Non exhaustive list of cygwin packages I had installed before compiling root (Dev version 4.00/06a)
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*****In terms of cygwin's ordering :

Base : all packages
Devel: binutils, gcc, gcc-g++, libiconv, make, mingw-runtime, w32api
Libs : libiconv, libiconv2, libintl, libintl1, libintl2
X11  : xorg-x11-base, xorg-x11-bin, xorg-x11-bin-dlls, xorg-x11-devel, xorg-x11-func, xorg-x11-fonts, xorg-x11-xwin, xorg-x11-etc


*****In terms of alphabetical ordering (except BASE contents):

binutils
gcc
gcc-g++
libiconv
libiconv2
libintl
libintl1
libintl2
make
mingw-runtime
w32api
xorg-x11-base
xorg-x11-bin
xorg-x11-bin-dlls
xorg-x11-devel
xorg-x11-etc
xorg-x11-func
xorg-x11-fonts
xorg-x11-xwin