There's a missing C library: curl.

C:\>ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.0.3
C:\>cabal --version
cabal-install version 0.10.2
using version 1.10.1.0 of the Cabal library
C:\>cabal install darcs
...
Configuring darcs-2.5.2...
Warning: Unknown extensions: NoMonoLocalBinds, NoMonoLocalBinds
setup.exe: Missing dependencies on foreign libraries:
* Missing (or bad) header file: curl/curl.h
* Missing C libraries: curl, curl
This problem can usually be solved by installing the system packages that
provide these libraries (you may need the "-dev" versions). If the libraries
are already installed but in a non-standard location then you can use the
flags --extra-include-dirs= and --extra-lib-dirs= to specify where they are.
If the header file does exist, it may contain errors that are caught by the
C
compiler at the preprocessing stage. In this case you can re-run configure
with the verbosity flag -v3 to see the error messages.
cabal: Error: some packages failed to install:
darcs-2.5.2 failed during the configure step. The exception was:
ExitFailure 1

Cheers,

Andrew Pennebaker
www.yellosoft.us

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Could you triage this one, Alexey?

Thanks!

-- 
Eric Kow <http://www.nltg.brighton.ac.uk/home/Eric.Kow>
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2011/4/29 Andrew Pennebaker <bugs@darcs.net>:
> There's a missing C library: curl.
>
> ...
> Configuring darcs-2.5.2...
> Warning: Unknown extensions: NoMonoLocalBinds, NoMonoLocalBinds
> setup.exe: Missing dependencies on foreign libraries:
> * Missing (or bad) header file: curl/curl.h
> * Missing C libraries: curl, curl
> This problem can usually be solved by installing the system packages that
> provide these libraries (you may need the "-dev" versions). If the libraries
> are already installed but in a non-standard location then you can use the
> flags --extra-include-dirs= and --extra-lib-dirs= to specify where they are.

Look like libcurl is not installed. Or is it? Note that you have to
install libcurl under MinGW to make it work, and provide the
additional paths to cabal. You can also build without curl (cabal
install -f-curl) at the cost of inferior networking performance.
There's a page on the wiki,
http://wiki.darcs.net/BuildingUnderWindows, feel free to check it
and/or edit it if it's missing something.

We talked on IRC the other day about making -f-curl the default on Windows 
so that darcs just works, albeit at the cost of the poor network 
performance. I'm inclined to make that change - any thoughts?

2011/4/29 Ganesh Sittampalam <bugs@darcs.net>:
> We talked on IRC the other day about making -f-curl the default on Windows
> so that darcs just works, albeit at the cost of the poor network
> performance. I'm inclined to make that change - any thoughts?

Looks like a good change to make, poorly performing darcs is better
than unbuildable darcs.  As for the users who can compile libcurl for
themselves, they probably know how to enable curl in darcs.

Best option: Check for libcurl. If it's there, build normally. If not, print
a warning and use -f-curl.

Cheers,

Andrew Pennebaker
www.yellosoft.us



On Fri, Apr 29, 2011 at 7:03 AM, Alexey Levan <bugs@darcs.net> wrote:

>
> Alexey Levan <exlevan@gmail.com> added the comment:
>
> 2011/4/29 Ganesh Sittampalam <bugs@darcs.net>:
> > We talked on IRC the other day about making -f-curl the default on
> Windows
> > so that darcs just works, albeit at the cost of the poor network
> > performance. I'm inclined to make that change - any thoughts?
>
> Looks like a good change to make, poorly performing darcs is better
> than unbuildable darcs.  As for the users who can compile libcurl for
> themselves, they probably know how to enable curl in darcs.
>
> __________________________________
> Darcs bug tracker <bugs@darcs.net>
> <http://bugs.darcs.net/issue2071>
> __________________________________
>

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I can confirm on this one. It seems better to disable it by default and 
maybe print an info message that the option is available if you have 
libcurl installed.