From: Mikhail Zotov on
Many of those who compile TeX Live do probably use an excellent
SlackBuild script by Robby Workman, available at slackbuilds.org and
a number other places. Unfortunately, it does not work on the -current
branch after the latest updates. Compilation breaks with an error message
like

pngimage.c:(.text+0x24c): undefined reference to `png_check_sig'

The problem can be fixed with a patch similar to one of the patches
used for building teTeX. The patch is available here:

http://slackworld.berlios.de/2010/texlive.png14.patch

To employ it, just insert a line like

cat $CWD/texlive.png14.patch | patch -p1 --verbose || exit 1

somewhere just below the first "chmod -R a-s ." in Robby's script.

--
Mikhail