OK, I see : the perl comments are included in the C source, and of course a line beginning with a # has unexpected effects there :) So adding a // in front of lines 137 and 164 saves the day:
perl test.pl
1..3
ok 1 - The first 501 primes are found from 1 to 3571.
ok 2 - external_cpp() function gives same results as basic_perl().
ok 3 - inline_c() function gives same results as basic_perl().
#
# Comparing basic_perl(), external_cpp(), and inline_c() for
# 5 seconds searching 150000 integers.
#
Rate basic_perl external_cpp inline_c
basic_perl 0.984/s -- -90% -96%
external_cpp 9.45/s 860% -- -58%
inline_c 22.6/s 2197% 139% --
#
# I love it when a plan comes together.
#
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