File gdbm.h misses sys/types.h include for type off_t. This leads to compilation errors, e.g. on SuSE Linux Enterprise 11 (SLES 11) and probably other older Linuxes:

gdbm.h:293: error: expected specifier-qualifier-list before 'off_t'

For newer Linux, like SLES 12, included file stdio.h includes

typedef __off_t off_t;

or

typedef __off64_t off_t;

and the types __off_t resp. __off64_t are defined in bits/types.h which is also included by stdio.h.

In old SLES 11 these typdefs aee missing and an inclusion of sys/types.h is needed. That inclusion should be POSIX conforming.

So I suggest to add

#include <sys/types.h>

to gdbm.h.

Thanks and regards,

Rainer