/usr/include/c-client/linkage.h is in libc-client2007e-dev 8:2007f~dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | extern DRIVER mboxdriver;
extern DRIVER imapdriver;
extern DRIVER nntpdriver;
extern DRIVER pop3driver;
extern DRIVER mixdriver;
extern DRIVER mxdriver;
extern DRIVER mbxdriver;
extern DRIVER tenexdriver;
extern DRIVER mtxdriver;
extern DRIVER mhdriver;
extern DRIVER mmdfdriver;
extern DRIVER unixdriver;
extern DRIVER newsdriver;
extern DRIVER philedriver;
extern DRIVER dummydriver;
extern AUTHENTICATOR auth_gss;
extern AUTHENTICATOR auth_ext;
extern AUTHENTICATOR auth_md5;
extern AUTHENTICATOR auth_pla;
extern AUTHENTICATOR auth_log;
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