Also some style cleanup.
Note that defining an empty-string variable *does* change the hash.
I would like to change this behaviour one day
(clean up attrs when compiling the derivation).
From https://lists.macosforge.org/pipermail/macports-dev/2011-July/015263.html:
5) Building with a compiler that doesn't support newer __builtins
If your port uses MacPorts compilers rather than the default compiler,
you may run into trouble with string functions. You'll see errors at
link time about undefined __builtin_* functions. If this happens, you
may want to compile with -D_FORTIFY_SOURCE=0 to tell the headers to
use unfortified versions which do not use compiler builtins.
From https://lists.macosforge.org/pipermail/macports-dev/2011-July/015263.html:
5) Building with a compiler that doesn't support newer __builtins
If your port uses MacPorts compilers rather than the default compiler,
you may run into trouble with string functions. You'll see errors at
link time about undefined __builtin_* functions. If this happens, you
may want to compile with -D_FORTIFY_SOURCE=0 to tell the headers to
use unfortified versions which do not use compiler builtins.
Aspell can only handle one dict-dir directive and currently we hardocde
that to
ASPELL_CONF="dict-dir $HOME/.nix-profile/lib/aspell"
This means that aspell doesn't work if it is installed to the system or
default nix profile -- it only works in the user profile.
With this change, aspell can be installed to any of the nix profiles. If
it is installed in more than one profile, the most "local" profile wins
(i.e. sysadmin can set up a default, users can override it).
Ditaa is a small command-line utility written in Java, that can convert
diagrams drawn using ascii art ('drawings' that contain characters that
resemble lines like | / - ), into proper bitmap graphics.
Homepage: http://ditaa.sourceforge.net/
This reduces code duplication, but more importantly means that the
DRI modules can be found by X enabling hardware acceleration.
Close#249; the PR also refers to more about DRI modules.
