Comment 30 for bug 524366

The patch works for me.
I had a problem with the same expat-2,0.1.tar.gz file of the OP.

I have built up the Ubuntu .deb for Lucid as follows:
 * unpack orig tarball [1]
 * applied ubuntu diff [1]
 * applied Marcel's diff on changelog and inflate.c
 * dpkg-buildpackage -us -uc -nc

[1] from http://packages.ubuntu.com/source/lucid/gzip

To test it I did
cd build
 ./gzip -d --t /path/to/expat-2.0.1.tar.gz

exit status 0

(Note it important to use./gzip as ./gunzip is a script which uses the installed gzip).

My cpuinfo flags are as follows
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm xsave lahf_lm

System was Ubuntu Lucid, fully up-to-date as of Jun 25 11:17:29 UTC 2010.