[Slackbuilds-users] Problem with libsigc++-2.2.9-i486-1_SBo.tgz

[Graham Lawrence]

Attempt to compile nzbget-0.7.0 failed in ./configure with message

configure: error: "libsigc++-2.0 header files not found"

So I got the dependencies, including libsigc++-2.2.9, and installed
them, apparently all good.
But compiling nzbget again failed at same place.  To check, I did

root at a:/usr/pkgs# ls
HandBrake-0.9.5-i686-1_SBo.tgz  libpar2-0.2-i486-1_SBo.tgz
libsigc++-2.2.9-i486-1_SBo.tgz
root at a:/usr/pkgs# installpkg  libsigc++-2.2.9-i486-1_SBo.tgz
Verifying package libsigc++-2.2.9-i486-1_SBo.tgz.
Installing package libsigc++-2.2.9-i486-1_SBo.tgz:
PACKAGE DESCRIPTION:
# libsigc++ (typesafe callback system for standard C++)
#
# libsigc++ implements a typesafe callback system for standard C++.
# It allows you to define signals and to connect those signals to any
# callback function, either global or a member function, regardless
# of whether it is static or virtual.
# It also contains adaptor classes for connection of dissimilar
# callbacks and has an ease of use unmatched by other C++ callback
# libraries. Libsigc++ is licensed under the GNU Library General
# Public License, LGPL.
#
Executing install script for libsigc++-2.2.9-i486-1_SBo.tgz.
Package libsigc++-2.2.9-i486-1_SBo.tgz installed.

root at a:/usr/pkgs# updatedb
root at a:/usr/pkgs# locate libsigc++-2*
/usr/pkgs/libsigc++-2.2.9-i486-1_SBo.tgz
root at a:/usr/pkgs# echo $PATH
/usr/local/sbin:/usr/sbin:/sbin:/usr/local/bin:/usr/bin:/bin:/usr/games:/usr/lib/java/bin:/usr/lib/kde4/libexec:/usr/lib/qt/bin
root at a:/usr/pkgs#

I'm not familiar with this process, but it seems to me there should
now be at least 2 occurrences of the name libsigc++-2* on my system,
one of them in the PATH?