Install Ed by running the following commands: cp buf.c buf.c-temp && sed 's/int u/int u, sfd/' buf.c-temp | \    sed '/.*\*mktemp.*/d' | \    sed 's/.*if (mktemp.*/ sfd = mkstemp(sfn);\    if ((sfd == -1) || (sfp = fopen (sfn, "w+")) == NULL)/' > buf.c ./configure --prefix=/usr && make && make install && mv /usr/bin/ed /usr/bin/red /bin