README.md: Updated OpenBSD build instructions

* Removed the db package, as it is not required
* Added the libiconv package
* Updated the boost build instructions (added locale)
* Updated cppzmq to version 4.2.3 which does not require the symlink hack anymore

added missing hashes for boost patches

README.md

@@ -373,7 +373,7 @@ To build: `env CC=egcc CXX=eg++ CPP=ecpp DEVELOPER_LOCAL_TOOLS=1 BOOST_ROOT=/pat
 
 #### OpenBSD >= 6.2
 
-You will need to add a few packages to your system. Choose version 4 for db. `pkg_add db cmake miniupnpc zeromq`.
+You will need to add a few packages to your system. `pkg_add cmake miniupnpc zeromq libiconv`.
 
 The doxygen and graphviz packages are optional and require the xbase set.
 
@@ -396,16 +396,24 @@ ftp -o boost_1_64_0.tar.bz2 https://netcologne.dl.sourceforge.net/project/boost/
 echo "7bcc5caace97baa948931d712ea5f37038dbb1c5d89b43ad4def4ed7cb683332 boost_1_64_0.tar.bz2" | sha256 -c
 tar xfj boost_1_64_0.tar.bz2
 
-# Fetch a boost patch, required for OpenBSD
-ftp -o boost.patch https://raw.githubusercontent.com/openbsd/ports/bee9e6df517077a7269ff0dfd57995f5c6a10379/devel/boost/patches/patch-boost_test_impl_execution_monitor_ipp
+# Fetch and apply boost patches, required for OpenBSD
+ftp -o boost_test_impl_execution_monitor_ipp.patch https://raw.githubusercontent.com/openbsd/ports/bee9e6df517077a7269ff0dfd57995f5c6a10379/devel/boost/patches/patch-boost_test_impl_execution_monitor_ipp
+ftp -o boost_config_platform_bsd_hpp.patch https://raw.githubusercontent.com/openbsd/ports/90658284fb786f5a60dd9d6e8d14500c167bdaa0/devel/boost/patches/patch-boost_config_platform_bsd_hpp
+
+# MUST output: (SHA256) boost_config_platform_bsd_hpp.patch: OK
+echo "1f5e59d1154f16ee1e0cc169395f30d5e7d22a5bd9f86358f738b0ccaea5e51d boost_config_platform_bsd_hpp.patch" | sha256 -c
+# MUST output: (SHA256) boost_test_impl_execution_monitor_ipp.patch: OK
+echo "30cec182a1437d40c3e0bd9a866ab5ddc1400a56185b7e671bb3782634ed0206 boost_test_impl_execution_monitor_ipp.patch" | sha256 -c
+
 cd boost_1_64_0
-patch -p0 < ../boost.patch
+patch -p0 < ../boost_test_impl_execution_monitor_ipp.patch
+patch -p0 < ../boost_config_platform_bsd_hpp.patch
 
 # Start building boost
 echo 'using clang : : c++ : <cxxflags>"-fvisibility=hidden -fPIC" <linkflags>"" <archiver>"ar" <striper>"strip"  <ranlib>"ranlib" <rc>"" : ;' > user-config.jam
-./bootstrap.sh --without-icu --with-libraries=chrono,filesystem,program_options,system,thread,test,date_time,regex,serialization --with-toolset=clang
-./b2 toolset=clang cxxflags="-stdlib=libc++" linkflags="-stdlib=libc++"
-doas ./b2 -d0 runtime-link=shared threadapi=pthread threading=multi link=static variant=release --layout=tagged --build-type=complete --user-config=user-config.jam -sNO_BZIP2=1 --prefix=/usr/local install
+./bootstrap.sh --without-icu --with-libraries=chrono,filesystem,program_options,system,thread,test,date_time,regex,serialization,locale --with-toolset=clang
+./b2 toolset=clang cxxflags="-stdlib=libc++" linkflags="-stdlib=libc++" -sICONV_PATH=/usr/local
+doas ./b2 -d0 runtime-link=shared threadapi=pthread threading=multi link=static variant=release --layout=tagged --build-type=complete --user-config=user-config.jam -sNO_BZIP2=1 -sICONV_PATH=/usr/local --prefix=/usr/local install
 ```
 
 Build cppzmq
@@ -415,22 +423,19 @@ Build the cppzmq bindings.
 We assume you are compiling with a non-root user and you have `doas` enabled.
 
 ```
-# Create a library link so cmake is able to find it
-doas ln -s /usr/local/lib/libzmq.so.4.1 /usr/local/lib/libzmq.so
-
 # Create cppzmq building directory
 mkdir ~/cppzmq
 cd ~/cppzmq
 
 # Fetch cppzmq source
-ftp -o cppzmq-4.2.2.tar.gz https://github.com/zeromq/cppzmq/archive/v4.2.2.tar.gz
+ftp -o cppzmq-4.2.3.tar.gz https://github.com/zeromq/cppzmq/archive/v4.2.3.tar.gz
 
-# MUST output: (SHA256) cppzmq-4.2.2.tar.gz: OK
-echo "3ef50070ac5877c06c6bb25091028465020e181bbfd08f110294ed6bc419737d cppzmq-4.2.2.tar.gz" | sha256 -c
-tar xfz cppzmq-4.2.2.tar.gz
+# MUST output: (SHA256) cppzmq-4.2.3.tar.gz: OK
+echo "3e6b57bf49115f4ae893b1ff7848ead7267013087dc7be1ab27636a97144d373 cppzmq-4.2.3.tar.gz" | sha256 -c
+tar xfz cppzmq-4.2.3.tar.gz
 
 # Start building cppzmq
-cd cppzmq-4.2.2
+cd cppzmq-4.2.3
 mkdir build
 cd build
 cmake ..