I use hydrogen trunk version.
I compiled hydrogen on mageia 1 32 bits and installed hydrogen in a specific directory: /local/stow/hydrogen-devel

When I start hydrogen, some "non lethal" error messages are printed:

(E) Filesystem::check_permissions /local/stow/hydrogen-devel/share/hydrogen/data/gui.conf is not a file
Erreur XSDError dans file:///local/stow/hydrogen-devel/share/hydrogen/data/drumkits/GMkit/drumkit.xml, à la ligne 1, colonne 14 : No definition for element drumkit_info available.
Erreur XSDError dans file:///local/stow/hydrogen-devel/share/hydrogen/data/drumkits/TR808EmulationKit/drumkit.xml, à la ligne 1, colonne 14 : No definition for element drumkit_info available.
(E) XMLDoc::read XML document /local/stow/hydrogen-devel/share/hydrogen/data/drumkits/GMkit/drumkit.xml is not valid (/local/stow/hydrogen-devel/share/hydrogen/data/xsd/drumkit.xsd), loading may fail
(E) Legacy::load_drumkit loading drumkit with legacy code
(E) XMLDoc::read XML document /local/stow/hydrogen-devel/share/hydrogen/data/drumkits/TR808EmulationKit/drumkit.xml is not valid (/local/stow/hydrogen-devel/share/hydrogen/data/xsd/drumkit.xsd), loading may fail
(E) Legacy::load_drumkit loading drumkit with legacy code

Best regards,

YC