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The attached patch is a fix to and is dependant on asciilifeform's dumpblock
corrected patch:

http://thebitcoin.foundation/ml/btc-dev/2015-June/000104.html

When `bitcoind` is built with:
asciilifeform_and_now_we_have_block_dumper_corrected_ \
2084dc0427590fef92f9de097b9045b1ac7cdac8.patch

[**snip**]
localhost src # ./bitcoind dumpblock 2
error: no response from server
[1]+  Segmentation fault      ./bitcoind
[**snip**]

Rebuilt after applying the attached patch:

mod6_fix_dumpblock_params.patch
SHA1 f63475abb08390a771a472da51b0bb728564c51a

[**snip**]
localhost src # ./bitcoind dumpblock 3 3.bin
true
localhost src # ./bitcoind dumpblock 4
error: {"code":-1,"message":"dumpblock <height> <filename>\nEmit the block \
 at <height> to <filename>."}
localhost src # ./bitcoind dumpblock
error: {"code":-1,"message":"dumpblock <height> <filename>\nEmit the block \
 at <height> to <filename>."}
localhost src # ./bitcoind dumpblock 5 5.bin 6 6.bin
error: {"code":-1,"message":"dumpblock <height> <filename>\nEmit the block \
at <height> to <filename>."}
[**snip**]
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