Add BSD support to bootstrap.

bootstrap

@@ -3,4 +3,40 @@
 # Script to help bootstrap the build system when checked out from git
 #
 
-autoreconf -i
+bsd_environment() {
+	# Based on https://github.com/rvm/rvm/blob/59fe3b39f0fb5ae01ed5b9aa187201080815ac16/scripts/functions/build_config_system#L123
+	if [[  -z "${AUTOCONF_VERSION:-}" ]]
+	then
+		export AUTOCONF_VERSION
+		AUTOCONF_VERSION="$(
+		    ls -1 /usr/local/bin/autoreconf-* |
+		    awk -F- '{print $NF}' |
+		    sort |
+		    tail -n 1
+		)"
+		echo "Using autoconf version: $AUTOCONF_VERSION"
+	fi
+
+	if [[  -z "${AUTOMAKE_VERSION:-}" ]]
+	then
+		export AUTOMAKE_VERSION
+		# FreeBSD might have automake-wrapper
+		AUTOMAKE_VERSION="$(
+		    ls -1 /usr/local/bin/automake-1* |
+		    awk -F- '{print $NF}' |
+		    sort |
+		    tail -n 1
+		)"
+		echo "Using automake version: $AUTOMAKE_VERSION"
+	fi
+}
+
+# Use the uname string to figure out if this is a BSD
+case "$(uname)" in
+	*BSD*) bsd_environment ;;
+esac
+
+test -n "$srcdir" || srcdir="$(dirname "$0")"
+test -n "$srcdir" || srcdir=.
+
+autoreconf --force --install --verbose "$srcdir"