Summary of my perl5 (revision 5 version 12 subversion 3) configuration:
   
  Platform:
    osname=darwin, osvers=11.0, archname=darwin-thread-multi-2level
    uname='darwin doublemagnum.apple.com 11.0 darwin kernel version 11.0.0: wed dec 22 11:00:23 pst 2010; root:xnu-1699.18.1~1release_x86_64 x86_64 '
    config_args='-ds -e -Dprefix=/usr -Dccflags=-g  -pipe  -Dldflags= -Dman3ext=3pm -Duseithreads -Duseshrplib -Dinc_version_list=none -Dcc=llvm-gcc-4.2'
    hint=recommended, useposix=true, d_sigaction=define
    useithreads=define, usemultiplicity=define
    useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
    use64bitint=define, use64bitall=define, uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='llvm-gcc-4.2', ccflags ='-arch x86_64 -arch i386 -g -pipe -fno-common -DPERL_DARWIN -fno-strict-aliasing -fstack-protector -I/usr/local/include',
    optimize='-Os',
    cppflags='-g -pipe -fno-common -DPERL_DARWIN -fno-strict-aliasing -fstack-protector -I/usr/local/include'
    ccversion='', gccversion='4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)', 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='llvm-gcc-4.2 -mmacosx-version-min=10.7', ldflags ='-arch x86_64 -arch i386 -fstack-protector -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib
    libs=-ldbm -ldl -lm -lutil -lc
    perllibs=-ldl -lm -lutil -lc
    libc=, so=dylib, useshrplib=true, libperl=libperl.dylib
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=bundle, d_dlsymun=undef, ccdlflags=' '
    cccdlflags=' ', lddlflags='-arch x86_64 -arch i386 -bundle -undefined dynamic_lookup -L/usr/local/lib -fstack-protector'


Characteristics of this binary (from libperl): 
  Compile-time options: MULTIPLICITY PERL_DONT_CREATE_GVSV
                        PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP USE_64_BIT_ALL
                        USE_64_BIT_INT USE_ITHREADS USE_LARGE_FILES
                        USE_PERLIO USE_PERL_ATOF USE_REENTRANT_API
  Locally applied patches:
	/Library/Perl/Updates/<version> comes before system perl directories
	installprivlib and installarchlib points to the Updates directory
  Built under darwin
  Compiled at May 25 2011 17:53:29
  %ENV:
    PERL5LIB="/Users/koorchik/.perl5/lib/perl5/darwin-thread-multi-2level:/Users/koorchik/.perl5/lib/perl5"
    PERL_LOCAL_LIB_ROOT="/Users/koorchik/.perl5"
    PERL_MB_OPT="--install_base /Users/koorchik/.perl5"
    PERL_MM_OPT="INSTALL_BASE=/Users/koorchik/.perl5"
  @INC:
    /Users/koorchik/.perl5/lib/perl5/darwin-thread-multi-2level
    /Users/koorchik/.perl5/lib/perl5/darwin-thread-multi-2level
    /Users/koorchik/.perl5/lib/perl5
    /Library/Perl/5.12/darwin-thread-multi-2level
    /Library/Perl/5.12
    /Network/Library/Perl/5.12/darwin-thread-multi-2level
    /Network/Library/Perl/5.12
    /Library/Perl/Updates/5.12.3/darwin-thread-multi-2level
    /Library/Perl/Updates/5.12.3
    /System/Library/Perl/5.12/darwin-thread-multi-2level
    /System/Library/Perl/5.12
    /System/Library/Perl/Extras/5.12/darwin-thread-multi-2level
    /System/Library/Perl/Extras/5.12
    .