wget http://www.gnuwakes.org/depot/1.0/main/sources/grep-2.21.tar.xz

tar -xf grep-2.21.tar.xz

wget http://www.gnuwakes.org/depot/1.0/main/sources/grep.patch
cd grep-2.21
patch -p1 < ../grep.patch 
cd ..

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

mkdir $INSTALL_DIR $BUILD_DIR
cd $BUILD_DIR

$SOURCES_DIR/configure --prefix=/usr --bindir=/bin && \
  make && make DESTDIR=$INSTALL_DIR install