macOS utilities for creating .icns file are non-deterministic and
the resulting file has different checksum each time the file is
re-generated. We don't want this to influence reproducibility of
builds in the future.
Windows is missing necessary native utilities for generating .ico
files out of .png sources.
It's also easier to just copy generated file during snapshot build.
SVG icon as a source for other sizes, PNG icon 1024x1024 as source for
generating .icns file, and small 16x16 PNG icon.
Background circle uses size and colours recommended by Gnome HIG.
Versions of GNU make prior to verion 4 do not support
'define =' syntax, but do however support 'define' without
the equals operator. This commit removes the equals operator
to ensure this Makefile is compatible with older versions
of GNU make.
Reported and tested on Windows XP-MinGW with GNU make 3.81
by @ant-222; thank you!
This commit adds `wget` as a fall-back if `curl` fails.
Additionally, it lets the user override the curl and wget
arguments by passing `CURL_FLAGS="args"` and
`WGET_FLAGS="args"` to make.
If both curl and wget fail, it suggesting the user manually
fetch the files or try other curl or wget arguments.
