There are some problems when compiling kompozer on a 64-Bit system.
So I fixed the errors, and compiled it successfully and it works on my machine. (Intel Core2Duo).
I attached a diff-file, but >>caution<< it is a merged diff, from 2 diff-files.
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File Added: nsDragService-64.patch
Patch for 64-Bit compile with gcc-4.1
File Added: nsHttpConnectionMgr-64.patch
I splitted the patch in two files, so it should be no problem to apply them.