[horde] Horde_Crypt No valid packages found

[Thomas Heinemann]

No valid packages found for HordeCrypt when installing imp

[root at PC horde]# pear install -a -B horde/imp
horde/imp can optionally use PHP extension "openssl"
horde/Horde_Crypt requires PHP extension "openssl"
horde/imp requires package "horde/Horde_Crypt" (version >= 2.0.0,  
version <= 3.0.0alpha1, excluded versions: 3.0.0alpha1)
No valid packages found
install failed

What's going wrong
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