Hi,

if you have an 64 bit Linux and you get an error about missing libraries, you may just missing their 32 bit versions.

On Ubuntu and it's variants, you install them by adding :i386 to the package name. You can determine the needed package by installing the command line tool dlocate and passing it the missing library if its 64 version is already installed on your system.

For example, on my Kubuntu 14.04 64 bit, there was libcurl.so.4 missing. I used these commands:

dlocate libcurl.so.4

output:
libcurl3:amd64: /usr/lib/x86_64-linux-gnu/libcurl.so.4.3.0
libcurl3:amd64: /usr/lib/x86_64-linux-gnu/libcurl.so.4

Thus, I learned that the library libcurl.so.4 is part of the package libcurl3, but currently only installed in its 64 bit version (amd64). So, I installed its 32 bit version:

sudo apt install libcurl3:i386

Mind the :i386 after the package name without any spaces. (You could also use apt-get or aptitude instead of apt at your discretion.)

This made BLACKHOLE run on my system. You may have to install more/other libraries depending which are already present on your system.

Cheers
V4V

The same to you! I highly appreciate your feedback. :)

On Arch Linux there is an additional step required.
Not only the 32bit libraries have to be installed but you also have to preload a compatibility library. So i replaced the ./"BLACKHOLE" in the start.sh with the following line:
LD_PRELOAD=/usr/lib32/libcurl-compat.so.4.5.0 ./"BLACKHOLE"
Otherwise it complains about the following error:
./BLACKHOLE: /usr/lib32/libcurl.so.4: version `CURL_OPENSSL_3' not found (required by ./BLACKHOLE)