openssl/err.h: No such file or directory
Today i got this error while installing sslscan, sslscan needs the openssl-devel package or libssl-dev.
#1 Try to yum install libssl-dev
#2 Try to yum install openssl-dev
If you could not find any of these try to search for the missing files like below example:
yum provides */ssl.h
You will get the list of all packages which provide that file and then install it.