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+biber for OpenBSD — Build Process
+=================================
+
+Perlbrew
+--------
+Once installed, [perlbrew](https://perlbrew.pl) can be started as
+follows on OpenBSD:
+
+1. Add a file named `kshrc` in `$HOME/perl5/perlbrew/etc/` with the
+   following contents:
+   
+   ```sh
+   export PERLBREW_SHELLRC_VERSION=0.98
+   export PERLBREW_ROOT=/home/robert/perl5/perlbrew
+
+
+        __perlbrew_reinit() {
+    if [[ ! -d "$PERLBREW_HOME" ]]; then
+        mkdir -p "$PERLBREW_HOME"
+    fi
+
+    [ -f "$PERLBREW_HOME/init" ] && rm "$PERLBREW_HOME/init"
+    echo '# DO NOT EDIT THIS FILE' > "$PERLBREW_HOME/init"
+    command perlbrew env $1 | \grep PERLBREW_ >> "$PERLBREW_HOME/init"
+    . "$PERLBREW_HOME/init"
+    __perlbrew_set_path
+        }
+
+        __perlbrew_set_path () {
+    export PATH=${PERLBREW_PATH:-$PERLBREW_ROOT/bin}:$PATH
+    hash -r
+        }
+
+        __perlbrew_set_env() {
+    code=
+    code="$($perlbrew_command env $@)" || return $?
+    eval "$code"
+        }
+
+        __perlbrew_activate() {
+    [[ -n $(alias perl 2>/dev/null) ]] && unalias perl 2>/dev/null
+
+    if [[ -n "${PERLBREW_PERL:-}" ]]; then
+          __perlbrew_set_env "${PERLBREW_PERL:-}${PERLBREW_LIB:+@}$PERLBREW_LIB"
+    fi
+
+    __perlbrew_set_path
+        }
+
+        __perlbrew_deactivate() {
+    __perlbrew_set_env
+    unset PERLBREW_PERL
+    unset PERLBREW_LIB
+    __perlbrew_set_path
+        }
+
+        perlbrew () {
+    exit_status=
+    short_option=
+    export SHELL
+
+    if [[ $1 == -* ]]; then
+        short_option=$1
+        shift
+    else
+        short_option=""
+    fi
+
+    case $1 in
+        (use)
+            if [[ -z "$2" ]] ; then
+                echo -n "Currently using ${PERLBREW_PERL:-system perl}"
+                [ -n "$PERLBREW_LIB" ] && echo -n "@$PERLBREW_LIB"
+                echo
+            else
+                __perlbrew_set_env "$2" && { __perlbrew_set_path ; true ; }
+                exit_status="$?"
+            fi
+            ;;
+
+        (switch)
+              if [[ -z "$2" ]] ; then
+                  command perlbrew switch
+              else
+                  perlbrew use $2 && { __perlbrew_reinit $2 ; true ; }
+                  exit_status=$?
+              fi
+              ;;
+
+        (off)
+            __perlbrew_deactivate
+            echo "perlbrew is turned off."
+            ;;
+
+        (switch-off)
+            __perlbrew_deactivate
+            __perlbrew_reinit
+            echo "perlbrew is switched off."
+            ;;
+
+        (*)
+            command perlbrew $short_option "$@"
+            exit_status=$?
+            ;;
+    esac
+    hash -r
+    return ${exit_status:-0}
+        }
+
+        [[ -z "${PERLBREW_ROOT:-}" ]] && export PERLBREW_ROOT="$HOME/perl5/perlbrew"
+        [[ -z "${PERLBREW_HOME:-}" ]] && export PERLBREW_HOME="$HOME/.perlbrew"
+
+        if [[ ! -n "${PERLBREW_SKIP_INIT:-}" ]]; then
+                if [[ -f "${PERLBREW_HOME:-}/init" ]]; then
+        . "$PERLBREW_HOME/init"
+                fi
+        fi
+
+        if [[ -f "${PERLBREW_ROOT:-}/bin/perlbrew" ]]; then
+                perlbrew_command="${PERLBREW_ROOT:-}/bin/perlbrew"
+        else
+                perlbrew_command="perlbrew"
+        fi
+
+        __perlbrew_activate
+   ```
+   
+2. Put somewhere in your `$PATH` a file named `useperlbrew` with the
+   following contents:
+   
+   ```sh
+   #!/bin/sh
+
+        # perlbrew
+        . $HOME/perl5/perlbrew/etc/kshrc
+        perlbrew use perl-5.36.3
+        export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$HOME/perl5/perlbrew/perls/perl-5.36.3/lib
+   ```
+   
+As can be seen, the files above assume `perlbrew` v0.98 and
+`perl-5.36.3`. Adapt.  These two files allow to initialize a perlbrew
+session as follows:
+
+```sh
+. useperlbrew
+```
+
+biber
+-----
+
+0. Prerequisite: `XSLT C Library`. Do as root:
+
+        ```sh
+        pkg_add libxslt
+        ```
+
+1. Clone the git repository of `biber`:
+
+        ```sh
+        git clone https://github.com/plk/biber.git
+        ```
+        
+2. Proceed with the installation of `biber` as described in the
+   [documentation available on
+   CTAN](http://mirrors.ctan.org/biblio/biber/base/documentation/biber.pdf):
+   
+   ```sh
+   cd biber
+   git checkout vX.YY # eg. v2.20 for biber 2.20
+   
+   cpanm Module::Build
+   perl Build.PL
+   ./Build install
+   ```
+
+3. Now build and install `PAR::Packer`:
+
+        ```sh
+        cpanm PAR::Packer
+        ```
+        
+4. Finally, build `biber` executable for OpenBSD as follows:
+
+        ```sh
+        mkdir dist/openbsd_amd64 && cd dist/openbsd_amd64
+        ```
+        
+        Add in this directory a new file named `build.sh` with the
+    following contents:
+        
+        ```sh
+        #!/bin/sh
+
+        PAR_VERBATIM=1 pp \
+                --module=deprecate \
+                --module=BibTeX::Parser \
+                --module=Text::BibTeX \
+                --module=Biber::Input::file::bibtex \
+                --module=Biber::Input::file::biblatexml \
+                --module=Biber::Output::dot \
+                --module=Biber::Output::bbl \
+                --module=Biber::Output::bibtex \
+                --module=Biber::Output::biblatexml \
+                --module=Pod::Simple::TranscodeSmart \
+                --module=Pod::Simple::TranscodeDumb \
+                --module=List::MoreUtils::XS \
+                --module=List::SomeUtils::XS \
+                --module=List::MoreUtils::PP \
+                --module=HTTP::Status \
+                --module=HTTP::Date \
+                --module=Encode:: \
+                --module=File::Find::Rule \
+                --module=IO::Socket::SSL \
+                --module=IO::String \
+                --module=PerlIO::utf8_strict \
+                --module=Text::CSV_XS \
+                --module=DateTime \
+                --addfile="../../data/biber-tool.conf;lib/Biber/biber-tool.conf" \
+                --addfile="../../data/schemata/config.rnc;lib/Biber/config.rnc" \
+                --addfile="../../data/schemata/config.rng;lib/Biber/config.rng"\
+                --addfile="../../data/schemata/bcf.rnc;lib/Biber/bcf.rnc" \
+                --addfile="../../data/schemata/bcf.rng;lib/Biber/bcf.rng" \
+                --addfile="../../lib/Biber/LaTeX/recode_data.xml;lib/Biber/LaTeX/recode_data.xml" \
+                --addfile="../../data/bcf.xsl;lib/Biber/bcf.xsl" \
+                --addfile="$HOME/perl5/perlbrew/perls/perl-5.36.3/lib/libbtparse.so;../libbtparse.so" \
+                --cachedeps=scancache \
+                --output=biber-openbsd \
+                ../../bin/biber
+        ```
+        
+5. Finally, to produce `biber-openbsd`, make `build.sh` executable and
+   run it:
+   
+   ```sh
+   chmod +x build.sh
+   ./build.sh
+   ```