message: Add OpenBSD instructions for building the Qt GUI
diff: @@ -2,9 +2,7 @@ OpenBSD build guide
  ======================
  (updated for OpenBSD 6.7)
  -This guide describes how to build peercoind and command-line utilities on OpenBSD.
  -
  -OpenBSD is most commonly used as a server OS, so this guide does not contain instructions for building the GUI.
  +This guide describes how to build peercoind, peercoin-qt, and command-line utilities on OpenBSD.
  Preparation
  -------------
  @@ -13,6 +11,7 @@ Run the following as root to install the base dependencies for building:
  ```bash
  pkg_add git gmake libevent libtool boost
  +pkg_add qt5 # (optional for enabling the GUI)
  pkg_add autoconf # (select highest version, e.g. 2.69)
  pkg_add automake # (select highest version, e.g. 1.16)
  pkg_add python # (select highest version, e.g. 3.8)
  @@ -80,6 +79,14 @@ To configure without wallet:
  ./configure --disable-wallet --with-gui=no CC=cc CC_FOR_BUILD=cc CXX=c++ MAKE=gmake
  ```
  +To configure with GUI:
  +```bash
  +./configure --with-gui=yes CC=cc CXX=c++ \
  + BDB_LIBS="-L${BDB_PREFIX}/lib -ldb_cxx-4.8" \
  + BDB_CFLAGS="-I${BDB_PREFIX}/include" \
  + MAKE=gmake
  +```
  +
  Build and run the tests:
  ```bash
  gmake # use -jX here for parallelism
  