$ perl -V Summary of my perl5 (revision 5 version 22 subversion 3) configuration: Platform: osname=cygwin, osvers=2.6.1(0.30553), archname=cygwin-thread-multi uname='cygwin_nt-6.3 cygwin 2.6.1(0.30553) 2016-12-16 11:55 x86_64 cygwin ' config_args='-des -Dprefix=/usr -Dmksymlinks -Darchname=x86_64-cygwin-threads -Dlibperl=cygperl5_22.dll -Dcc=gcc -Dld=g++ -Accflags=-ggdb -O2 -pipe -Wimplicit-function-declaration -fdebug-prefix-map=/mnt/share/maint/perl.x86_64/build=/usr/src/debug/perl-5.22.3-1 -fdebug-prefix-map=/mnt/share/maint/perl.x86_64/src/perl-5.22.3=/usr/src/debug/perl-5.22.3-1 -fwrapv' hint=recommended, useposix=true, d_sigaction=define useithreads=define, usemultiplicity=define use64bitint=define, use64bitall=define, uselongdouble=undef usemymalloc=n, bincompat5005=undef Compiler: cc='gcc', ccflags ='-DPERL_USE_SAFE_PUTENV -D_GNU_SOURCE -U__STRICT_ANSI__ -ggdb -O2 -pipe -Wimplicit-function-declaration -fdebug-prefix-map=/mnt/share/maint/perl.x86_64/build=/usr/src/debug/perl-5.22.3-1 -fdebug-prefix-map=/mnt/share/maint/perl.x86_64/src/perl-5.22.3=/usr/src/debug/perl-5.22.3-1 -fwrapv -fno-strict-aliasing -fstack-protector-strong -D_FORTIFY_SOURCE=2', optimize='-O3', cppflags='-DPERL_USE_SAFE_PUTENV -D_GNU_SOURCE -U__STRICT_ANSI__ -ggdb -O2 -pipe -Wimplicit-function-declaration -fdebug-prefix-map=/mnt/share/maint/perl.x86_64/build=/usr/src/debug/perl-5.22.3-1 -fdebug-prefix-map=/mnt/share/maint/perl.x86_64/src/perl-5.22.3=/usr/src/debug/perl-5.22.3-1 -fwrapv -fno-strict-aliasing -fstack-protector-strong' ccversion='', gccversion='5.4.0', gccosandvers='' intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678, doublekind=3 d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16, longdblkind=3 ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8 alignbytes=8, prototype=define Linker and Libraries: ld='g++', ldflags =' -Wl,--enable-auto-import -Wl,--export-all-symbols -Wl,--enable-auto-image-base -fstack-protector-strong' libpth=/usr/lib libs=-lpthread -lgdbm -ldb -ldl -lcrypt -lgdbm_compat perllibs=-lpthread -ldl -lcrypt libc=/usr/lib/libcygwin.a, so=dll, useshrplib=true, libperl=cygperl5_22.dll gnulibc_version='' Dynamic Linking: dlsrc=dl_dlopen.xs, dlext=dll, d_dlsymun=undef, ccdlflags=' ' cccdlflags=' ', lddlflags=' --shared -Wl,--enable-auto-import -Wl,--export-all-symbols -Wl,--enable-auto-image-base -fstack-protector-strong' Characteristics of this binary (from libperl): Compile-time options: HAS_TIMES MULTIPLICITY PERLIO_LAYERS PERL_DONT_CREATE_GVSV PERL_HASH_FUNC_ONE_AT_A_TIME_HARD PERL_IMPLICIT_CONTEXT PERL_NEW_COPY_ON_WRITE PERL_PRESERVE_IVUV PERL_USE_SAFE_PUTENV USE_64_BIT_ALL USE_64_BIT_INT USE_ITHREADS USE_LARGE_FILES USE_LOCALE USE_LOCALE_COLLATE USE_LOCALE_CTYPE USE_LOCALE_NUMERIC USE_LOCALE_TIME USE_PERLIO USE_PERL_ATOF USE_REENTRANT_API Built under cygwin Compiled at Jan 15 2017 13:11:06 %ENV: PERL5LIB="/home/mdk2126/perl5/lib/perl5" PERL_LOCAL_LIB_ROOT="/home/mdk2126/perl5" PERL_MB_OPT="--install_base "/home/mdk2126/perl5"" PERL_MM_OPT="INSTALL_BASE=/home/mdk2126/perl5" @INC: /home/mdk2126/perl5/lib/perl5/cygwin-thread-multi /home/mdk2126/perl5/lib/perl5 /usr/lib/perl5/site_perl/5.22/x86_64-cygwin-threads /usr/lib/perl5/site_perl/5.22 /usr/lib/perl5/vendor_perl/5.22/x86_64-cygwin-threads /usr/lib/perl5/vendor_perl/5.22 /usr/lib/perl5/5.22/x86_64-cygwin-threads /usr/lib/perl5/5.22 .