fetch $BISON_URL

sudo chroot "$SYSROOT" /usr/bin/env -i \
	MAKEFLAGS="$MAKEFLAGS" \
	PATH=/usr/bin:/usr/sbin \
	SOURCES=/sources \
	BISON_VERSION=$BISON_VERSION \
	/usr/bin/bash <<- "EOF"
		set -euo pipefail

		cd "$SOURCES" && tar xf bison-$BISON_VERSION.tar.xz && cd bison-$BISON_VERSION

		./configure \
			--prefix=/usr \
			--silent \
			--quiet
		
		make && make install

		cd "$SOURCES" && rm -rf bison-$BISON_VERSION
EOF