diff --git a/patches/poseidon/poseidon_lib.sfd.diff b/patches/poseidon/poseidon_lib.sfd.diff
new file mode 100644
index 0000000..063eb69
--- /dev/null
+++ b/patches/poseidon/poseidon_lib.sfd.diff
@@ -0,0 +1,9 @@
+--- PoseidonDeveloper/includes/poseidon_lib.sfd	2022-10-03 22:47:55.159541145 +0200
++++ PoseidonDeveloper/includes/poseidon_lib.sfd	2022-10-03 22:47:13.111235537 +0200
+@@ -1,5 +1,6 @@
+ ==id $Id: poseidon_lib.sfd 1.2 2002/08/02 12:44:47 hodges Exp $
+ ==base _PsdBase
++==libname poseidon.library
+ ==bias 30
+ ==public
+ ==include <exec/types.h>
diff --git a/patches/poseidon/usbclass_lib.sfd.diff b/patches/poseidon/usbclass_lib.sfd.diff
new file mode 100644
index 0000000..34ca9b3
--- /dev/null
+++ b/patches/poseidon/usbclass_lib.sfd.diff
@@ -0,0 +1,9 @@
+--- PoseidonDeveloper/includes/usbclass_lib.sfd	2002-09-08 21:12:38.000000000 +0200
++++ PoseidonDeveloper/includes/usbclass_lib.sfd	2022-10-03 22:55:51.279001616 +0200
+@@ -1,5 +1,6 @@
+ ==id $Id: usbclass_lib.sfd 1.1 2002/03/02 12:44:47 hodges Exp $
+ ==base _UsbClsBase
++==libname usbclass.library
+ ==bias 30
+ ==public
+ ==include <exec/types.h>
diff --git a/sdk/poseidon.sdk b/sdk/poseidon.sdk
new file mode 100644
index 0000000..a571f55
--- /dev/null
+++ b/sdk/poseidon.sdk
@@ -0,0 +1,30 @@
+Short: poseidon usb stack
+Version: 1.31
+Url: https://dump.platon42.de/files/PoseidonDev.lha
+
+patch : poseidon_lib.sfd.diff
+patch : usbclass_lib.sfd.diff
+
+PoseidonDeveloper/lowlevel.doc
+PoseidonDeveloper/poseidon.doc
+PoseidonDeveloper/usbclass.doc
+PoseidonDeveloper/usbhardware.doc
+PoseidonDeveloper/includes/clib/poseidon_protos.h
+PoseidonDeveloper/includes/clib/usbclass_protos.h
+PoseidonDeveloper/includes/devices/nsd.h
+PoseidonDeveloper/includes/devices/usb.h
+PoseidonDeveloper/includes/devices/usbhardware.h
+PoseidonDeveloper/includes/fd/poseidon_lib.fd
+PoseidonDeveloper/includes/fd/usbclass_lib.fd
+PoseidonDeveloper/includes/libraries/lowlevel_ext.h
+PoseidonDeveloper/includes/libraries/poseidon.h
+PoseidonDeveloper/includes/libraries/usbclass.h
+PoseidonDeveloper/includes/pragmas/poseidon_pragmas.h
+PoseidonDeveloper/includes/pragmas/usbclass_pragmas.h
+PoseidonDeveloper/includes/proto/poseidon.h
+PoseidonDeveloper/includes/proto/usbclass.h
+PoseidonDeveloper/includes/poseidon_lib.sfd = poseidon.sfd
+PoseidonDeveloper/includes/usbclass_lib.sfd = usbclass.sfd
+
+sfdc : poseidon.sfd
+sfdc : usbclass.sfd