http_client.h:26:25: error: openssl/ssl.h: No such file or directory

I got this error while installing Skipfish on Centos

http_client.h:26:25: error: openssl/ssl.h:No such file or directory

Solution is to install the following packages
 yum install pcre-devel openssl-devel libidn-devel libidn2-devel

How to install skipfish on centos

Skipfish is a good tool for website vulnerability checking

Login to server
cd /opt
wget http://skipfish.googlecode.com/files/skipfish-1.01b.tgz
tar zxvf skipfish-1.01b.tgz
yum install pcre-devel openssl-devel libidn-devel libidn2-devel
cd skipfish
make
cp dictionaries/default.wl skipfish.wl
./skipfish -o output_folder http://www.example.com

you’ll want to less README to understand all the options.