Add a few more details on what one might need. make and a development

environment were a part of a Unix operating systems, but these days
you see an increasing number of installations that do not necessarely
have these crucial parts by default, so it's needs mentioning.

INSTALL

@@ -7,8 +7,11 @@
 
  To install OpenSSL, you will need:
 
+  * make
   * Perl 5
   * an ANSI C compiler
+  * a development environment in form of development libraries and C
+    header files
   * a supported Unix operating system
 
  Quick Start