Mention the cmake/OpenSSL compatibility issue.
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@
1671365 13f79535-47bb-0310-9956-
ffa450edef68
The following tools must be in PATH:
* cmake, version 2.8 or later
+ cmake version 3.1.3 or later is required to work with current OpenSSL
+ releases. (OpenSSL is an optional prerequisite of httpd.)
* Perl
* If the WITH_MODULES feature is used: awk
* If using a command-line compiler: compiler and linker and related tools