The maildir plugin cannot be compiled with Claws 3.17.5 anymore: In file included from /usr/lib/x86_64-linux-gnu/glib-2.0/include/glibconfig.h:11, from /usr/include/glib-2.0/glib/gtypes.h:32, from /usr/include/glib-2.0/glib/galloca.h:32, from /usr/include/glib-2.0/glib.h:30, from plugin.c:24: /usr/include/limits.h:124:26: error: no include path in which to search for limits.h 124 | # include_next <limits.h>
The maildir plugin became unsupported and was removed from the repo many years ago
Christian, not sure which plugin source are you using, but this one should work: https://git.claws-mail.org/readonly/maildir-plugin.git
I'm using git://git.claws-mail.org/maildir-plugin.git
It's the same :) BTW, the error you pasted on initial post has nothing to do with the plugin, seems some bug on GLib includes. Latest master builds fine here (Debian 10, Claws Mail git).
It was a problem with Debian unstable's updates. This problem is fixed today after an update.