Compiling gnome-vfs-2.5.2 on sparc solaris 8 with gcc-3.3.2, I get this:

/home/poshea/usr/bin/gcc -DHAVE_CONFIG_H -I. -I. -I.. -I.. -I.. -threads
-DORBIT2=1 -I/home/poshea/usr/include/glib-2.0
-I/home/poshea/usr/lib/glib-2.0/include -I/home/poshea/usr/include/gconf/2
-I/home/poshea/usr/include/orbit-2.0
-I/home/poshea/usr/include/bonobo-activation-2.0
-I/home/poshea/usr/include/libbonobo-2.0 -I/home/poshea/usr/include/libxml2
-DORBIT2=1 -I/home/poshea/usr/include/libbonobo-2.0
-I/home/poshea/usr/include/glib-2.0 -I/home/poshea/usr/lib/glib-2.0/include
-I/home/poshea/usr/include/orbit-2.0
-I/home/poshea/usr/include/bonobo-activation-2.0 -D_FILE_OFFSET_BITS=64
-D_BSD_SOURCE -D_GNU_SOURCE -D_LARGEFILE64_SOURCE
-D_POSIX_PTHREAD_SEMANTICS -D_REENTRANT -DG_DISABLE_DEPRECATED
-DDATADIR=\"/home/poshea/usr/share\" -DLIBDIR=\"/home/poshea/usr/lib\"
-DPREFIX=\"/home/poshea/usr\"
-DGNOMEVFS_LOCALEDIR=\"/home/poshea/usr/share/locale\"
-DSYSCONFDIR=\"/home/poshea/usr/etc\" -DG_LOG_DOMAIN=\"libgnomevfs\"
-I/home/poshea/usr/include -O3 -mcpu=ultrasparc -I/home/poshea/usr/include
-MT gnome-vfs-utils.lo -MD -MP -MF .deps/gnome-vfs-utils.Tpo -c
gnome-vfs-utils.c  -fPIC -DPIC -o .libs/gnome-vfs-utils.lo
gnome-vfs-utils.c: In function `gnome_vfs_get_volume_free_space':
gnome-vfs-utils.c:813: error: storage size of `statfs_buffer2' isn't known
gmake[3]: *** [gnome-vfs-utils.lo] Error 1
gmake[3]: Leaving directory
`/home/poshea/usr/source/gnome2.4/gnome-vfs-2.5.2/libgnomevfs'


It looks like #include <sys/statfs.h> is needed, but even after that, the
compile fails with this:

gnome-vfs-utils.c: In function `gnome_vfs_get_volume_free_space':
gnome-vfs-utils.c:816: error: too few arguments to function `statfs'
gnome-vfs-utils.c:824: error: structure has no member named `f_type'

The sys/statfs.h for Solaris 8 has this for statfs:

/*
 * Structure returned by statfs(2) and fstatfs(2).
 * This structure and associated system calls have been replaced
 * by statvfs(2) and fstatvfs(2) and will be removed from the system
 * in a near-future release.
 */

struct  statfs {
        short   f_fstyp;        /* File system type */
        long    f_bsize;        /* Block size */
        long    f_frsize;       /* Fragment size (if supported) */
        long    f_blocks;       /* Total number of blocks on file system */
        long    f_bfree;        /* Total number of free blocks */
        ino_t   f_files;        /* Total number of file nodes (inodes) */
        ino_t   f_ffree;        /* Total number of free file nodes */
        char    f_fname[6];     /* Volume name */
        char    f_fpack[6];     /* Pack name */
};


gnome-vfs hasn't compiled on Solaris since 2.4.0 (see bugs 124585, 126624)!