installation impossible

Bonjour,
sous Mac 10,8,3, je ne parviens pas à installer Diacamma

ce message apparaît.
Last login: Mon Jan 9 13:26:53 on ttys002
pc36:~ mikasato$ /Users/mikasato/Desktop/install\ Diacamma.app/Contents/MacOS/install_Diacamma.command ; exit;
====== install lucterios #16040410 ======
install: packages=diacamma-asso diacamma-syndic lucterios-standard application_name=Diacamma

------ check perquisite -------

Error: undefined method >=' for nil:NilClass /usr/local/Homebrew/Library/Homebrew/extend/os/mac/development_tools.rb:72:in default_compiler’
/usr/local/Homebrew/Library/Homebrew/tab.rb:180:in empty' /usr/local/Homebrew/Library/Homebrew/tab.rb:151:in for_formula’
/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:437:in effective_build_options_for' /usr/local/Homebrew/Library/Homebrew/formula_installer.rb:417:in block in expand_dependencies’
/usr/local/Homebrew/Library/Homebrew/dependency.rb:110:in block in action' /usr/local/Homebrew/Library/Homebrew/dependency.rb:108:in catch’
/usr/local/Homebrew/Library/Homebrew/dependency.rb:108:in action' /usr/local/Homebrew/Library/Homebrew/dependency.rb:87:in block in expand’
/usr/local/Homebrew/Library/Homebrew/dependency.rb:84:in each' /usr/local/Homebrew/Library/Homebrew/dependency.rb:84:in expand’
/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:415:in expand_dependencies' /usr/local/Homebrew/Library/Homebrew/formula_installer.rb:333:in compute_dependencies’
/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:131:in verify_deps_exist' /usr/local/Homebrew/Library/Homebrew/formula_installer.rb:124:in prelude’
/usr/local/Homebrew/Library/Homebrew/cmd/install.rb:300:in install_formula' /usr/local/Homebrew/Library/Homebrew/cmd/install.rb:194:in block in install’
/usr/local/Homebrew/Library/Homebrew/cmd/install.rb:194:in each' /usr/local/Homebrew/Library/Homebrew/cmd/install.rb:194:in install’
/usr/local/Homebrew/Library/Homebrew/brew.rb:94:in <main>' Error: Git must be installed and in your PATH! Error: undefined method >=’ for nil:NilClass
/usr/local/Homebrew/Library/Homebrew/extend/os/mac/development_tools.rb:72:in default_compiler' /usr/local/Homebrew/Library/Homebrew/tab.rb:180:in empty’
/usr/local/Homebrew/Library/Homebrew/tab.rb:151:in for_formula' /usr/local/Homebrew/Library/Homebrew/formula_installer.rb:437:in effective_build_options_for’
/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:387:in block in expand_requirements' /usr/local/Homebrew/Library/Homebrew/requirement.rb:216:in block in prune?’
/usr/local/Homebrew/Library/Homebrew/requirement.rb:214:in catch' /usr/local/Homebrew/Library/Homebrew/requirement.rb:214:in prune?’
/usr/local/Homebrew/Library/Homebrew/requirement.rb:205:in block (2 levels) in expand' /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.0.0-p648/lib/ruby/2.0.0/set.rb:232:in each_key’
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.0.0-p648/lib/ruby/2.0.0/set.rb:232:in each' /usr/local/Homebrew/Library/Homebrew/dependencies.rb:68:in each’
/usr/local/Homebrew/Library/Homebrew/requirement.rb:204:in block in expand' /usr/local/Homebrew/Library/Homebrew/requirement.rb:203:in each’
/usr/local/Homebrew/Library/Homebrew/requirement.rb:203:in expand' /usr/local/Homebrew/Library/Homebrew/formula.rb:1516:in recursive_requirements’
/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:386:in expand_requirements' /usr/local/Homebrew/Library/Homebrew/formula_installer.rb:331:in compute_dependencies’
/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:131:in verify_deps_exist' /usr/local/Homebrew/Library/Homebrew/formula_installer.rb:124:in prelude’
/usr/local/Homebrew/Library/Homebrew/cmd/install.rb:300:in install_formula' /usr/local/Homebrew/Library/Homebrew/cmd/install.rb:194:in block in install’
/usr/local/Homebrew/Library/Homebrew/cmd/install.rb:194:in each' /usr/local/Homebrew/Library/Homebrew/cmd/install.rb:194:in install’
/usr/local/Homebrew/Library/Homebrew/brew.rb:94:in `’
error: can’t create or remove files in install directory

The following error occurred while trying to add or remove files in the
installation directory:

[Errno 13] Permission denied: '/Library/Python/2.7/site-packages/test-easy-install-2809.write-test'

The installation directory you specified (via --install-dir, --prefix, or
the distutils default setting) was:

/Library/Python/2.7/site-packages/

Perhaps your account does not have write access to this directory? If the
installation directory is a system-owned directory, you may need to sign in
as the administrator or “root” account. If you do not have administrative
access to this machine, you may wish to choose a different installation
directory, preferably one that is listed in your PYTHONPATH environment
variable.

For information on other options, you may wish to consult the
documentation at:

http://peak.telecommunity.com/EasyInstall.html

Please make the appropriate changes for your system and try again.

Error: undefined method >=' for nil:NilClass /usr/local/Homebrew/Library/Homebrew/extend/os/mac/development_tools.rb:72:in default_compiler’
/usr/local/Homebrew/Library/Homebrew/tab.rb:180:in empty' /usr/local/Homebrew/Library/Homebrew/tab.rb:151:in for_formula’
/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:437:in effective_build_options_for' /usr/local/Homebrew/Library/Homebrew/formula_installer.rb:417:in block in expand_dependencies’
/usr/local/Homebrew/Library/Homebrew/dependency.rb:110:in block in action' /usr/local/Homebrew/Library/Homebrew/dependency.rb:108:in catch’
/usr/local/Homebrew/Library/Homebrew/dependency.rb:108:in action' /usr/local/Homebrew/Library/Homebrew/dependency.rb:87:in block in expand’
/usr/local/Homebrew/Library/Homebrew/dependency.rb:84:in each' /usr/local/Homebrew/Library/Homebrew/dependency.rb:84:in expand’
/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:415:in expand_dependencies' /usr/local/Homebrew/Library/Homebrew/formula_installer.rb:333:in compute_dependencies’
/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:131:in verify_deps_exist' /usr/local/Homebrew/Library/Homebrew/formula_installer.rb:124:in prelude’
/usr/local/Homebrew/Library/Homebrew/cmd/install.rb:300:in install_formula' /usr/local/Homebrew/Library/Homebrew/cmd/install.rb:194:in block in install’
/usr/local/Homebrew/Library/Homebrew/cmd/install.rb:194:in each' /usr/local/Homebrew/Library/Homebrew/cmd/install.rb:194:in install’
/usr/local/Homebrew/Library/Homebrew/brew.rb:94:in <main>' Error: Git must be installed and in your PATH! Error: undefined method >=’ for nil:NilClass
/usr/local/Homebrew/Library/Homebrew/extend/os/mac/development_tools.rb:72:in default_compiler' /usr/local/Homebrew/Library/Homebrew/tab.rb:180:in empty’
/usr/local/Homebrew/Library/Homebrew/tab.rb:151:in for_formula' /usr/local/Homebrew/Library/Homebrew/formula_installer.rb:437:in effective_build_options_for’
/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:417:in block in expand_dependencies' /usr/local/Homebrew/Library/Homebrew/dependency.rb:110:in block in action’
/usr/local/Homebrew/Library/Homebrew/dependency.rb:108:in catch' /usr/local/Homebrew/Library/Homebrew/dependency.rb:108:in action’
/usr/local/Homebrew/Library/Homebrew/dependency.rb:87:in block in expand' /usr/local/Homebrew/Library/Homebrew/dependency.rb:84:in each’
/usr/local/Homebrew/Library/Homebrew/dependency.rb:84:in expand' /usr/local/Homebrew/Library/Homebrew/formula_installer.rb:415:in expand_dependencies’
/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:333:in compute_dependencies' /usr/local/Homebrew/Library/Homebrew/formula_installer.rb:131:in verify_deps_exist’
/usr/local/Homebrew/Library/Homebrew/formula_installer.rb:124:in prelude' /usr/local/Homebrew/Library/Homebrew/cmd/install.rb:300:in install_formula’
/usr/local/Homebrew/Library/Homebrew/cmd/install.rb:194:in block in install' /usr/local/Homebrew/Library/Homebrew/cmd/install.rb:194:in each’
/usr/local/Homebrew/Library/Homebrew/cmd/install.rb:194:in install' /usr/local/Homebrew/Library/Homebrew/brew.rb:94:in
/Users/mikasato/Desktop/install Diacamma.app/Contents/MacOS/install_Diacamma.command: line 72: pip3: command not found

------ configure virtual environment ------

No pip found!
logout

[Opération terminée]

pOuvez-vous m’aider svp?
cordialement,
Mika

Bonsoir,
Vous n’êtes pas le premier à nous remonter des soucis d’installation sous macOS.
On prévois de refaire une installation plus simple, merci de votre patience.

Bonjour,
Moi j’ai ce message au début de l’installation:

Warning: libxml2 is a keg-only and another version is linked to opt.
Use brew install --force if you want to install this version
Warning: libxslt is a keg-only and another version is linked to opt.
Use brew install --force if you want to install this version
Warning: jpeg-8d already installed
Warning: giflib-4.2.3 already installed
Error: libpng-1.6.28 already installed
To install this version, first brew unlink libpng
Error: libtiff-4.0.7_1 already installed
To install this version, first brew unlink libtiff
error: can’t create or remove files in install directory

The following error occurred while trying to add or remove files in the
installation directory:

[Errno 13] Permission denied: '/Library/Python/2.7/site-packages/test-easy-install-1862.pth'

The installation directory you specified (via --install-dir, --prefix, or
the distutils default setting) was:

/Library/Python/2.7/site-packages/

Perhaps your account does not have write access to this directory? If the
installation directory is a system-owned directory, you may need to sign in
as the administrator or “root” account. If you do not have administrative
access to this machine, you may wish to choose a different installation
directory, preferably one that is listed in your PYTHONPATH environment
variable.

For information on other options, you may wish to consult the
documentation at:

https://pythonhosted.org/setuptools/easy_install.html

Please make the appropriate changes for your system and try again.

Error: python3-3.6.0 already installed
To install this version, first brew unlink python3
Requirement already up-to-date: pip in /usr/local/lib/python3.6/site-packages