问题
Where do I find it and how do I install it?
Thanks
Follow-up:
I did use the full installation and this specific file is not there.
回答1:
In my installation, it's in the CygWin bin directory, and that's a full install with no external stuff. You should ensure that you did a full install of your CygWin. I've had enough troubles before with partial installs to ensure I never try them again.
Based on your update where you state that you did a full install, I can only suggest you try it again. As I said, I did a full install and that file is there in the CygWin bin directory.
Do the full install and immediately check for the existence of the file (you can also try to install just the Net and/or Web packages but, as I said, I don't trust partial installs).
I suppose it's possible that Windows or some security package may have removed it as a threat but it depends entirely on what you're running. By checking immediately after install, you can hopefully track down if that's the case. If it's there after full install and not there a day later, you'll know something funny is going on.
And, if it's still there after a couple of weeks, well, you've solved the problem although, like may others, I'd prefer to know the root cause behind the original problem. But I'd be at least moderately happy if the problem just went away :-)
Just ensure that you click on the "rotating arrows" icon on the All package until it says Install. And I'd also suggest doing it with the latest setup.exe from the CygWin site (temporarily renaming your current directory if you want to be able to recover it). The install I did was only about a week ago.
回答2:
I had the same problem.
I installed curl by using setup-x86.exe on a 64 bit Windows 8.1 machine (run setup-x86.exe, search for curl, install Net curl: Multi....)
To fix it I just re-ran the installer and searched for curl and installed Libs libcurl4.... (you can just run the installer and search for libcurl4)
回答3:
If you tried installing curl via setup.exe and you still don't see cygcurl-4.dll in the output of "ls /bin | grep curl", then chances are pretty good that you're using the wrong terminal. If you have a 64-bit machine and you're using setup-x86.exe, you will run into this problem. Instead, you need to use the 64-bit version of Cygwin, which is setup-x86_64.exe.
If you're not convinced, here's the output from x86, and the output from x86-64, even when I tried installing curl on both versions:
x86:
$ ls /bin | grep curl
curl.exe
cygcurl-3.dll
x86_64:
$ ls /bin | grep curl
curl.exe
cygcurl-4.dll
来源：https://stackoverflow.com/questions/4803218/cygwin-on-win7-problem-could-not-use-curl-because-cygcurl-4-dll-is-missing