Update to version 1.6.1.  The relevant ChangeLog entries follow:
Bump BUILDLINK_ABI_DEPENDS according to library version.

  Changes between 1.6.1 and 1.6.2 (21-Feb-2008 to 04-Jul-2008)

  o Adjust "devtool.func" for latest GNU Libtool compatibility.
    [Ralf S. Engelschall]

  o Consistently annotate "RFC-XXXX" with "IETF" to clearly
    indicate from which standards body this comes from.
    [Ralf S. Engelschall]

  o Resolve namespace conflicts of recently introduced time_xxx()
    functions by using a propoer "uuid_" prefix.
    [Ralf S. Engelschall]

  o Remove unused "struct timezone" from time_gettimeofday() in
    order to simplify portability.
    [Ralf S. Engelschall]

  o Add support for POSIX clock_gettime(3) in case the Unix/POSIX
    gettimeofday(3) is not available.
    [Ralf S. Engelschall]

  o Upgrade build environment to GNU autoconf 2.62.
    [Ralf S. Engelschall]

  o Upgrade build environment to GNU libtool 2.2.4.
    [Ralf S. Engelschall]

  Changes between 1.6.0 and 1.6.1 (19-May-2007 to 21-Feb-2008)

  o Fix __VA_COPY_USE_{CSP,CPP} fallback macros for va_copy.
    [Mark A. Lindner <mark.a.lindner@gmail.com>]

  o PostgreSQL bindings: use SET_VARSIZE() instead
    of assigning to bytea->v_len under PostgreSQL >= 8.3
    [Ralf S. Engelschall]

(bjs)