安装问题与红宝石和宝石rdiscount Windows 8的64位

Question

我试图让哲基尔和凉亭内的Windows 8

我已成功地安装Ruby的工作，和的devkit， 我试过，版本2.0.2，1.9 1.3和从http://railsinstaller.org/

Rails的安装程序，有一次我已按照以下，https://github.com/oneclick/rubyinstaller/wiki/Troubleshooting#wiki-gems_fails_comspec_autorun两个场景A和B，但也不是与我有关，

COMSPEC是我的cmd.exe的位置，我不有一个自动运行？

我可以运行gem install mysql而是试图做任何rdiscount提供了以下

c:\devkit>gem install rdiscount 
Temporarily enhancing PATH to include DevKit... 
Building native extensions. This could take a while... 
ERROR: Error installing rdiscount: 
ERROR: Failed to build gem native extension. 

C:/RailsInstaller/Ruby1.9.3/bin/ruby.exe extconf.rb 
checking for random()... *** extconf.rb failed *** 
Could not create Makefile due to some reason, probably lack of 
necessary libraries and/or headers. Check the mkmf.log file for more 
details. You may need configuration options. 

Provided configuration options: 
    --with-opt-dir 
    --without-opt-dir 
    --with-opt-include 
    --without-opt-include=${opt-dir}/include 
    --with-opt-lib 
    --without-opt-lib=${opt-dir}/lib 
    --with-make-prog 
    --without-make-prog 
    --srcdir=. 
    --curdir 
    --ruby=C:/RailsInstaller/Ruby1.9.3/bin/ruby 
    --with-rdiscount-dir 
    --without-rdiscount-dir 
    --with-rdiscount-include 
    --without-rdiscount-include=${rdiscount-dir}/include 
    --with-rdiscount-lib 
    --without-rdiscount-lib=${rdiscount-dir}/lib 
C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler 
failed to generate an executable file. (RuntimeError) 
You have to install development tools first. 
    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/mkmf.rb:461:in `try_link 0' 
    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/mkmf.rb:476:in `try_link' 
    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/mkmf.rb:619:in `try_func' 
    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/mkmf.rb:894:in `block in have_func' 
    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for' 
    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone' 
    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/mkmf.rb:254:in `open' 
    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone' 
    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/mkmf.rb:254:in `open' 
    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/mkmf.rb:280:in `postpone' 
    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for' 
    from C:/RailsInstaller/Ruby1.9.3/lib/ruby/1.9.1/mkmf.rb:893:in `have_fun c' 
    from extconf.rb:5:in `<main>' 


Gem files will remain installed in C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rdiscount-2.0.7.1 for inspection. 
Results logged to C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rdiscount-2.0.7.1/ext/gem_make.out 

如果我跑gem install jekyll我收到以下错误

porter.c:238:4: warning: passing argument 2 of 'ends' discards 'const' qualifier from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:240:7: warning: passing argument 2 of 'ends' discards 'const' qualifier from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' porter.c:240:7: warning: passing argument 2 of 'setto' discards 'const' qualifier from pointer target type [enabled by default] 
porter.c:196:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:241:7: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:241:7: warning: passing argument 2 of 'setto' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:196:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:242:7: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:242:7: warning: passing argument 2 of 'setto' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:196:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:249:7: warning: passing argument 2 of 'setto' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:196:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c: In function 'step1c': 
porter.c:257:4: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c: In function 'step2': 
porter.c:267:4: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:267:4: warning: passing argument 2 of 'r' discards 'const' qualifier fr 
om pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:268:14: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:268:14: warning: passing argument 2 of 'r' discards 'const' qualifier f 
rom pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:270:4: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:270:4: warning: passing argument 2 of 'r' discards 'const' qualifier fr 
om pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:271:14: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:271:14: warning: passing argument 2 of 'r' discards 'const' qualifier f 
rom pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:273:4: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:273:4: warning: passing argument 2 of 'r' discards 'const' qualifier fr 
om pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:275:4: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:275:4: warning: passing argument 2 of 'r' discards 'const' qualifier fr 
om pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:280:14: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:280:14: warning: passing argument 2 of 'r' discards 'const' qualifier f 
rom pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:281:14: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:281:14: warning: passing argument 2 of 'r' discards 'const' qualifier f 
rom pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:282:14: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:282:14: warning: passing argument 2 of 'r' discards 'const' qualifier f 
rom pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:283:14: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:283:14: warning: passing argument 2 of 'r' discards 'const' qualifier f 
rom pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:285:4: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:285:4: warning: passing argument 2 of 'r' discards 'const' qualifier fr 
om pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:286:14: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:286:14: warning: passing argument 2 of 'r' discards 'const' qualifier f 
rom pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:287:14: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:287:14: warning: passing argument 2 of 'r' discards 'const' qualifier f 
rom pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:289:4: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:289:4: warning: passing argument 2 of 'r' discards 'const' qualifier fr 
om pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:290:14: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:290:14: warning: passing argument 2 of 'r' discards 'const' qualifier f 
rom pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:291:14: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:291:14: warning: passing argument 2 of 'r' discards 'const' qualifier f 
rom pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:292:14: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:292:14: warning: passing argument 2 of 'r' discards 'const' qualifier f 
rom pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:294:4: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:294:4: warning: passing argument 2 of 'r' discards 'const' qualifier fr 
om pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:295:14: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:295:14: warning: passing argument 2 of 'r' discards 'const' qualifier f 
rom pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:296:14: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:296:14: warning: passing argument 2 of 'r' discards 'const' qualifier f 
rom pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:298:4: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:298:4: warning: passing argument 2 of 'r' discards 'const' qualifier fr 
om pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c: In function 'step3': 
porter.c:308:4: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:308:4: warning: passing argument 2 of 'r' discards 'const' qualifier fr 
om pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:309:14: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:309:14: warning: passing argument 2 of 'r' discards 'const' qualifier f 
rom pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:310:14: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:310:14: warning: passing argument 2 of 'r' discards 'const' qualifier f 
rom pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:312:4: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:312:4: warning: passing argument 2 of 'r' discards 'const' qualifier fr 
om pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:314:4: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:314:4: warning: passing argument 2 of 'r' discards 'const' qualifier fr 
om pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:315:14: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:315:14: warning: passing argument 2 of 'r' discards 'const' qualifier f 
rom pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c:317:4: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:317:4: warning: passing argument 2 of 'r' discards 'const' qualifier fr 
om pointer target type [enabled by default] 
porter.c:205:13: note: expected 'char *' but argument is of type 'const char *' 
porter.c: In function 'step4': 
porter.c:325:4: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:326:7: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:327:17: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:328:7: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:329:7: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:330:7: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:331:17: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:332:7: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:333:17: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:334:17: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:335:17: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:336:7: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:337:17: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:339:7: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:340:7: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:341:17: warning: passing argument 2 of 'ends' discards 'const' qualifie 
r from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:342:7: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:343:7: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
porter.c:344:7: warning: passing argument 2 of 'ends' discards 'const' qualifier 
from pointer target type [enabled by default] 
porter.c:182:12: note: expected 'char *' but argument is of type 'const char *' 
compiling porter_wrap.c 
In file included from c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby/ruby.h 
:1376:0, 
       from c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby.h:32, 
       from porter_wrap.c:1: 
c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby/missing.h:41:8: error: redef 
inition of 'struct timespec' 
In file included from c:\devkit\mingw\bin\../lib/gcc/i686-w64-mingw32/4.7.2/../. 
./../../i686-w64-mingw32/include/process.h:12:0, 
       from c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby/win32. 
h:62, 
       from c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby/define 
s.h:223, 
       from c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby/ruby.h 
:67, 
       from c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby.h:32, 
       from porter_wrap.c:1: 
c:\devkit\mingw\bin\../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686-w64-mingw 
32/include/sys/types.h:89:8: note: originally defined here 
In file included from c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby/ruby.h 
:1376:0, 
       from c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby.h:32, 
       from porter_wrap.c:1: 
c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby/missing.h:48:8: error: redef 
inition of 'struct timezone' 
In file included from c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby/win32. 
h:63:0, 
       from c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby/define 
s.h:223, 
       from c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby/ruby.h 
:67, 
       from c:/RailsInstaller/Ruby1.9.3/include/ruby-1.9.1/ruby.h:32, 
       from porter_wrap.c:1: 
c:\devkit\mingw\bin\../lib/gcc/i686-w64-mingw32/4.7.2/../../../../i686-w64-mingw 
32/include/time.h:260:8: note: originally defined here 
make: *** [porter_wrap.o] Error 1 

Gem files will remain installed in C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9 
.1/gems/fast-stemmer-1.0.2 for inspection. 
Results logged to C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/fast-stem 
mer-1.0.2/ext/gem_make.out 

c:\devkit> 

我也尝试重新安装/升级宝石，但没有我遵循似乎工作？

任何人都可以想到其他任何我可以尝试？或者指给我一些可以帮助的地方。

这是我第一次尝试Ruby，我没有多少运气。

感谢 肖恩

Answer 1

此问题固定rdiscount 2.0.7.2

gem install rdiscount -v 2.0.7.2 

Answer 2

问题不红宝石，RubyInstaller或的devkit，但RDiscount宝石上破窗户，看到报道issue #74。

您可以安装RDiscount的旧版本，如1.6.x版：

gem install rdiscount -v 1.6.8