comment on

the module name for ithreads is "threads":

perl -e 'use threads; print "ok\n"'
[download]

As for the OP, in my ithreaded perl both "usethreads" & "useithreads" (and "usemultiplicity") are set. Maybe you need -Dusethreads and -Duseithreads (and -Dusemultiplicity) to compile perl with ithreads - I don't know for sure since I always do a ~~"manual"~~ interactive Configure.

Full output of my perl -V:

Summary of my perl6 (revision 5 version 8 subversion 8) configuration:
  Platform:
    osname=linux, osvers=2.6.14.20060105, archname=i686-linux-thread-m
+ulti
    uname='linux sepia 2.6.14.20060105 #1 preempt thu jan 5 15:32:33 c
+et 2006 i686 gnulinux '
    config_args='-D DEBUG'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=define use5005threads=undef useithreads=define usemulti
+plicity=define
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS 
+-fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -
+D_FILE_OFFSET_BITS=64',
    optimize='-O2',
    cppflags='-D_REENTRANT -D_GNU_SOURCE -DTHREADS_HAVE_PIDS -fno-stri
+ct-aliasing -pipe -I/usr/local/include'
    ccversion='', gccversion='3.3.5 (Debian 1:3.3.5-13)', gccosandvers
+=''
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=1
+2
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t',
+ lseeksize=8
    alignbytes=4, prototype=define
  Linker and Libraries:
    ld='cc', ldflags =' -L/usr/local/lib'
    libpth=/usr/local/lib /lib /usr/lib
    libs=-lnsl -ldb -ldl -lm -lcrypt -lutil -lpthread -lc
    perllibs=-lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
    libc=/lib/libc-2.3.6.so, so=so, useshrplib=false, libperl=libperl.
+a
    gnulibc_version='2.3.6'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
    cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'


Characteristics of this binary (from libperl): 
  Compile-time options: MULTIPLICITY PERL_IMPLICIT_CONTEXT
                        PERL_MALLOC_WRAP THREADS_HAVE_PIDS USE_ITHREAD
+S
                        USE_LARGE_FILES USE_PERLIO USE_REENTRANT_API
  Built under linux
  Compiled at Jun  1 2006 19:45:39
  @INC:
    /usr/local/lib/perl5/5.8.8/i686-linux-thread-multi
    /usr/local/lib/perl5/5.8.8
    /usr/local/lib/perl5/site_perl/5.8.8/i686-linux-thread-multi
    /usr/local/lib/perl5/site_perl/5.8.8
    /usr/local/lib/perl5/site_perl/5.8.6
    /usr/local/lib/perl5/site_perl/5.8.5/i686-linux-thread-multi
    /usr/local/lib/perl5/site_perl/5.8.5
    /usr/local/lib/perl5/site_perl
    .
[download]

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re^2: configuration options for local perl install with threads by Joost
in thread configuration options for local perl install with threads by tphyahoo

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