Minor updates to the build documentation.

README.txt

@@ -1,4 +1,7 @@
-% Allegro 5.0.0 RC1
+% Allegro 5
+
+Overview
+========
 
 Welcome to Allegro 5, a cross-platform game programming library.
 Currently supported platforms are Linux/Unix, Windows, MacOS X and iPhone.
@@ -50,17 +53,17 @@ those, nothing will work.  These are required for the core library:
   <http://www.g-productions.net/list.php?c=files_devpak>
 
 - X11 development libraries (Linux/Unix only)
-  The libraries will be part of you Linux distribution, but you may have to
+  The libraries will be part of your Linux distribution, but you may have to
   install them explicitly.
 
-- OpenGL development libraries (except on Windows)
+- OpenGL development libraries (optional only on Windows)
 
 The addons, too, may require additional libraries.  Since the addons are
 strictly optional, they are not required to build Allegro, but a lot of
 functionality may be disabled if they are not present.
 
-Windows users may find some precompiled binaries from
-<http://gnuwin32.sourceforge.net/>.  You need to get the `bin` and `lib`
+Windows users may find some precompiled binaries for the additional libraries
+from <http://gnuwin32.sourceforge.net/>.  You need to get the `bin` and `lib`
 packages.  The `bin` packages contain DLLs, and the `lib` packages contain the
 headers and import libraries.
 
@@ -77,13 +80,21 @@ These are the dependencies required for the addons:
   Home page: <http://www.libpng.org/pub/png/>
   Windows binaries: <http://gnuwin32.sourceforge.net/packages/libpng.htm>
 
+  On Windows/Mac OS X/iPhone, PNG image support is available by using the
+  native facilities on the respective operating systems, so libpng is not
+  required.
+
 - libjpeg, for JPEG image support (Unix and older MinGW only)
   Home page: <http://www.ijg.org/>
   Windows binaries: <http://gnuwin32.sourceforge.net/packages/jpeg.htm>
 
+  On Windows/Mac OS X/iPhone, JPEG image support is available by using the
+  native facilities on the respective operating systems, so libjpeg is not
+  required.
+
 - FreeType, for TrueType font support.
   Home page: <http://freetype.sourceforge.net/>
-  Window binaries: <http://gnuwin32.sourceforge.net/packages/freetype.htm>
+  Windows binaries: <http://gnuwin32.sourceforge.net/packages/freetype.htm>
 
 - Ogg Vorbis, a free lossy audio format. (libogg, libvorbis, libvorbisfile)
   Home page: <http://www.vorbis.com/>

README_macosx.txt

@@ -1,3 +1,6 @@
+Mac OS X-specific notes
+=======================
+
 Building Allegro on Mac OS X is the same as on other Unix-like operating systems.
 See README_make.txt.  You may also use Xcode but that is not covered there.
 

README_make.txt

@@ -1,3 +1,6 @@
+Building Allegro with make
+==========================
+
 This document discusses building Allegro using CMake and GNU make from a
 terminal window.  This document applies to Unix-like operating systems such as
 Linux, and also Mac OS X and MinGW.
@@ -32,13 +35,13 @@ More examples:
 
         cmake .. -G "MSYS Makefiles"
 
-4. Now, if that step was successful you can run make to build Allegro.
-On MinGW your make might actually be called mingw32-make.
+4. Now, if that step was successful you can run `make` to build Allegro.
+On MinGW your make might actually be called `mingw32-make`.
 
         make
 
 Since multicore processors are common now, you might wish to speed that up by
-passing "-j<n>" option, where <n> is the number of parallel jobs to spawn.
+passing a "-j<n>" option, where <n> is the number of parallel jobs to spawn.
 
 
 5. You may optionally install Allegro into your system path with the install
@@ -48,7 +51,7 @@ target.
 
 MinGW users might need to set the MINGDIR environment variable first.
 
-The DESTDIR is supported, for staged installs.
+The DESTDIR variable is supported for staged installs.
 
         make install DESTDIR=/tmp/allegro-package
 

README_msvc.txt

@@ -1,3 +1,6 @@
+Building Allegro with MSVC
+==========================
+
 There are a lot of variations to the build process, but we will just stick with
 one to keep things simple.  If you know what you are doing, you can do
 something else.