LinuxQuestions.org - Cannot find curl-config in Ubuntu 13.04

I am installing package RCurl in R and getting an error

checking for curl-config... no
Cannot find curl-config
ERROR: configuration failed for package ‘RCurl’

I have tried to install libcurl on Ubuntu, but it doesn't solve my problem have some dependecies

sudo apt-get install libcurl4-gnutls-dev
The following information may help to resolve the situation:
The following packages have unmet dependencies:
libcurl4-gnutls-dev : Depends: libcurl3-gnutls (= 7.29.0-1ubuntu3.1) but 7.29.0-1ubuntu3.2 is to be installed
Depends: libldap2-dev but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

`locate curl config` gives me nothing:

locate curl-config
curl-config
The program 'curl-config' can be found in the following packages:
* libcurl4-gnutls-dev
* libcurl4-nss-dev
* libcurl4-openssl-dev

I went through some of the solution [RCurl][1] but it is working. Can you suggest or help in this direction. Thank you so much.

**Edit**

when i tried to install(Curl) from Ubuntu Software center got the same erroe message

**Package dependencies cannot be resolved**

This error could be caused by required additional software packages which are missing or not installable. Furthermore there could be a conflict between software packages which are not allowed to be installed at the same time.

> The following packages have unmet dependencies:

curl: Depends: libcurl3 (= 7.29.0-1ubuntu3.1) but 7.29.0-1ubuntu3.2 is to be installed
Depends: zlib1g (>= 1:1.1.4) but 1:1.2.7.dfsg-13ubuntu2 is to be installed

[1]: http://www.omegahat.org/RCurl/FAQ.html