wget https://www.gnuwakes.org/depot/1.1/main/sources/which-2.21.tar.gz

tar -xf which-2.21.tar.gz

SOURCES_DIR=$PWD/which-2.21
INSTALL_DIR=$PWD/which-2.21-install
BUILD_DIR=$PWD/which-2.21-build

mkdir $INSTALL_DIR $BUILD_DIR
cd $BUILD_DIR

$SOURCES_DIR/configure --prefix=/usr \
  --sysconfdir=/etc --localstatedir=/var && \
  make && make DESTDIR=$INSTALL_DIR install