packages:
pkg_add autoconf automake python
```
See [dependencies.md](dependencies.md) for a complete overview.
### 2. Clone Bitcoin Repo
Clone the Bitcoin Core repository to a directory. All build scripts and commands will run from this directory.
``` bash
git clone https://github.com/bitcoin/bitcoin.git
```
### 3. Install Optional Dependencies
#### Wallet Dependencies
It is not necessary to build wallet functionality to run either `bitcoind` or `bitcoin-qt`.
###### Descriptor Wallet Support
`sqlite3` is required to support [descriptor wallets](descriptors.md).
``` bash
pkg_add install sqlite3
```
###### Legacy Wallet Support
BerkeleyDB is only required to support legacy wallets.
It is recommended to use Berkeley DB 4.8. You cannot use the BerkeleyDB library
from ports. However you can build it yourself, [using the installation script included in contrib/](/contrib/install_db4.sh), like so, from the root of the repository.
```bash
./contrib/install_db4.sh `pwd`
```
Then set `BDB_PREFIX`:
```bash
export BDB_PREFIX="$PWD/db4"
```
#### GUI Dependencies
###### Qt5
Bitcoin Core includes a GUI built with the cross-platform Qt Framework. To compile the GUI, Qt 5 is required.
```bash
pkg_add qt5
```
## Building Bitcoin Core
**Important**: Use `gmake` (the non-GNU `make` will exit with an error).
Preparation:
```bash
# Adapt the following for the version you installed (major.minor only):
export AUTOCONF_VERSION=2.71
export AUTOMAKE_VERSION=1.16
./autogen.sh
```
### 1. Configuration
Note that external signer support is currently not available on OpenBSD, since
the used header-only library Boost.Process fails to compile (certain system
calls and preprocessor defines like `waitid()` and `WEXITED` are missing).
There are many ways to configure Bitcoin Core, here are a few common examples:
##### Descriptor Wallet and GUI:
This enables the GUI and descriptor wallet support, assuming `sqlite` and `qt5` are installed.
```bash
./configure MAKE=gmake
```
##### Descriptor & Legacy Wallet. No GUI:
This enables support for both wallet types and disables the GUI:
```bash
./configure --with-gui=no \
BDB_LIBS="-L${BDB_PREFIX}/lib -ldb_cxx-4.8" \
BDB_CFLAGS="-I${BDB_PREFIX}/include" \
MAKE=gmake
```
### 2. Compile
**Important**: Use `gmake` (the non-GNU `make` will exit with an error).
```bash
gmake # use "-j N" for N parallel jobs
gmake check # Run tests if Python 3 is available
```
## Resource limits
If the build runs into out-of-memory errors, the instructions in this section
might help.
The standard ulimit restrictions in OpenBSD are very strict:
```bash
data(kbytes) 1572864
```
This is, unfortunately, in some cases not enough to compile some `.cpp` files in the project,
(see issue [#6658](https://github.com/bitcoin/bitcoin/issues/6658)).
If your user is in the `staff` group the limit can be raised with:
```bash
ulimit -d 3000000
```
The change will only affect the current shell and processes spawned by it. To
make the change system-wide, change `datasize-cur` and `datasize-max` in
`/etc/login.conf`, and reboot.
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