before I post this, I have check in the hg repository and in the packages repository, but unfortunately I think the hg repository is down and can not access them. So I look at in packages repository any libpng-1.4.8 in there, but still a lot of packages in the repository using dependency libpng-1.2.44 or build dependency libpng-1.2.44-dev.
For example i run command:
$ ldd /usr/bin/slim
/usr/bin/slim:
linux-gate.so.1 => (0xffffe000)
libXft.so.2 => /usr/lib/libXft.so.2 (0xb777f000)
libX11.so.6 => /usr/lib/libX11.so.6 (0xb7684000)
libfreetype.so.6 => /usr/lib/libfreetype.so.6 (0xb761f000)
libXrender.so.1 => /usr/lib/libXrender.so.1 (0xb7617000)
libfontconfig.so.1 => /usr/lib/libfontconfig.so.1 (0xb75ef000)
libpng12.so.0 => /usr/lib/libpng12.so.0 (0xb75d2000)
libz.so.1 => /usr/lib/libz.so.1 (0xb75c1000)
libcrypt.so.1 => /lib/libcrypt.so.1 (0xb7590000)
libXmu.so.6 => /usr/lib/libXmu.so.6 (0xb757e000)
libjpeg.so.8 => /usr/lib/libjpeg.so.8 (0xb7554000)
librt.so.1 => /lib/librt.so.1 (0xb754b000)
libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0xb747f000)
libm.so.6 => /lib/libm.so.6 (0xb7459000)
libgcc_s.so.1 => /usr/lib/libgcc_s.so.1 (0xb7442000)
libc.so.6 => /lib/libc.so.6 (0xb72fe000)
libpthread.so.0 => /lib/libpthread.so.0 (0xb72e6000)
libexpat.so.1 => /usr/lib/libexpat.so.1 (0xb72c8000)
libxcb.so.1 => /usr/lib/libxcb.so.1 (0xb72b1000)
libXau.so.6 => /usr/lib/libXau.so.6 (0xb72ae000)
libXdmcp.so.6 => /usr/lib/libXdmcp.so.6 (0xb72a9000)
libdl.so.2 => /lib/libdl.so.2 (0xb72a5000)
libbz2.so.1.0 => /usr/lib/libbz2.so.1.0 (0xb7295000)
libXt.so.6 => /usr/lib/libXt.so.6 (0xb7252000)
libSM.so.6 => /usr/lib/libSM.so.6 (0xb724c000)
libuuid.so.1 => /lib/libuuid.so.1 (0xb7248000)
libICE.so.6 => /usr/lib/libICE.so.6 (0xb7235000)
libXext.so.6 => /usr/lib/libXext.so.6 (0xb7228000)
/lib/ld-linux.so.2 => /lib/ld-2.13.so (0xb7790000)
slim still using old libpng:
libpng12.so.0 => /usr/lib/libpng12.so.0 (0xb75d2000)
but no new packages or upgraded packages in repository using new libpng.
And for that I run command:
# tazpkg block libpng
# tazpkg recharge
# tazpkg upgrade
Yes just new gdbm package has upgraded.
