it seems this package is still broken for sparc ( sparc32 at least.. haven't tried on sparc64)
ra1# tail /usr/pkg/etc/pkgin/repositories.conf
#
# Remote http repository
#
#
# Local repository (must contain a pkg_summary.gz or bz2)
#
# file:///usr/pkgsrc/packages/All
ra1#
ra1# pkgin install htop
calculating dependencies... done.
/usr/lib/libmenu.so.5, needed by ncurses-5.9 is not present in this system.
/usr/lib/libform.so.5, needed by ncurses-5.9 is not present in this system.
nothing to upgrade.
7 packages to be installed: pcre-8.32 libffi-3.0.11nb1 libelf-0.8.13 glib2-2.34.3 ncursesw-5.9 desktop-file-utils-0.21 htop-1.0.1 (1276K to download, 45M to install)
the following packages have unmet requirements: ncurses-5.9
proceed ? [Y/n] Y
downloading packages...
installing packages...
installing pcre-8.32..
installing libffi-3.0.11nb1...
installing libelf-0.8.13...
installing glib2-2.34.3...
No schema files found: doing nothing.
installing ncursesw-5.9...
installing desktop-file-utils-0.21...
installing htop-1.0.1...
pkg_install warnings: 0, errors: 3
pkg_install error log can be found in /var/db/pkgin/pkg_install-err.log
reading local summary...
processing local summary...
updating database: 100%
marking htop-1.0.1 as non auto-removable
ra1#
ra1# tail -20 /var/db/pkgin/pkg_install-err.log
---Aug 16 20:07:06: removing desktop-file-utils-0.21...
---Aug 16 20:07:08: removing ncursesw-5.9...
---Aug 16 20:07:09: removing glib2-2.34.3...
---Aug 16 20:07:54: removing libelf-0.8.13...
---Aug 16 20:07:55: removing libffi-3.0.11nb1...
---Aug 16 20:07:56: removing pcre-8.32...
---Aug 16 20:13:59: installing pcre-8.32...
---Aug 16 20:14:08: installing libffi-3.0.11nb1...
---Aug 16 20:14:11: installing libelf-0.8.13...
---Aug 16 20:14:12: installing glib2-2.34.3...
---Aug 16 20:15:14: installing ncursesw-5.9...
pkg_add: no pkg found for 'ncurses-5.9{,nb*}', sorry.
pkg_add: Can't install dependency ncurses-5.9{,nb*}, continuing
pkg_add: no pkg found for 'ncurses-5.9{,nb*}', sorry.
pkg_add: Can't install dependency ncurses-5.9{,nb*}, continuing
pkg_add: no pkg found for 'ncurses>=5.4nb1', sorry.
pkg_add: Can't install dependency ncurses>=5.4nb1, continuing
---Aug 16 20:15:17: installing desktop-file-utils-0.21...
The databases in [/usr/pkg/share/applications] could not be updated.
---Aug 16 20:15:20: installing htop-1.0.1...
ra1#