No package 'libcurl' found

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http://ubuntuforums.org – I've the problem No package 'libcurl' found Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you may set the environment variables CURL_CFLAGS and CURL_LIBS to avoid the need to call pkg-config. I wanna install opkg and it's dependecy is libcurl I've already instaled libcurl3-deb and nuthin same error. I've to tell opkg not to search for libcurl but libcurl-3 but how do I manage it? I've added this repo deb http://security.ubuntu.com/ubuntu quantal-security main but nuthin happend and i followed the steps you gi (Hardware)