Unknown@Unknown-PC /cygdrive/c/AMBER
$ ./configure -cygwin gnu
Checking for updates...
AmberTools12 has 20 unapplied patches: 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33

There are patches available. Do you want to apply them now? [y/n] (Recommended Y)
y
Determining patches to download for AmberTools12
  Downloading bugfix.14
  Downloading bugfix.15
  Downloading bugfix.16
  Downloading bugfix.17
  Downloading bugfix.18
  Downloading bugfix.19
  Downloading bugfix.20
  Downloading bugfix.21
  Downloading bugfix.22
  Downloading bugfix.23
  Downloading bugfix.24
  Downloading bugfix.25
  Downloading bugfix.26
  Downloading bugfix.27
  Downloading bugfix.28
  Downloading bugfix.29
  Downloading bugfix.30
  Downloading bugfix.31
  Downloading bugfix.32
  Downloading bugfix.33

Applying AmberTools12 patches
Fatal Error: Cannot find the patch program.
Automatic patching failed! Check the errors before re-configuring

Unknown@Unknown-PC /cygdrive/c/AMBER
$