$ export CFLAGS="-march=i486 -mtune=i686 -Os -pipe"
$ export CXXFLAGS="-march=i486 -mtune=i686 -Os -pipe -fno-exceptions -fno-rtti"
$ export PKG_CONFIG_PATH=/usr/lib/pkgconfig:/usr/local/lib/pkgconfig

load sed, m4, bison, make, coreutils extensions

grep-2.5.4
----------
$ /tools/bin/patch -Np1 -i ../grep-2.5.4-debian_fixes-1.patch

$ ./configure --prefix=/usr/local --bindir=/usr/local/bin --without-included-regex
$ make
$ sudo make install-strip