I've had this problem with my installation as well and solve it by using the Windows XP Service Pack 2 compatibility mode (selectable in the Properties window of the Cygwin setup.exe executable).
It installs fine now... hope it works out for you too.
Kevin Hilton-3 wrote:
Being using cygwin for years with XP, however when attempting to
install everything (every package as I usually do) on new Vista
computer, the installation script gets stuck during the post install
step.
During /etc/postinstall/gnuplot.sh the process hangs. Anyone else
find a problem with this???
Ive even cancelled the installation, manually deselected the gnuplot
package, but same thing happens.