Hi, guys
I have compiled seafile-client gui and seafile-cli for two versions of the Raspbian system Jessie and stretch, you can download at http://t.cn/RmtFlMZ.
# For stretch version, the jessie same too.
sudo dpkg -i libsearpc-3.0.0-1_armhf_rpi_stretch.deb
sudo dpkg -i ccnet_6.1.1-1_armhf_rpi_stretch.deb
sudo dpkg -i seafile_6.1.1-1_armhf_rpi_stretch.deb # seafile-cli, the command seafile client
sudo dpkg -i seafile-client_6.1.1-1_armhf_rpi_stretch.deb # seafile-client gui
For compile install way, you can visit stackexchange.
enjoy it~