[Vm-dev] missing dependency ftp://.../libpng-1.6.29.tar.gz

[Ben Coman]

It funny when the system seems to fight back.
Just as I think I resolve my freetype build issues,
my Windows build started failing as follows...
> wget -q --no-check-certificate  -O
../../.thirdparty-cache/libpng-1.6.29.tar.gz
ftp://ftp.simplesystems.org/pub/libpng/png/src/libpng16/libpng-1.6.29.tar.gz
> make: *** [../third-party/Makefile.libpng:19:
../../.thirdparty-cache/libpng-1.6.29.tar.gz] Error 8

What I see at ftp://ftp.simplesystems.org/pub/libpng/png/src/libpng16/
is...
Name                           Size   Date Modified
libpng-1.6.34-LICENSE.txt    4.9 kB   29/09/2017, 08:00:00
libpng-1.6.34-README.txt      96 3B   29/09/2017, 08:00:00
libpng-1.6.34.tar.gz         1.4 MB   29/09/2017, 08:00:00
libpng-1.6.34.tar.gz.asc      819 B   29/09/2017, 08:00:00
libpng-1.6.34.tar.xz         975 kB   29/09/2017, 08:00:00
libpng-1.6.34.tar.xz.asc      819 B   29/09/2017, 08:00:00
lpng1634.7z                  734 kB   29/09/2017, 08:00:00
lpng1634.7z.asc               819 B   29/09/2017, 08:00:00
lpng1634.zip                 1.3 MB   29/09/2017, 08:00:00
lpng1634.zip.asc              819 B   29/09/2017, 08:00:00

So did version 1.6.29 exist yesterday but not today?
or am I going crazy?

Anyway, should our builds avoid referencing external resources not under
our control?  Or would it be be better to copy the required tar files to a
server our community controls, (either files.opensmalltalk.org or
file.pharo.org)?

Plus btw our makefiles should verify sha1 checksums of these downloaded
files via a field in the third-party/*spec files.

cheers -ben
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