Summary of my perl5 (revision 5 version 14 subversion 4) configuration: Platform: osname=linux, osvers=4.9.0-2-amd64, archname=x86_64-linux@g uname='linux reini 4.9.0-2-amd64 #1 smp debian 4.9.13-1 (2017-02-27) x86_64 gnulinux ' config_args='-de -Dusedevel -Uversiononly -Dinstallman1dir=none -Dinstallman3dir=none -Dinstallsiteman1dir=none -Dinstallsiteman3dir=none -Uuseithreads -D'optimize=-O1\ -g' -Accflags=''''-msse4.2'''' -Accflags=''''-march=corei7''''' hint=recommended, useposix=true, d_sigaction=define useithreads=undef, usemultiplicity=undef useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef use64bitint=define, use64bitall=define, uselongdouble=undef usemymalloc=n, bincompat5005=undef Compiler: cc='gcc-6', ccflags ='-msse4.2 -march=corei7 -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64', optimize='-O1 -g', cppflags='-msse4.2 -march=corei7 -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include' ccversion='', gccversion='6.3.0 20170321', gccosandvers='' intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678 d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16 ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8 alignbytes=8, prototype=define Linker and Libraries: ld='cc', ldflags =' -fstack-protector -L/usr/local/lib -L/opt/local/lib' libpth=/usr/local/lib /opt/local/lib /lib/x86_64-linux-gnu /lib/../lib /usr/lib/x86_64-linux-gnu /usr/lib/../lib /lib /usr/lib /lib64 /usr/lib64 /usr/local/lib64 libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc libc=libc-2.24.so, so=so, useshrplib=false, libperl=libperl.a gnulibc_version='2.24' Dynamic Linking: dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E' cccdlflags='-fPIC', lddlflags='-shared -O1 -g -L/usr/local/lib -L/opt/local/lib -fstack-protector' Characteristics of this binary (from libperl): Compile-time options: PERL_DONT_CREATE_GVSV PERL_MALLOC_WRAP PERL_PRESERVE_IVUV PERL_USE_DEVEL USE_64_BIT_ALL USE_64_BIT_INT USE_LARGE_FILES USE_PERLIO USE_PERL_ATOF Built under linux Compiled at Apr 10 2017 13:34:58 @INC: /usr/local/lib/perl5/site_perl/5.14.4/x86_64-linux@g /usr/local/lib/perl5/site_perl/5.14.4 /usr/local/lib/perl5/5.14.4/x86_64-linux@g /usr/local/lib/perl5/5.14.4 /usr/local/lib/perl5/site_perl/5.14.3 /usr/local/lib/perl5/site_perl/5.12.5 /usr/local/lib/perl5/site_perl/5.10.1 /usr/local/lib/perl5/site_perl/5.10.0 /usr/local/lib/perl5/site_perl/5.8.9 /usr/local/lib/perl5/site_perl .