The "help avoid accidental remote_protocol.x changes" commit 180d4b2b added a make check rule that tried using pdwtags from the dwarves package to protect against accidental remote_protocol.x changes. I installed dwarves package on Ubuntu 10.04 and make check fails for me now. The temporary file remote_protocol-structs-t is empty for me. It seems that pdwtags doesn't output the expected format for the embedded perl script. pdwtags output doesn't contain /* DD */ comments between the structs. A snippet from the pdwtags output looks like this: struct remote_nonnull_network { remote_nonnull_string name; /* 0 8 */ remote_uuid uuid; /* 8 16 */ /* size: 24, cachelines: 1 */ /* last cacheline: 24 bytes */ }; typedef struct remote_nonnull_network remote_nonnull_network; struct remote_nonnull_nwfilter { remote_nonnull_string name; /* 0 8 */ remote_uuid uuid; /* 8 16 */ /* size: 24, cachelines: 1 */ /* last cacheline: 24 bytes */ }; typedef struct remote_nonnull_nwfilter remote_nonnull_nwfilter; If i run pdwtags with the --verbose flag then the output looks like this: /* <44e> remote/remote_protocol.h:71 */ typedef struct remote_nonnull_domain remote_nonnull_domain; /* <459> remote/remote_protocol.h:73 */ struct remote_nonnull_network { remote_nonnull_string name; /* 0 8 */ remote_uuid uuid; /* 8 16 */ /* size: 24, cachelines: 1 */ /* last cacheline: 24 bytes */ }; /* <482> remote/remote_protocol.h:77 */ typedef struct remote_nonnull_network remote_nonnull_network; /* <48d> remote/remote_protocol.h:79 */ struct remote_nonnull_nwfilter { remote_nonnull_string name; /* 0 8 */ remote_uuid uuid; /* 8 16 */ /* size: 24, cachelines: 1 */ /* last cacheline: 24 bytes */ }; /* <4b6> remote/remote_protocol.h:83 */ typedef struct remote_nonnull_nwfilter remote_nonnull_nwfilter; Now there are "markers" that can be used for splitting, but they still differ from the expected format. The attached patch fixes this issue for me on Ubuntu, but I doubt that this can be the general solution. Matthias