First install from svn fails silently on composer

• Usability

I just installed my first Tiki12 for a long time from svn.

I start sh setup.sh and after I follow all the default suggestions and I see no hint of anything wrong, when I go to the new site all it shows is:
Your Tiki is not completely installed because Composer has not been run to fetch package dependencies. You need to run 'sh setup.sh' from the command line. See http://dev.tiki.org/Composer for details.

Going back carefully through the setup messages for the purpose of this bug report, I see that there are actually messages about curl not being found, but they are impossible to spot because they don't stand out and they are immediately scrolled 24 lines !

For the record, this is what I see:

libs@giftbox:/www/tiki12.jmlibs.name/htdocs$ sh setup
setup-legacy.sh setup.sh
libs@giftbox:/www/tiki12.jmlibs.name/htdocs$ sh setup.sh

Tiki setup.sh - your options
====

c run composer and exit (recommended to be done first)

f fix (classic default) o open (classic option)
S clear screen

predefined Tiki Permission Check models:
----------------

1 paranoia
2 paranoia-suphp w suphp workaround
3 sbox W sbox workaround
4 mixed
5 worry 6 moreworry
7 pain 8 morepain
9 risky a insane

q quit x exit

There are some other commands recommended for advanced users only.
More documentation about this: http://doc.tiki.org/Permission+Check

Your choice c?
curl: not found
setup.sh: 455: setup.sh: curl: not found
We have failed to obtain the composer executable.
NB: Maybe you are behing a proxy, just export https_proxy variable and relaunch setup.sh
1) Download it from http://getcomposer.org
2) Store it in temp/

Tiki setup.sh - your options
====

c run composer and exit (recommended to be done first)

f fix (classic default) o open (classic option)
S clear screen

predefined Tiki Permission Check models:
----------------

1 paranoia
2 paranoia-suphp w suphp workaround
3 sbox W sbox workaround
4 mixed
5 worry 6 moreworry
7 pain 8 morepain
9 risky a insane

q quit x exit

There are some other commands recommended for advanced users only.
More documentation about this: http://doc.tiki.org/Permission+Check

This bug has been demonstrated on show2.tiki.org

Please demonstrate your bug on show2.tiki.org

This bug has been demonstrated on show.tikiwiki.org

Please demonstrate your bug on show.tikiwiki.org