$ yaourt -S python2-leap_mail

==> Downloading python2-leap_mail PKGBUILD from AUR...
x .SRCINFO
x .gitignore
x PKGBUILD
python2-leap_mail 0.4.0-1  (2016-04-07 14:24)
( Unsupported package: Potentially dangerous ! )
==> python2-leap_mail dependencies:
 - python2-zope-interface (already installed)
 - python2-twisted (already installed)
 - python2-zope-proxy (already installed)
 - python2-service-identity (already installed)
 - python2-leap_pycommon (already installed)
 - python2-leap_keymanager (already installed)
 - python2-leap_soledad_client (building from AUR)


==> Continue building python2-leap_mail ? [Y/n]
==> -------------------------------------------
==>
==> Building and installing package
==> Install or build missing dependencies for python2-leap_mail:

==> Downloading python2-leap_soledad_client PKGBUILD from AUR...
x .SRCINFO
x .gitignore
x PKGBUILD
python2-leap_soledad_client 0.7.4-1  (2016-04-07 14:24)
( Unsupported package: Potentially dangerous ! )
==> WARNING: This PKGBUILD describes a split package.
==> Specific package options are unknown
==> python2-leap_soledad dependencies:
 - python2-u1db (already installed)
 - python2-oauth (already installed)
 - python2-leap_pycommon (already installed)


==> Continue building python2-leap_soledad_client ? [Y/n]
==> -----------------------------------------------------
==>
==> Building and installing package
==> This PKGBUILD provides " python2-leap_soledad_common python2-leap_soledad_client "
==> Install only python2-leap_soledad_client ? [Y/n]
==> ------------------------------------------------
==>
==> Making package: python2-leap_soledad 0.7.4-1 (Thu Apr 14 05:41:47 UTC 2016)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Downloading 0.7.4.tar.gz...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   123    0   123    0     0    135      0 --:--:-- --:--:-- --:--:--   135
100  534k  100  534k    0     0   200k      0  0:00:02  0:00:02 --:--:--  642k
==> Validating source files with sha256sums...
    0.7.4.tar.gz ... Passed
==> Extracting sources...
  -> Extracting 0.7.4.tar.gz with bsdtar
==> Entering fakeroot environment...
==> Starting package_python2-leap_soledad_client()...
running install
running build
got version from expanded variable {'version': '0.7.4', 'full': '2c5c7f58b796fc9f71c4279a2d3f5fa062ef2533'}
running build_py
creating build
creating build/lib
creating build/lib/leap
copying src/leap/__init__.py -> build/lib/leap
creating build/lib/leap/soledad
copying src/leap/soledad/__init__.py -> build/lib/leap/soledad
creating build/lib/leap/soledad/client
copying src/leap/soledad/client/sync.py -> build/lib/leap/soledad/client
copying src/leap/soledad/client/sqlcipher.py -> build/lib/leap/soledad/client
copying src/leap/soledad/client/shared_db.py -> build/lib/leap/soledad/client
copying src/leap/soledad/client/secrets.py -> build/lib/leap/soledad/client
copying src/leap/soledad/client/pragmas.py -> build/lib/leap/soledad/client
copying src/leap/soledad/client/interfaces.py -> build/lib/leap/soledad/client
copying src/leap/soledad/client/events.py -> build/lib/leap/soledad/client
copying src/leap/soledad/client/encdecpool.py -> build/lib/leap/soledad/client
copying src/leap/soledad/client/crypto.py -> build/lib/leap/soledad/client
copying src/leap/soledad/client/auth.py -> build/lib/leap/soledad/client
copying src/leap/soledad/client/api.py -> build/lib/leap/soledad/client
copying src/leap/soledad/client/adbapi.py -> build/lib/leap/soledad/client
copying src/leap/soledad/client/_version.py -> build/lib/leap/soledad/client
copying src/leap/soledad/client/__init__.py -> build/lib/leap/soledad/client
creating build/lib/leap/soledad/client/http_target
copying src/leap/soledad/client/http_target/support.py -> build/lib/leap/soledad/client/http_target
copying src/leap/soledad/client/http_target/send.py -> build/lib/leap/soledad/client/http_target
copying src/leap/soledad/client/http_target/fetch.py -> build/lib/leap/soledad/client/http_target
copying src/leap/soledad/client/http_target/api.py -> build/lib/leap/soledad/client/http_target
copying src/leap/soledad/client/http_target/__init__.py -> build/lib/leap/soledad/client/http_target
UPDATING build/lib/leap/soledad/client/_version.py
running install_lib
writing byte-compilation script '/tmp/tmpZy66hH.py'
/usr/bin/python2 -O /tmp/tmpZy66hH.py
removing /tmp/tmpZy66hH.py
running install_egg_info
running egg_info
creating src/leap.soledad.client.egg-info
writing requirements to src/leap.soledad.client.egg-info/requires.txt
writing src/leap.soledad.client.egg-info/PKG-INFO
writing namespace_packages to src/leap.soledad.client.egg-info/namespace_packages.txt
writing top-level names to src/leap.soledad.client.egg-info/top_level.txt
writing dependency_links to src/leap.soledad.client.egg-info/dependency_links.txt
writing manifest file 'src/leap.soledad.client.egg-info/SOURCES.txt'
reading manifest file 'src/leap.soledad.client.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no files found matching 'CHANGELOG'
writing manifest file 'src/leap.soledad.client.egg-info/SOURCES.txt'
running install_scripts
==> Tidying install...
  -> Purging unwanted files...
  -> Removing libtool files...
  -> Removing static library files...
  -> Compressing man and info pages...
  -> Stripping unneeded symbols from binaries and libraries...
==> Creating package "python2-leap_soledad_client"...
  -> Generating .PKGINFO file...
  -> Generating .MTREE file...
  -> Compressing package...
==> Leaving fakeroot environment.
==> Finished making: python2-leap_soledad 0.7.4-1 (Thu Apr 14 05:41:52 UTC 2016)
==> Exporting python2-leap_soledad to /var/cache/pacman/pkg/ directory

==> Continue installing python2-leap_soledad ? [Y/n]
==> [v]iew package contents [c]heck package with namcap
==> ---------------------------------------------------
==>

loading packages...
resolving dependencies...
warning: cannot resolve "python2-pysqlcipher", a dependency of "python2-leap_soledad_client"
warning: cannot resolve "python2-scrypt", a dependency of "python2-leap_soledad_client"
warning: cannot resolve "pycryptopp", a dependency of "python2-leap_soledad_client"
warning: cannot resolve "python2-leap_soledad_common", a dependency of "python2-leap_soledad_client"
:: The following package cannot be upgraded due to unresolvable dependencies:
      python2-leap_soledad_client

:: Do you want to skip the above package for this upgrade? [y/N]
error: failed to prepare transaction (could not satisfy dependencies)
:: python2-leap_soledad_client: requires python2-pysqlcipher
:: python2-leap_soledad_client: requires python2-scrypt
:: python2-leap_soledad_client: requires pycryptopp
:: python2-leap_soledad_client: requires python2-leap_soledad_common

#####################################################################
#####################################################################
#####################################################################

$ yaourt -S python2-pysqlcipher (install ok!)
$ yaourt -S python2-scrypt (install ok!)
$ yaourt -S python2-leap_soledad_common (install ok!)
$ yaourt -S pycryptopp (fail nok!)

==> Building and installing package
==> Making package: pycryptopp 0.6.0-2 (Thu Apr 14 05:54:29 UTC 2016)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Downloading pycryptopp-0.6.0.1206569328141510525648634803928199668821045408958.tar.gz...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 1962k  100 1962k    0     0   294k      0  0:00:06  0:00:06 --:--:--  395k
  -> Downloading pycryptopp-0.6.0.1206569328141510525648634803928199668821045408958.tar.gz.asc...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   198  100   198    0     0    193      0  0:00:01  0:00:01 --:--:--   193
==> Validating source files with sha256sums...
    pycryptopp-0.6.0.1206569328141510525648634803928199668821045408958.tar.gz ... Passed
    pycryptopp-0.6.0.1206569328141510525648634803928199668821045408958.tar.gz.asc ... Skipped
==> Verifying source file signatures with gpg...
    pycryptopp-0.6.0.1206569328141510525648634803928199668821045408958.tar.gz ... FAILED (unknown public key 5F22F428242BE85F)
==> ERROR: One or more PGP signatures could not be verified!
==> ERROR: Makepkg was unable to build pycryptopp.
==> Restart building pycryptopp ? [y/N]