Okay, I tested with clean installed oneiric Beta2, problem still exists.
The suspect is pkgbinarymangler::pkgstripfiles(::optipng).
pkgbinarymangler kicked at build-process in only archive-build[1].  We
built at PPA/private pbuilder,  pkgstripfiles does not kicked[2] and
that works fine.

Collateral evidence:
When you install good fontforge packegs from my PPA[3], exec below 
command...problem reproduced!  Breaker is optipng (of cource, fontforges PNG 
reader is still suspicous, and we need workaround). 
  <<<WARNING: Before exec, please backup *png files>>>
 $ cd /usr/share/fontforge/pixmaps/
 $ sudo optipng -o4 -preserve *png

So, we have to one-more-rebuild with NO_PNG_PKG_MANGLE for good
fontforge packages.

# But, we are in FinalFreeze :(

[1] 
https://launchpadlibrarian.net/81558874/buildlog_ubuntu-oneiric-i386.fontforge_0.0.20110222-1build1_BUILDING.txt.gz
[2] 
https://launchpadlibrarian.net/81653514/buildlog_ubuntu-oneiric-i386.fontforge_0.0.20110222-1build2%7Eppa1_BUILDING.txt.gz
[3] https://launchpad.net/~hito/+archive/ppa/+packages

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https://bugs.launchpad.net/bugs/805752

Title:
  fontforge crashed with SIGSEGV in GImageRead_Png(): no change rebuild
  required

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