在debian上安装PHP时遇到的有关问题

在debian上安装PHP时遇到的问题
配置的时候出现了这样的错误：
Configuring extensions
checking for OpenSSL support... yes
checking for Kerberos support... no
checking for pkg-config... /usr/bin/pkg-config
checking for OpenSSL version... >= 0.9.6
checking for CRYPTO_free in -lcrypto... yes
checking for SSL_CTX_set_ssl_version in -lssl... yes
checking for PCRE support... yes
checking for ZLIB support... yes
checking if the location of ZLIB install directory is defined... no
checking for gzgets in -lz... yes
checking whether to enable bc style precision math functions... no
checking for BZip2 support... no
checking whether to enable calendar conversion support... no
checking for cpdflib support... no
checking for CRACKlib support... no
checking whether to enable ctype functions... yes
checking for CURL support... yes
checking for CURL in default path... not found
configure: error: Please reinstall the libcurl distribution -
easy.h should be in /include/curl/

然后我在网上找到一个解决办法：
#apt-get install curl
#apt-get install libcurl3
#apt-get install libcurl4-gnutls-dev

但是运行apt-get install libcurl4-gnutls-dev的时候又出现了错误：
# apt-get install libcurl4-gnutls-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
libcurl4-gnutls-dev: Depends: libcurl3-gnutls (= 7.18.2-8lenny4) but 7.19.5-1.1 is to be installed
Depends: libgnutls-dev but it is not going to be installed
Depends: libidn11-dev but it is not going to be installed
Depends: libkrb5-dev but it is not going to be installed or
hurd but it is not installable
Depends: libldap2-dev but it is not going to be installed