vad@p100 ~ $ perl -Mthreads -we 1 This Perl not built to support threads Compilation failed in require. BEGIN failed--compilation aborted. vad@p100 ~ $ perl -V Summary of my perl5 (revision 5 version 13 subversion 11) configuration: Snapshot of: c0331f4216be1694777ceb04d36e300210e71ef9 Platform: osname=linux, osvers=2.6.28-tuxonice-r11, archname=i686-linux uname='linux p100 2.6.28-tuxonice-r11 #20 preempt sun feb 14 14:58:37 moscow 2010 i686 amd athlon(tm) 64 processor 3000+ authenticamd gnulinux ' config_args='-de -Dusedevel -Dusemymalloc -Uusethreads -Dprefix=/opt/perl-5.13.11-357-d -DDEBUGGING' hint=recommended, useposix=true, d_sigaction=define useithreads=undef, usemultiplicity=undef useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef use64bitint=undef, use64bitall=undef, uselongdouble=undef usemymalloc=y, bincompat5005=undef Compiler: cc='cc', ccflags ='-DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64', optimize='-O2 -g', cppflags='-DDEBUGGING -fno-strict-aliasing -pipe -fstack-protector' ccversion='', gccversion='4.5.2', gccosandvers='' intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234 d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12 ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8 alignbytes=4, prototype=define Linker and Libraries: ld='cc', ldflags =' -fstack-protector' libpth=/lib /usr/lib libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc libc=/lib/libc-2.11.so, so=so, useshrplib=false, libperl=libperl.a gnulibc_version='2.11' Dynamic Linking: dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E' cccdlflags='-fPIC', lddlflags='-shared -O2 -g -fstack-protector' Characteristics of this binary (from libperl): Compile-time options: DEBUGGING MYMALLOC PERL_DONT_CREATE_GVSV PERL_MALLOC_WRAP PERL_PRESERVE_IVUV PERL_USE_DEVEL USE_LARGE_FILES USE_PERLIO USE_PERL_ATOF Built under linux Compiled at Apr 1 2011 21:33:38 %ENV: PERL5LIB="/Personal/perlutl:/Work/PerlScripts/utl:/Work/PerlScripts/sgml:/Work/PerlScripts/translations:/Work/PerlScripts/pleps" PERL6LIB="/Personal/p6utl:/Work/PerlScripts/p6" PERLSCRIPTS="/Work/PerlScripts" @INC: /Personal/perlutl /Work/PerlScripts/utl /Work/PerlScripts/sgml /Work/PerlScripts/translations /Work/PerlScripts/pleps /opt/perl-5.13.11-357-d/lib/site_perl/5.13.11/i686-linux /opt/perl-5.13.11-357-d/lib/site_perl/5.13.11 /opt/perl-5.13.11-357-d/lib/5.13.11/i686-linux /opt/perl-5.13.11-357-d/lib/5.13.11 .