Updated README

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@@ -4,12 +4,64 @@ What?
 This is a fork of trayfreq which is intended to work on modern Archlinux systems (it'll probably work on other systems too).
 
 
+Building
+========
+Due to KISS, I don't tend to use ./configure scripts for relatively small programs.
+Instead, it's up to the user to check they have the right libraries.
+The sort of parameters you might pass to a ./configure can instead be passed to make.
+
+Important Note
+--------------
+Note that any parameters set here will be compiled into the programs.
+If you're installing to a temporary directory (e.g. building a package for a package manager) then don't set the prefix to the temporary directory as this will become hard-coded into the programs.
+Instead, set this when calling `make install`.
+
+Here's a list:
+
+* BINDIR to override default binary directory (`/usr/bin`) for trayfreq and trayfreq-set
+* PREFIX to prepend to BINDIR, LOCALE_DIR etc
+* LOCALE_DIR to override default of `/usr/share/locale`
+* SUDO to override default sudo program `/usr/bin/sudo`
+* MAKE to override default make program `make`
+* CC to override default compiler `gcc`
+* TRAYFREQ_SET to override default trayfreq-set program of `PREFIX/BINDIR/trayfreq-set`
+
+If you'd like a huge amount of debug information every time you run trayfreq or trayfreq-set, then set DEBUG to something, eg:
+
+	make all DEBUG=yeah
+
+
+An example build line for a system with binaries in `/usr/bin`:
+
+	make all
+
+
+Quick (extreme) example for nutty system with binaries at `/exec` and sudo `/exec/sodu`:
+
+	make all BINDIR=/exec SUDO=/exec/sodu
+
 
 Installation
 ============
-The basic installation's standard:
+If you're using ArchLinux, just jump over to the AUR, download and unpack the tarball, `cd` to the newly unpacked folder and run `makepkg`.
+
+For all other systems, you'll probably be compiling from source.
+In that case, `make install` will install the package, making the assumption that:
+
+* Binaries (trayfreq, trayfreq-set) will go in `/usr/bin`
+* Locale directory starts at `/usr/share/locale`
+* Your sysconfdir is `/etc` (can't currently be changed)
+* You're installing to `/`
+
+In general, a plain `make install` should work if you're installing straight to `/`, i.e. you're not building a package or anything.
+If you *are* building a package or installing to a special dir, then you might want something like this:
+
+	make install PREFIX=/path/to/package/temp/dir LOCALE_DIR=/usr/share/locale
 
-make install
+This will prefix **all** paths with `/path/to/package/temp/dir` while installing.
+LOCALE_DIR has to be overridden due to the stripping of `/usr/` from it when manually setting a prefix.
+**Check the command lines as they go past.**
+Now's the time to check that everything's going to go in the right place.
 
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