Cherry-picked changes from master branch to make Unix build process compatible with contemporary versions of Automake and boost.

Author: c-lipka

unix/README

@@ -12,6 +12,14 @@ POV-Ray 3.7 source code.
 Source code package
 ===================
 
++----------------------------------------------------------------------------+
+| NOTE: If this file does not reside in the root directory of your POV-Ray   |
+| source package, you have received a platform-neutral package. In that case |
+| make sure to run the following command before you proceed:                 |
+|                                                                            |
+|   cd unix/ ; ./prebuild.sh ; cd ../                                        |
++----------------------------------------------------------------------------+
+
 This package contains the complete source code of POV-Ray for UNIX
 as well as its accompanying HTML documentation and supporting files.
 The package substructure is organized as follows:

unix/README.md

@@ -19,6 +19,8 @@ boost, zlib, libpng, libjpeg, libtiff, and openexr. We recommend you have the
 following packages pre-installed: 
 
     libboost-dev
+    libboost-date-time-dev
+    libboost-thread-dev
     zlib1g-dev
     libpng12-dev
     libjpeg8-dev
@@ -31,17 +33,17 @@ Generating configure and building the code
     % cd unix/
     % ./prebuild.sh
     % cd ../
-    % ./configure COMPILED_BY="your name <email@address>" 
+    % ./configure COMPILED_BY="your name <email@address>"
     % make
-    
+
 Note that the prebuild step will generate a few warnings as it still looks
 for some files no longer included in v3.7. This is harmless.
 
 Installing
 ==========
 
     % make install
-    
+
 This above installs POV-Ray under system-wide directories and needs root privileges.
 Installing as non-privileged user is also possible. By default (i.e. as root), 'make
 install' installs the following components: