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-ruby-1.8.7-p160
 $ ./configure --help
 `configure' configures this package to adapt to many kinds of systems.
 
 Usage: ../configure [OPTION]... [VAR=VALUE]...
 
 To assign environment variables (e.g., CC, CFLAGS...), specify them as
 VAR=VALUE.  See below for descriptions of some of the useful variables.
 
 Defaults for the options are specified in brackets.
 
 Configuration:
   -h, --help              display this help and exit
       --help=short        display options specific to this package
       --help=recursive    display the short help of all the included packages
   -V, --version           display version information and exit
   -q, --quiet, --silent   do not print `checking...' messages
       --cache-file=FILE   cache test results in FILE [disabled]
   -C, --config-cache      alias for `--cache-file=config.cache'
   -n, --no-create         do not create output files
       --srcdir=DIR        find the sources in DIR [configure dir or `..']
 
 Installation directories:
   --prefix=PREFIX         install architecture-independent files in PREFIX
                           [/usr/local]
   --exec-prefix=EPREFIX   install architecture-dependent files in EPREFIX
                           [PREFIX]
 
 By default, `make install' will install all the files in
 `/usr/local/bin', `/usr/local/lib' etc.  You can specify
 an installation prefix other than `/usr/local' using `--prefix',
 for instance `--prefix=$HOME'.
 
 For better control, use the options below.
 
 Fine tuning of the installation directories:
   --bindir=DIR           user executables [EPREFIX/bin]
   --sbindir=DIR          system admin executables [EPREFIX/sbin]
   --libexecdir=DIR       program executables [EPREFIX/libexec]
   --sysconfdir=DIR       read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR   modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR    modifiable single-machine data [PREFIX/var]
   --libdir=DIR           object code libraries [EPREFIX/lib]
   --includedir=DIR       C header files [PREFIX/include]
   --oldincludedir=DIR    C header files for non-gcc [/usr/include]
   --datarootdir=DIR      read-only arch.-independent data root [PREFIX/share]
   --datadir=DIR          read-only architecture-independent data [DATAROOTDIR]
   --infodir=DIR          info documentation [DATAROOTDIR/info]
   --localedir=DIR        locale-dependent data [DATAROOTDIR/locale]
   --mandir=DIR           man documentation [DATAROOTDIR/man]
   --docdir=DIR           documentation root [DATAROOTDIR/doc/PACKAGE]
   --htmldir=DIR          html documentation [DOCDIR]
   --dvidir=DIR           dvi documentation [DOCDIR]
   --pdfdir=DIR           pdf documentation [DOCDIR]
   --psdir=DIR            ps documentation [DOCDIR]
 
 Program names:
   --program-prefix=PREFIX            prepend PREFIX to installed program names
   --program-suffix=SUFFIX            append SUFFIX to installed program names
   --program-transform-name=PROGRAM   run sed PROGRAM on installed program names
 
 System types:
   --build=BUILD     configure for building on BUILD [guessed]
   --host=HOST       cross-compile to build programs to run on HOST [BUILD]
   --target=TARGET   configure for building compilers for TARGET [HOST]
 
 Optional Features:
   --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
   --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
   --enable-frame-address  use GCC __builtin_frame_address().
   --disable-largefile     omit support for large files
   --enable-pthread        use pthread library.
   --disable-fastthread    do not use the fastthread mutex
   --enable-setreuid       use setreuid()/setregid() according to need even if ob
 solete.
   --disable-rpath         embed run path into extension libraries.
   --enable-shared         build a shared library for Ruby.
   --enable-install-doc    build and install rdoc indexes during install
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
   --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
   --without-gcc           never use gcc
   --with-winsock2         link winsock2 (MinGW only)
   --with-libc_r           link libc_r if possible (FreeBSD only)
   --with-setjmp-type      select setjmp type
   --with-default-kcode=CODE specify default value for \$KCODE (utf8|euc|sjis|non
 e)
   --with-dln-a-out        use dln_a_out if possible
   --with-static-linked-ext link external modules statically
   --with-sitedir=DIR      site libraries in DIR [LIBDIR/ruby/site_ruby]
   --with-vendordir=DIR    vendor libraries in DIR [LIBDIR/ruby/vendor_ruby]
   --with-search-path=DIR specify the additional search path
   --with-mantype=TYPE specify man page type; TYPE is one of man and doc
 
 Some influential environment variables:
   CC          C compiler command
   CFLAGS      C compiler flags
   LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a
               nonstandard directory <lib dir>
   LIBS        libraries to pass to the linker, e.g. -l<library>
   CPPFLAGS    C/C++/Objective C preprocessor flags, e.g. -I<include dir> if
               you have headers in a nonstandard directory <include dir>
   CPP         C preprocessor
   YACC        The `Yet Another C Compiler' implementation to use. Defaults to
               the first program found out of: `bison -y', `byacc', `yacc'.
   YFLAGS      The list of arguments that will be passed by default to $YACC.
               This script will default YFLAGS to the empty string to avoid a
               default value of `-d' given by some make applications.
 
 Use these variables to override the choices made by `configure' or to help
 it to find libraries and programs with nonstandard names/locations.