After loading the following extensions:
nss-nspr, nss-nspr-devs, gtk2, gtk2-devs, Xorg-7.4-dev, Xlibs_support, pango, pango-devs, graphics-libs-1, graphics-libs-1-devs, expat2, expat2-devs, libxml2, glib2, glib2-dev, cairo, cairo-devs, libxml2-devs, pixman, pixman-devs, fontconfig, fontconfig-devs, atk, atk-devs, perl5, intltool-0.40.5, gettext-0.17 and perl_xml_parser
pidgin-2.6.3 compiled like this: $ ./configure --prefix=/usr/local --disable-startup-notification --disable-gtkspell --disable-gstreamer
--disable-vv --disable-idn --disable-meanwhile --disable-avahi --disable-dbus --disable-tcl --disable-perl
$ sudo ln -s /usr/local/include/nspr/* /usr/local/include
$ sudo ln -s /usr/local/include/nss/* /usr/local/include
$ make
$ sudo make install-strip
..without errors