曾与蒿藜同雨露,한때 잡초와 쑥과 함께 비와 이슬을 나누던 곳이 이제는 소나무와 삼나무와 함께 서리와 눈을 견뎌내고 있다.终随松柏到冰霜.かつては雑草やヨモギと共に雨や露を分かち合っていたが、今では松やヒノキと共に霜や雪に耐えている。曾与蒿藜同雨露,Once sharing rain and dew with weeds and wormwood, now enduring frost and snow with pines and cypresses.终随松柏到冰霜.曾与蒿藜同雨露한때 잡초와 쑥과 함께 비와 이슬을 나누던 곳이 이제는 소나무와 삼나무와 함께 서리와 눈을 견뎌내고 있다.,终随松柏到冰霜.譖セ荳手珍阯懷酔髮ィ髴イ�檎サ磯囂譚セ譟丞芦蜀ー髴�曾与蒿藜同雨露,鏇句笌钂胯棞鍚岄洦闇诧紝缁堥殢鏉炬煆鍒板啺闇�终随松柏到冰霜.曾与蒿藜同雨露,한때 잡초와 쑥과 함께 비와 이슬을 나누던 곳이 이제는 소나무와 삼나무와 함께 서리와 눈을 견뎌내고 있다.终随松柏到冰霜.曾与蒿藜同雨露,终随松柏到冰霜. rahbord-ins.ir - GrazzMean-Shell
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: /opt/alt/ruby31/lib64/ruby/ [ drwxr-xr-x ]
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name : rbconfig.rb
# encoding: ascii-8bit
# frozen-string-literal: false
#
# The module storing Ruby interpreter configurations on building.
#
# This file was created by mkconfig.rb when ruby was built.  It contains
# build information for ruby which is used e.g. by mkmf to build
# compatible native extensions.  Any changes made to this file will be
# lost the next time ruby is built.

module RbConfig
  RUBY_VERSION.start_with?("3.1.") or
    raise "ruby lib version (3.1.7) doesn't match executable version (#{RUBY_VERSION})"

  # Ruby installed directory.
  TOPDIR = File.dirname(__FILE__).chomp!("/lib64/ruby")
  # DESTDIR on make install.
  DESTDIR = '' unless defined? DESTDIR
  # The hash configurations stored.
  CONFIG = {}
  CONFIG["DESTDIR"] = DESTDIR
  CONFIG["MAJOR"] = "3"
  CONFIG["MINOR"] = "1"
  CONFIG["TEENY"] = "7"
  CONFIG["PATCHLEVEL"] = "261"
  CONFIG["INSTALL"] = '/usr/bin/install -c'
  CONFIG["EXEEXT"] = ""
  CONFIG["prefix"] = (((TOPDIR && TOPDIR.empty?) ? nil : TOPDIR) || DESTDIR + "/opt/alt/ruby31")
  CONFIG["ruby_install_name"] = "$(RUBY_BASE_NAME)"
  CONFIG["RUBY_INSTALL_NAME"] = "$(RUBY_BASE_NAME)"
  CONFIG["RUBY_SO_NAME"] = "$(RUBY_BASE_NAME)"
  CONFIG["exec"] = "exec"
  CONFIG["ruby_pc"] = "ruby.pc"
  CONFIG["CC_WRAPPER"] = ""
  CONFIG["PACKAGE"] = "ruby"
  CONFIG["BUILTIN_TRANSSRCS"] = " enc/trans/newline.c"
  CONFIG["MKMF_VERBOSE"] = "0"
  CONFIG["MANTYPE"] = "doc"
  CONFIG["vendorarchhdrdir"] = "$(vendorhdrdir)/$(arch)"
  CONFIG["sitearchhdrdir"] = "$(sitehdrdir)/$(arch)"
  CONFIG["rubyarchhdrdir"] = "$(DESTDIR)/opt/alt/ruby31/include"
  CONFIG["vendorhdrdir"] = "$(rubyhdrdir)/vendor_ruby"
  CONFIG["sitehdrdir"] = "$(rubyhdrdir)/site_ruby"
  CONFIG["rubyhdrdir"] = "$(DESTDIR)/opt/alt/ruby31/include"
  CONFIG["RUBY_SEARCH_PATH"] = ""
  CONFIG["UNIVERSAL_INTS"] = ""
  CONFIG["UNIVERSAL_ARCHNAMES"] = ""
  CONFIG["configure_args"] = " '--build=x86_64-redhat-linux-gnu' '--host=x86_64-redhat-linux-gnu' '--program-prefix=' '--disable-dependency-tracking' '--prefix=/opt/alt/ruby31' '--exec-prefix=/opt/alt/ruby31' '--bindir=/opt/alt/ruby31/bin' '--sbindir=/opt/alt/ruby31/sbin' '--sysconfdir=/etc' '--datadir=/opt/alt/ruby31/share' '--includedir=/opt/alt/ruby31/include' '--libdir=/opt/alt/ruby31/lib64' '--libexecdir=/opt/alt/ruby31/libexec' '--localstatedir=/var' '--sharedstatedir=/var/lib' '--mandir=/opt/alt/ruby31/share/man' '--infodir=/opt/alt/ruby31/share/info' '--with-rubylibprefix=/opt/alt/ruby31/share/ruby' '--with-archlibdir=/opt/alt/ruby31/lib64' '--with-rubyarchprefix=/opt/alt/ruby31/lib64/ruby' '--with-sitedir=/opt/alt/ruby31/share/ruby/site_ruby' '--with-sitearchdir=/opt/alt/ruby31/lib64/ruby/site_ruby' '--with-vendordir=/opt/alt/ruby31/share/ruby/vendor_ruby' '--with-vendorarchdir=/opt/alt/ruby31/lib64/ruby/vendor_ruby' '--with-rubyhdrdir=/opt/alt/ruby31/include' '--with-rubyarchhdrdir=/opt/alt/ruby31/include' '--with-sitearchhdrdir=$$(sitehdrdir)/$$(arch)' '--with-vendorarchhdrdir=$$(vendorhdrdir)/$$(arch)' '--with-rubygemsdir=/opt/alt/ruby31/share/rubygems' '--with-ruby-pc=ruby.pc' '--with-compress-debug-sections=no' '--enable-shared' '--with-ruby-version=' '--enable-multiarch' 'build_alias=x86_64-redhat-linux-gnu' 'host_alias=x86_64-redhat-linux-gnu' 'CFLAGS=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches   -m64 -mtune=generic' 'LDFLAGS=-Wl,-z,relro ' 'CXXFLAGS=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches   -m64 -mtune=generic'"
  CONFIG["CONFIGURE"] = "configure"
  CONFIG["rubygemsdir"] = "$(DESTDIR)/opt/alt/ruby31/share/rubygems"
  CONFIG["vendorarchdir"] = "$(DESTDIR)/opt/alt/ruby31/lib64/ruby/vendor_ruby"
  CONFIG["vendorlibdir"] = "$(vendordir)"
  CONFIG["vendordir"] = "$(DESTDIR)/opt/alt/ruby31/share/ruby/vendor_ruby"
  CONFIG["sitearchdir"] = "$(DESTDIR)/opt/alt/ruby31/lib64/ruby/site_ruby"
  CONFIG["sitelibdir"] = "$(sitedir)"
  CONFIG["sitedir"] = "$(DESTDIR)/opt/alt/ruby31/share/ruby/site_ruby"
  CONFIG["rubyarchdir"] = "$(rubyarchprefix)"
  CONFIG["rubylibdir"] = "$(rubylibprefix)"
  CONFIG["ruby_version_dir_name"] = ""
  CONFIG["ruby_version"] = "3.1.0"
  CONFIG["sitearch"] = "$(arch)"
  CONFIG["arch"] = "x86_64-linux"
  CONFIG["sitearchincludedir"] = "$(includedir)/$(sitearch)"
  CONFIG["archincludedir"] = "$(includedir)/$(arch)"
  CONFIG["sitearchlibdir"] = "$(libdir)/$(sitearch)"
  CONFIG["archlibdir"] = "$(DESTDIR)/opt/alt/ruby31/lib64"
  CONFIG["libdirname"] = "archlibdir"
  CONFIG["RUBY_EXEC_PREFIX"] = "/opt/alt/ruby31"
  CONFIG["RUBY_LIB_VERSION"] = "3.1.0"
  CONFIG["RUBY_LIB_VERSION_STYLE"] = "3\t/* full */"
  CONFIG["RI_BASE_NAME"] = "ri"
  CONFIG["ridir"] = "$(datarootdir)/$(RI_BASE_NAME)"
  CONFIG["rubysitearchprefix"] = "$(sitearchlibdir)/$(RUBY_BASE_NAME)"
  CONFIG["rubyarchprefix"] = "/opt/alt/ruby31/lib64/ruby"
  CONFIG["MAKEFILES"] = "Makefile GNUmakefile"
  CONFIG["PLATFORM_DIR"] = ""
  CONFIG["THREAD_MODEL"] = "pthread"
  CONFIG["SYMBOL_PREFIX"] = ""
  CONFIG["EXPORT_PREFIX"] = ""
  CONFIG["COMMON_HEADERS"] = ""
  CONFIG["COMMON_MACROS"] = ""
  CONFIG["COMMON_LIBS"] = ""
  CONFIG["MAINLIBS"] = "-lz -lpthread -lrt -lrt -lgmp -ldl -lcrypt -lm "
  CONFIG["ENABLE_SHARED"] = "yes"
  CONFIG["DLDSHARED"] = "$(CC) -shared"
  CONFIG["DLDLIBS"] = "-lc"
  CONFIG["SOLIBS"] = "$(MAINLIBS)"
  CONFIG["LIBRUBYARG_SHARED"] = "-Wl,-rpath,$(archlibdir) -L$(archlibdir) -l$(RUBY_SO_NAME)"
  CONFIG["LIBRUBYARG_STATIC"] = "-Wl,-rpath,$(archlibdir) -L$(archlibdir) -l$(RUBY_SO_NAME)-static $(MAINLIBS)"
  CONFIG["LIBRUBYARG"] = "$(LIBRUBYARG_SHARED)"
  CONFIG["LIBRUBY"] = "$(LIBRUBY_SO)"
  CONFIG["LIBRUBY_ALIASES"] = "$(LIBRUBY_SONAME) lib$(RUBY_SO_NAME).$(SOEXT)"
  CONFIG["LIBRUBY_SONAME"] = "lib$(RUBY_SO_NAME).$(SOEXT).$(RUBY_API_VERSION)"
  CONFIG["LIBRUBY_SO"] = "lib$(RUBY_SO_NAME).$(SOEXT).$(RUBY_PROGRAM_VERSION)"
  CONFIG["LIBRUBY_A"] = "lib$(RUBY_SO_NAME)-static.a"
  CONFIG["RUBYW_INSTALL_NAME"] = ""
  CONFIG["rubyw_install_name"] = ""
  CONFIG["EXTDLDFLAGS"] = ""
  CONFIG["EXTLDFLAGS"] = ""
  CONFIG["strict_warnflags"] = ""
  CONFIG["warnflags"] = "-Wall -Wextra -Wdeprecated-declarations -Wimplicit-function-declaration -Wimplicit-int -Wpointer-arith -Wwrite-strings -Wmissing-noreturn -Wno-cast-function-type -Wno-constant-logical-operand -Wno-long-long -Wno-missing-field-initializers -Wno-overlength-strings -Wno-packed-bitfield-compat -Wno-parentheses-equality -Wno-self-assign -Wno-tautological-compare -Wno-unused-parameter -Wno-unused-value -Wsuggest-attribute=format -Wsuggest-attribute=noreturn -Wunused-variable"
  CONFIG["debugflags"] = "-ggdb3"
  CONFIG["optflags"] = "-O3 -fno-fast-math"
  CONFIG["NULLCMD"] = ":"
  CONFIG["ENABLE_DEBUG_ENV"] = ""
  CONFIG["DLNOBJ"] = "dln.o"
  CONFIG["INSTALL_STATIC_LIBRARY"] = "no"
  CONFIG["MJIT_SUPPORT"] = "yes"
  CONFIG["EXECUTABLE_EXTS"] = ""
  CONFIG["ARCHFILE"] = ""
  CONFIG["LIBRUBY_RELATIVE"] = "no"
  CONFIG["EXTOUT"] = ".ext"
  CONFIG["PREP"] = "miniruby$(EXEEXT)"
  CONFIG["CROSS_COMPILING"] = "no"
  CONFIG["TEST_RUNNABLE"] = "yes"
  CONFIG["rubylibprefix"] = "$(exec_prefix)/share/ruby"
  CONFIG["setup"] = "Setup"
  CONFIG["ENCSTATIC"] = ""
  CONFIG["EXTSTATIC"] = ""
  CONFIG["SOEXT"] = "so"
  CONFIG["TRY_LINK"] = ""
  CONFIG["PRELOADENV"] = "LD_PRELOAD"
  CONFIG["LIBPATHENV"] = "LD_LIBRARY_PATH"
  CONFIG["RPATHFLAG"] = " -Wl,-rpath,%1$-s"
  CONFIG["LIBPATHFLAG"] = " -L%1$-s"
  CONFIG["LINK_SO"] = ""
  CONFIG["ADDITIONAL_DLDFLAGS"] = ""
  CONFIG["ASMEXT"] = "S"
  CONFIG["LIBEXT"] = "a"
  CONFIG["DLEXT"] = "so"
  CONFIG["LDSHAREDXX"] = "$(CXX) -shared"
  CONFIG["LDSHARED"] = "$(CC) -shared"
  CONFIG["CCDLFLAGS"] = "-fPIC"
  CONFIG["STATIC"] = ""
  CONFIG["ARCH_FLAG"] = "-m64"
  CONFIG["DLDFLAGS"] = "-Wl,-z,relro "
  CONFIG["ALLOCA"] = ""
  CONFIG["dsymutil"] = ""
  CONFIG["codesign"] = ""
  CONFIG["cleanlibs"] = ""
  CONFIG["POSTLINK"] = ":"
  CONFIG["incflags"] = ""
  CONFIG["WERRORFLAG"] = "-Werror"
  CONFIG["CHDIR"] = "cd -P"
  CONFIG["RMALL"] = "rm -fr"
  CONFIG["RMDIRS"] = "rmdir --ignore-fail-on-non-empty -p"
  CONFIG["RMDIR"] = "rmdir --ignore-fail-on-non-empty"
  CONFIG["CP"] = "cp"
  CONFIG["RM"] = "rm -f"
  CONFIG["PKG_CONFIG"] = "pkg-config"
  CONFIG["DOXYGEN"] = ""
  CONFIG["DOT"] = ""
  CONFIG["MAKEDIRS"] = "/usr/bin/mkdir -p"
  CONFIG["MKDIR_P"] = "/usr/bin/mkdir -p"
  CONFIG["INSTALL_DATA"] = "$(INSTALL) -m 644"
  CONFIG["INSTALL_SCRIPT"] = "$(INSTALL)"
  CONFIG["INSTALL_PROGRAM"] = "$(INSTALL)"
  CONFIG["SET_MAKE"] = ""
  CONFIG["LN_S"] = "ln -s"
  CONFIG["DLLWRAP"] = ""
  CONFIG["WINDRES"] = ""
  CONFIG["ASFLAGS"] = ""
  CONFIG["ARFLAGS"] = "rcD "
  CONFIG["try_header"] = ""
  CONFIG["CC_VERSION_MESSAGE"] = "gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-44)\nCopyright (C) 2015 Free Software Foundation, Inc.\nThis is free software; see the source for copying conditions.  There is NO\nwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
  CONFIG["CC_VERSION"] = "$(CC) --version"
  CONFIG["MJIT_CC"] = "/usr/bin/gcc -std=gnu99"
  CONFIG["CSRCFLAG"] = ""
  CONFIG["COUTFLAG"] = "-o "
  CONFIG["OUTFLAG"] = "-o "
  CONFIG["CPPOUTFILE"] = "-o conftest.i"
  CONFIG["GNU_LD"] = "yes"
  CONFIG["GCC"] = "yes"
  CONFIG["EGREP"] = "/usr/bin/grep -E"
  CONFIG["GREP"] = "/usr/bin/grep"
  CONFIG["CPP"] = "$(CC) -E"
  CONFIG["CXXFLAGS"] = "-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -mtune=generic"
  CONFIG["OBJEXT"] = "o"
  CONFIG["CPPFLAGS"] = " $(DEFS) $(cppflags)"
  CONFIG["LDFLAGS"] = "-L. -Wl,-z,relro -fstack-protector-strong -rdynamic -Wl,-export-dynamic -Wl,--no-as-needed"
  CONFIG["CFLAGS"] = "-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -mtune=generic -fPIC"
  CONFIG["STRIP"] = "strip -S -x"
  CONFIG["RANLIB"] = "gcc-ranlib"
  CONFIG["OBJDUMP"] = "objdump"
  CONFIG["OBJCOPY"] = ":"
  CONFIG["NM"] = "gcc-nm"
  CONFIG["LD"] = "ld"
  CONFIG["CXX"] = "g++"
  CONFIG["AS"] = "as"
  CONFIG["AR"] = "gcc-ar"
  CONFIG["CC"] = "gcc -std=gnu99"
  CONFIG["target_os"] = "linux"
  CONFIG["target_vendor"] = "redhat"
  CONFIG["target_cpu"] = "x86_64"
  CONFIG["target"] = "x86_64-redhat-linux-gnu"
  CONFIG["host_os"] = "linux"
  CONFIG["host_vendor"] = "redhat"
  CONFIG["host_cpu"] = "x86_64"
  CONFIG["host"] = "x86_64-redhat-linux-gnu"
  CONFIG["build_os"] = "linux-gnu"
  CONFIG["build_vendor"] = "redhat"
  CONFIG["build_cpu"] = "x86_64"
  CONFIG["build"] = "x86_64-redhat-linux-gnu"
  CONFIG["RUBY_VERSION_NAME"] = "$(RUBY_BASE_NAME)-$(ruby_version_dir_name)"
  CONFIG["RUBYW_BASE_NAME"] = "rubyw"
  CONFIG["RUBY_BASE_NAME"] = "ruby"
  CONFIG["RUBY_PROGRAM_VERSION"] = "$(MAJOR).$(MINOR).$(TEENY)"
  CONFIG["RUBY_API_VERSION"] = "$(MAJOR).$(MINOR)"
  CONFIG["HAVE_GIT"] = "yes"
  CONFIG["GIT"] = "git"
  CONFIG["cxxflags"] = ""
  CONFIG["cppflags"] = ""
  CONFIG["cflags"] = "$(optflags) $(debugflags) $(warnflags)"
  CONFIG["target_alias"] = ""
  CONFIG["host_alias"] = ""
  CONFIG["build_alias"] = "x86_64-redhat-linux-gnu"
  CONFIG["LIBS"] = "-lm "
  CONFIG["ECHO_T"] = ""
  CONFIG["ECHO_N"] = "-n"
  CONFIG["ECHO_C"] = ""
  CONFIG["DEFS"] = ""
  CONFIG["mandir"] = "$(DESTDIR)/opt/alt/ruby31/share/man"
  CONFIG["localedir"] = "$(datarootdir)/locale"
  CONFIG["libdir"] = "$(exec_prefix)/lib64"
  CONFIG["psdir"] = "$(docdir)"
  CONFIG["pdfdir"] = "$(docdir)"
  CONFIG["dvidir"] = "$(docdir)"
  CONFIG["htmldir"] = "$(docdir)"
  CONFIG["infodir"] = "$(DESTDIR)/opt/alt/ruby31/share/info"
  CONFIG["docdir"] = "$(datarootdir)/doc/$(PACKAGE)"
  CONFIG["oldincludedir"] = "/usr/include"
  CONFIG["includedir"] = "$(exec_prefix)/include"
  CONFIG["localstatedir"] = "$(DESTDIR)/var"
  CONFIG["sharedstatedir"] = "$(DESTDIR)/var/lib"
  CONFIG["sysconfdir"] = "$(DESTDIR)/etc"
  CONFIG["datadir"] = "$(DESTDIR)/opt/alt/ruby31/share"
  CONFIG["datarootdir"] = "$(prefix)/share"
  CONFIG["libexecdir"] = "$(DESTDIR)/opt/alt/ruby31/libexec"
  CONFIG["sbindir"] = "$(DESTDIR)/opt/alt/ruby31/sbin"
  CONFIG["bindir"] = "$(exec_prefix)/bin"
  CONFIG["exec_prefix"] = "$(DESTDIR)/opt/alt/ruby31"
  CONFIG["PACKAGE_URL"] = ""
  CONFIG["PACKAGE_BUGREPORT"] = ""
  CONFIG["PACKAGE_STRING"] = ""
  CONFIG["PACKAGE_VERSION"] = ""
  CONFIG["PACKAGE_TARNAME"] = ""
  CONFIG["PACKAGE_NAME"] = ""
  CONFIG["PATH_SEPARATOR"] = ":"
  CONFIG["SHELL"] = "/bin/sh"
  CONFIG["UNICODE_VERSION"] = "13.0.0"
  CONFIG["UNICODE_EMOJI_VERSION"] = "13.1"
  CONFIG["platform"] = "$(arch)"
  CONFIG["archdir"] = "$(rubyarchdir)"
  CONFIG["topdir"] = File.dirname(__FILE__)
  # Almost same with CONFIG. MAKEFILE_CONFIG has other variable
  # reference like below.
  #
  #   MAKEFILE_CONFIG["bindir"] = "$(exec_prefix)/bin"
  #
  # The values of this constant is used for creating Makefile.
  #
  #   require 'rbconfig'
  #
  #   print <<-END_OF_MAKEFILE
  #   prefix = #{RbConfig::MAKEFILE_CONFIG['prefix']}
  #   exec_prefix = #{RbConfig::MAKEFILE_CONFIG['exec_prefix']}
  #   bindir = #{RbConfig::MAKEFILE_CONFIG['bindir']}
  #   END_OF_MAKEFILE
  #
  #   => prefix = /usr/local
  #      exec_prefix = $(prefix)
  #      bindir = $(exec_prefix)/bin  MAKEFILE_CONFIG = {}
  #
  # RbConfig.expand is used for resolving references like above in rbconfig.
  #
  #   require 'rbconfig'
  #   p RbConfig.expand(RbConfig::MAKEFILE_CONFIG["bindir"])
  #   # => "/usr/local/bin"
  MAKEFILE_CONFIG = {}
  CONFIG.each{|k,v| MAKEFILE_CONFIG[k] = v.dup}

  # call-seq:
  #
  #   RbConfig.expand(val)         -> string
  #   RbConfig.expand(val, config) -> string
  #
  # expands variable with given +val+ value.
  #
  #   RbConfig.expand("$(bindir)") # => /home/foobar/all-ruby/ruby19x/bin
  def RbConfig::expand(val, config = CONFIG)
    newval = val.gsub(/\$\$|\$\(([^()]+)\)|\$\{([^{}]+)\}/) {
      var = $&
      if !(v = $1 || $2)
	'$'
      elsif key = config[v = v[/\A[^:]+(?=(?::(.*?)=(.*))?\z)/]]
	pat, sub = $1, $2
	config[v] = false
	config[v] = RbConfig::expand(key, config)
	key = key.gsub(/#{Regexp.quote(pat)}(?=\s|\z)/n) {sub} if pat
	key
      else
	var
      end
    }
    val.replace(newval) unless newval == val
    val
  end
  CONFIG.each_value do |val|
    RbConfig::expand(val)
  end

  # :nodoc:
  # call-seq:
  #
  #   RbConfig.fire_update!(key, val)               -> array
  #   RbConfig.fire_update!(key, val, mkconf, conf) -> array
  #
  # updates +key+ in +mkconf+ with +val+, and all values depending on
  # the +key+ in +mkconf+.
  #
  #   RbConfig::MAKEFILE_CONFIG.values_at("CC", "LDSHARED") # => ["gcc", "$(CC) -shared"]
  #   RbConfig::CONFIG.values_at("CC", "LDSHARED")          # => ["gcc", "gcc -shared"]
  #   RbConfig.fire_update!("CC", "gcc-8")                  # => ["CC", "LDSHARED"]
  #   RbConfig::MAKEFILE_CONFIG.values_at("CC", "LDSHARED") # => ["gcc-8", "$(CC) -shared"]
  #   RbConfig::CONFIG.values_at("CC", "LDSHARED")          # => ["gcc-8", "gcc-8 -shared"]
  #
  # returns updated keys list, or +nil+ if nothing changed.
  def RbConfig.fire_update!(key, val, mkconf = MAKEFILE_CONFIG, conf = CONFIG)
    return if mkconf[key] == val
    mkconf[key] = val
    keys = [key]
    deps = []
    begin
      re = Regexp.new("\\$\\((?:%1$s)\\)|\\$\\{(?:%1$s)\\}" % keys.join('|'))
      deps |= keys
      keys.clear
      mkconf.each {|k,v| keys << k if re =~ v}
    end until keys.empty?
    deps.each {|k| conf[k] = mkconf[k].dup}
    deps.each {|k| expand(conf[k])}
    deps
  end

  # call-seq:
  #
  #   RbConfig.ruby -> path
  #
  # returns the absolute pathname of the ruby command.
  def RbConfig.ruby
    File.join(
      RbConfig::CONFIG["bindir"],
      RbConfig::CONFIG["ruby_install_name"] + RbConfig::CONFIG["EXEEXT"]
    )
  end
end
CROSS_COMPILING = nil unless defined? CROSS_COMPILING
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