Make dependency upon libssh optional

Signed-off-by: Alexander Golubev <fatzer2@gmail.com>
(cherry picked from commit f2dbf5b903)

CMakeLists.txt

@@ -97,6 +97,7 @@ option( WITH_ALL_OPTIONS "Enable all optional support" OFF )
 option( WITH_SASL "Enable SASL support" ${WITH_ALL_OPTIONS} )
 option( WITH_LDAP "Enable LDAP support" ${WITH_ALL_OPTIONS} )
 option( WITH_SAMBA "Enable SAMBA support" ${WITH_ALL_OPTIONS} )
+option( WITH_SFTP "Enable SFTP support" ${WITH_ALL_OPTIONS} )
 option( WITH_OPENEXR "Enable openexr support" ${WITH_ALL_OPTIONS} )
 option( WITH_XCOMPOSITE "Enable xcomposite support" ${WITH_ALL_OPTIONS} )
 option( WITH_XCURSOR "Enable xcursor support" ${WITH_ALL_OPTIONS} )
@@ -130,6 +131,7 @@ option( WITH_GCC_VISIBILITY "Enable fvisibility and fvisibility-inlines-hidden"
 # WITH_SASL         affects tdeioslaves(tdeio_ldap tdeio_smtp tdeio_pop3)
 # WITH_LDAP         affects tdeioslaves(tdeio_ldap)
 # WITH_SAMBA        affects tdeioslaves(tdeio_samba) kcontrol
+# WITH_SFTP         affects tdeioslaves(tdeio_sftp)
 # WITH_OPENEXR      affects tdeioslaves(thumbnail)
 # WITH_XCOMPOSITE   affects twin kicker(taskmanager) tdm
 # WITH_XCURSOR      affects tdeioslaves(thumbnail), kcontrol(input), kdesktop

ConfigureChecks.cmake

@@ -100,7 +100,7 @@ if( BUILD_KSMSERVER OR BUILD_KSPLASHML OR BUILD_TDEIOSLAVES )
 endif( )
 
 # libssh (tdeioslave/sftp)
-if( BUILD_TDEIOSLAVES )
+if( BUILD_TDEIOSLAVES AND WITH_SFTP )
   pkg_search_module( LIBSSH libssh )
   if( NOT LIBSSH_FOUND )
     tde_message_fatal( "LibSSH is required, but was not found on your system" )

tdeioslave/CMakeLists.txt

@@ -23,7 +23,6 @@ add_subdirectory( nfs )
 add_subdirectory( nntp )
 add_subdirectory( pop3 )
 add_subdirectory( smtp )
-add_subdirectory( sftp )
 add_subdirectory( tar )
 add_subdirectory( finger )
 add_subdirectory( thumbnail )
@@ -35,3 +34,4 @@ add_subdirectory( home )
 add_subdirectory( system )
 tde_conditional_add_subdirectory( WITH_LDAP ldap )
 tde_conditional_add_subdirectory( WITH_SAMBA smb )
+tde_conditional_add_subdirectory( WITH_SFTP sftp )