Explain Meson in INSTALL

INSTALL

@@ -4,14 +4,21 @@
 
 To compile irssi you need:
 
-- glib-2.6 or greater
+- meson-0.49 build system with ninja-1.5 or greater
-- pkg-config
+- glib-2.28 or greater
 - openssl (for ssl support)
 - perl-5.6 or greater (for perl support)
 - terminfo or ncurses (for text frontend)
 
 For most people, this should work just fine:
 
+ meson Build
+ ninja -C Build
+ su
+ ninja -C Build install
+ 
+For the moment, autotools is also supported:
+
  ./autogen.sh     (for people who just cloned the repository)
  ./configure      (if this script already exists, skip ./autogen.sh)
  make
@@ -20,39 +27,45 @@ For most people, this should work just fine:
 
 configure options
 
+  These options can be given to meson or ./configure.
+  The first syntax is for meson, the 2nd for ./configure
+  
+  For a complete list of options, run
+   meson configure   /   ./configure --help
+
   --prefix
 
   Specifies the path where irssi will be installed.
   YES, you can install irssi WITHOUT ROOT permissions
   by using --prefix=/home/dir
 
-  --with-proxy
+  -Dwith-proxy=yes   /   --with-proxy
 
   Build the irssi proxy (see startup-HOWTO).
 
-  --with-perl=[yes|no|module]
+  -Dwith-perl=[yes|no]   /   --with-perl=[yes|no|module]
 
   Enable Perl support
   yes    enable builtin (default)
   no     disable
   module enable as module
 
-  --with-perl-lib=[site|vendor|DIR]
+  -Dwith-perl-lib=[site|vendor|DIR]   /   --with-perl-lib=[site|vendor|DIR]
 
   Specify installation dir for Perl libraries
   site   install in dir for site-specific modules (default)
   vendor install in dir for vendor-specific modules
   DIR    install in DIR
 
-  --with-socks
+  [N/A]   /   --with-socks
 
   Build with socks library
 
-  --with-bot
+  -Dwith-bot=yes   /   --with-bot
 
   Build irssi-bot
 
-  --without-textui
+  -Dwithout-textui=yes   /   --without-textui
 
   Build without text frontend