*shell*

~ 
-> irb
irb(main):001:0> require 'rbconfig'
require 'rbconfig'
=> true
irb(main):002:0> require 'pp'
require 'pp'
=> true
irb(main):003:0> pp Config::CONFIG.to_a.sort
pp Config::CONFIG.to_a.sort
[["ALLOCA", ""],
 ["AR", "ar"],
 ["ARCHFILE", ""],
 ["ARCH_FLAG", ""],
 ["AS", "as"],
 ["ASFLAGS", ""],
 ["CC", "gcc-4.2"],
 ["CCDLFLAGS", " -fno-common"],
 ["CFLAGS",
  " -march=core2 -mmmx -msse4.1 -w -pipe -fomit-frame-pointer -mmacosx-version-min=10.6 -O3  -fno-common -pipe -fno-common  "],
 ["COMMON_HEADERS", ""],
 ["COMMON_LIBS", ""],
 ["COMMON_MACROS", ""],
 ["CP", "cp"],
 ["CPP", "gcc-4.2 -E"],
 ["CPPFLAGS", " -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE  "],
 ["CPPOUTFILE", "-o conftest.i"],
 ["DEFS", ""],
 ["DESTDIR", ""],
 ["DLDFLAGS", ""],
 ["DLDLIBS", ""],
 ["DLEXT", "bundle"],
 ["DLEXT2", ""],
 ["DLLWRAP", ""],
 ["ECHO_C", "\\\\c"],
 ["ECHO_N", ""],
 ["ECHO_T", ""],
 ["EGREP", "/usr/bin/grep -E"],
 ["ENABLE_SHARED", "yes"],
 ["EXEEXT", ""],
 ["EXPORT_PREFIX", ""],
 ["EXTOUT", ".ext"],
 ["EXTSTATIC", ""],
 ["GNU_LD", "no"],
 ["GREP", "/usr/bin/grep"],
 ["INSTALL", "/usr/bin/install -c"],
 ["INSTALL_DATA", "/usr/bin/install -c -m 644"],
 ["INSTALL_PROGRAM", "/usr/bin/install -c"],
 ["INSTALL_SCRIPT", "/usr/bin/install -c"],
 ["LDFLAGS", "-L. "],
 ["LDSHARED", "cc -dynamic -bundle -undefined suppress -flat_namespace"],
 ["LIBEXT", "a"],
 ["LIBPATHENV", "DYLD_LIBRARY_PATH"],
 ["LIBPATHFLAG", " -L%s"],
 ["LIBRUBY", "libruby.1.8.7.dylib"],
 ["LIBRUBYARG", "-lruby"],
 ["LIBRUBYARG_SHARED", "-lruby"],
 ["LIBRUBYARG_STATIC", "-lruby-static"],
 ["LIBRUBY_A", "libruby-static.a"],
 ["LIBRUBY_ALIASES", "libruby.1.8.dylib libruby.dylib"],
 ["LIBRUBY_DLDFLAGS",
  "-install_name /usr/local/Cellar/ruby/1.8.7-p174/lib/libruby.dylib -current_version 1.8.7 -compatibility_version 1.8"],
 ["LIBRUBY_LDSHARED", "cc -dynamiclib -undefined suppress -flat_namespace"],
 ["LIBRUBY_SO", "libruby.1.8.7.dylib"],
 ["LIBS", "-lpthread -ldl -lobjc "],
 ["LINK_SO", ""],
 ["LN_S", "ln -s"],
 ["MAINLIBS", ""],
 ["MAJOR", "1"],
 ["MAKEDIRS", "mkdir -p"],
 ["MAKEFILES", "Makefile"],
 ["MANTYPE", "doc"],
 ["MINOR", "8"],
 ["NM", ""],
 ["NROFF", "/usr/bin/nroff"],
 ["OBJDUMP", ""],
 ["OBJEXT", "o"],
 ["OUTFLAG", "-o "],
 ["PACKAGE_BUGREPORT", ""],
 ["PACKAGE_NAME", ""],
 ["PACKAGE_STRING", ""],
 ["PACKAGE_TARNAME", ""],
 ["PACKAGE_VERSION", ""],
 ["PATH_SEPARATOR", ":"],
 ["PREP", "miniruby"],
 ["RANLIB", "ranlib"],
 ["RDOCTARGET", ""],
 ["RM", "rm -f"],
 ["RPATHFLAG", ""],
 ["RUBYW_INSTALL_NAME", ""],
 ["RUBY_INSTALL_NAME", "ruby"],
 ["RUBY_SO_NAME", "ruby"],
 ["SET_MAKE", ""],
 ["SHELL", "/bin/sh"],
 ["SOLIBS", ""],
 ["STATIC", ""],
 ["STRIP", "strip -A -n"],
 ["TEENY", "7"],
 ["TRY_LINK", ""],
 ["WINDRES", ""],
 ["YACC", "bison -y"],
 ["YFLAGS", ""],
 ["arch", "i686-darwin10.0.0"],
 ["archdir",
  "/usr/local/Cellar/ruby/1.8.7-p174/lib/ruby/1.8/i686-darwin10.0.0"],
 ["bindir", "/usr/local/Cellar/ruby/1.8.7-p174/bin"],
 ["build", "i686-apple-darwin10.0.0"],
 ["build_alias", ""],
 ["build_cpu", "i686"],
 ["build_os", "darwin10.0.0"],
 ["build_vendor", "apple"],
 ["cflags", " "],
 ["configure_args",
  " '--prefix=/usr/local/Cellar/ruby/1.8.7-p174' '--enable-shared' '--enable-pthread' 'CC=gcc-4.2' 'CFLAGS= -march=core2 -mmmx -msse4.1 -w -pipe -fomit-frame-pointer -mmacosx-version-min=10.6 -O3' 'LDFLAGS=' 'CPPFLAGS='"],
 ["cppflags", ""],
 ["datadir", "/usr/local/Cellar/ruby/1.8.7-p174/share"],
 ["datarootdir", "/usr/local/Cellar/ruby/1.8.7-p174/share"],
 ["debugflags", ""],
 ["docdir", "/usr/local/Cellar/ruby/1.8.7-p174/share/doc/$(PACKAGE)"],
 ["dvidir", "/usr/local/Cellar/ruby/1.8.7-p174/share/doc/$(PACKAGE)"],
 ["exec_prefix", "/usr/local/Cellar/ruby/1.8.7-p174"],
 ["host", "i686-apple-darwin10.0.0"],
 ["host_alias", ""],
 ["host_cpu", "i686"],
 ["host_os", "darwin10.0.0"],
 ["host_vendor", "apple"],
 ["htmldir", "/usr/local/Cellar/ruby/1.8.7-p174/share/doc/$(PACKAGE)"],
 ["includedir", "/usr/local/Cellar/ruby/1.8.7-p174/include"],
 ["infodir", "/usr/local/Cellar/ruby/1.8.7-p174/share/info"],
 ["libdir", "/usr/local/Cellar/ruby/1.8.7-p174/lib"],
 ["libexecdir", "/usr/local/Cellar/ruby/1.8.7-p174/libexec"],
 ["localedir", "/usr/local/Cellar/ruby/1.8.7-p174/share/locale"],
 ["localstatedir", "/usr/local/Cellar/ruby/1.8.7-p174/var"],
 ["mandir", "/usr/local/Cellar/ruby/1.8.7-p174/share/man"],
 ["oldincludedir", "/usr/include"],
 ["optflags", ""],
 ["pdfdir", "/usr/local/Cellar/ruby/1.8.7-p174/share/doc/$(PACKAGE)"],
 ["prefix", "/usr/local/Cellar/ruby/1.8.7-p174"],
 ["psdir", "/usr/local/Cellar/ruby/1.8.7-p174/share/doc/$(PACKAGE)"],
 ["ruby_install_name", "ruby"],
 ["ruby_version", "1.8"],
 ["rubylibdir", "/usr/local/Cellar/ruby/1.8.7-p174/lib/ruby/1.8"],
 ["rubyw_install_name", ""],
 ["sbindir", "/usr/local/Cellar/ruby/1.8.7-p174/sbin"],
 ["setup", "Setup"],
 ["sharedstatedir", "/usr/local/Cellar/ruby/1.8.7-p174/com"],
 ["sitearch", "i686-darwin10.0.0"],
 ["sitearchdir",
  "/usr/local/Cellar/ruby/1.8.7-p174/lib/ruby/site_ruby/1.8/i686-darwin10.0.0"],
 ["sitedir", "/usr/local/Cellar/ruby/1.8.7-p174/lib/ruby/site_ruby"],
 ["sitelibdir", "/usr/local/Cellar/ruby/1.8.7-p174/lib/ruby/site_ruby/1.8"],
 ["sysconfdir", "/usr/local/Cellar/ruby/1.8.7-p174/etc"],
 ["target", "i686-apple-darwin10.0.0"],
 ["target_alias", ""],
 ["target_cpu", "i686"],
 ["target_os", "darwin10.0.0"],
 ["target_vendor", "apple"],
 ["topdir",
  "/usr/local/Cellar/ruby/1.8.7-p174/lib/ruby/1.8/i686-darwin10.0.0"],
 ["vendorarchdir",
  "/usr/local/Cellar/ruby/1.8.7-p174/lib/ruby/vendor_ruby/1.8/i686-darwin10.0.0"],
 ["vendordir", "/usr/local/Cellar/ruby/1.8.7-p174/lib/ruby/vendor_ruby"],
 ["vendorlibdir",
  "/usr/local/Cellar/ruby/1.8.7-p174/lib/ruby/vendor_ruby/1.8"]]
=> nil
irb(main):004:0>