$ perl -V Summary of my perl5 (revision 5 version 14 subversion 2) configuration: Platform: osname=cygwin, osvers=1.7.15(0.26053), archname=cygwin-thread-multi-64int uname='cygwin_nt-5.1 winxp 1.7.15(0.26053) 2012-05-09 10:25 i686 cygwin ' config_args='-de -Dlibperl=cygperl5_14.dll -Dcc=gcc-4 -Dld=g++-4 -Darchname=i686-cygwin-threads-64int -Dmksymlinks -Dusethreads -Accflags=-g' hint=recommended, useposix=true, d_sigaction=define useithreads=define, usemultiplicity=define useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef use64bitint=define, use64bitall=undef, uselongdouble=undef usemymalloc=n, bincompat5005=undef Compiler: cc='gcc-4', ccflags ='-DPERL_USE_SAFE_PUTENV -U__STRICT_ANSI__ -g -fno-strict-aliasing -pipe -fstack-protector', optimize='-O3', cppflags='-DPERL_USE_SAFE_PUTENV -U__STRICT_ANSI__ -g -fno-strict-aliasing -pipe -fstack-protector' ccversion='', gccversion='4.5.3', gccosandvers='' intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=12345678 d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12 ivtype='long long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8 alignbytes=8, prototype=define Linker and Libraries: ld='g++-4', ldflags =' -Wl,--enable-auto-import -Wl,--export-all-symbols -Wl,--enable-auto-image-base -fstack-protector -L/usr/local/lib' libpth=/usr/local/lib /usr/lib /lib libs=-lgdbm -ldb -ldl -lcrypt -lgdbm_compat perllibs=-ldl -lcrypt libc=/usr/lib/libc.a, so=dll, useshrplib=true, libperl=cygperl5_14.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 -L/usr/local/lib -fstack-protector' Characteristics of this binary (from libperl): Compile-time options: MULTIPLICITY PERL_DONT_CREATE_GVSV PERL_IMPLICIT_CONTEXT PERL_PRESERVE_IVUV PERL_USE_SAFE_PUTENV USE_64_BIT_INT USE_ITHREADS USE_LARGE_FILES USE_PERLIO USE_PERL_ATOF USE_REENTRANT_API Locally applied patches: Bug#55162 File::Spec::case_tolerant performance CYG07 $vendorarch/auto/.rebase CYG15 static Win32CORE CYG17 cyg-1.7 paths-utf8 0c612ce82 Fix building static extensions on cygwin, -UUSEIMPORTLIB 1bac5ecc1 Fix 64-bit threading sv.c: S_anonymise_cv_maybe Cygwin::sync_winenv added Built under cygwin Compiled at Jul 12 2012 14:17:21 %ENV: PERL5LIB="cygdrive/c/Dropbox/DOCS/WORK/PATH/my_PERL_SHARED_MODULES; cygdrive/c/Dropbox/DOCS/WORK/PATH/Scripts_Perl; C:/Cygwin/lib/perl5/site_perl/5.14/i686-cygwin-threads-64int/" PERL_JSON_BACKEND="JSON::XS" PERL_YAML_BACKEND="YAML" @INC: cygdrive/c/Dropbox/DOCS/WORK/PATH/my_PERL_SHARED_MODULES; cygdrive/c/Dropbox/DOCS/WORK/PATH/Scripts_Perl; C /Cygwin/lib/perl5/site_perl/5.14/i686-cygwin-threads-64int/ /usr/lib/perl5/site_perl/5.14/i686-cygwin-threads-64int /usr/lib/perl5/site_perl/5.14 /usr/lib/perl5/vendor_perl/5.14/i686-cygwin-threads-64int /usr/lib/perl5/vendor_perl/5.14 /usr/lib/perl5/5.14/i686-cygwin-threads-64int /usr/lib/perl5/5.14 /usr/lib/perl5/site_perl/5.10 /usr/lib/perl5/vendor_perl/5.10 /usr/lib/perl5/site_perl/5.8 .