I don't know why some people are having trouble importing my bootstrap.dat file. ... Did anyone try on a proper OS?
I will try that with a fresh compilation of master on Ubuntu 17.10 (assuming for the sake of argument that it broadly qualifies as a proper OS)
It's close enough...

I just noticed that the sum of the sizes of my blk* files is *exacly* the size of the bootstrap.dat I imported:
-rw------- 1 user user 2097155946 May 18 20:10 blk0001.dat
-rw------- 1 user user 467920500 May 19 03:43 blk0002.dat
-rw-rw-r-- 1 user user 2565076446 May 18 00:08 bootstrap.dat.old
I still have "connect=0" in the clam.conf, so it hasn't had a chance to find any blocks newer than the ones in the bootstrap.
Edit: it turns out the two blk files put end to end are identical to the bootstrap file:
~/.clam$ head -c 2097155946 bootstrap* | sha256sum
510d0cabb4208d9a545a0e05fab2c0c29c225d699e0601a16b2891facbd2ce98 -
~/.clam$ sha256sum blk*1*
510d0cabb4208d9a545a0e05fab2c0c29c225d699e0601a16b2891facbd2ce98 blk0001.dat
~/.clam$ tail -c 467920500 bootstrap* | sha256sum
a2d30d536d57eab41d930e2f8d753e60d4af83c1d1fe5dad6c7f5c39475b3d42 -
~/.clam$ sha256sum blk*2*
a2d30d536d57eab41d930e2f8d753e60d4af83c1d1fe5dad6c7f5c39475b3d42 blk0002.dat