Can't install Ruby under Lion with RVM – GCC issues
Solution 1
This answer was edited multiple times and now contains several alternative solutions. Try the simple “Edit 3” solution first.
Ruby 1.9.3-p125 and later have official support for clang, so if you are installing such a version you should not need GCC. If you’re installing an older version of Ruby, read on.
To compile Ruby with GCC, you need a non-LLVM version of GCC, which is no longer included with Xcode 4.2. Install it yourself (or downgrade to Xcode 4.1 temporarily), then do CC=/usr/local/bin/gcc-4.2 rvm install 1.9.3 --enable-shared
(substituting the path to your non-LLVM gcc).
Edit: https://github.com/kennethreitz/osx-gcc-installer/downloads may help for installing GCC. There is also some info available by running rvm requirements
.
Edit 2: For an easier solution, you can try adding --with-gcc=clang
to the arguments to configure
for Ruby to use clang instead of GCC.
Edit 3: rvm install 1.9.3 --with-gcc=clang
does that for you.
Note: With current versions of Xcode you need to install the command-line tools separately from the Xcode menu -> Preferences -> Downloads -> Components. This is a pre-requisite for doing any compiling with Xcode on the command-line, not just Ruby.
Note 2: If something doesn't work after following the steps, try doing a reboot or re-login to ensure that the environment gets set correctly.
Note 3: Ruby versions prior to 1.9.3-p125 may not always be fully compatible with clang, so test your software thoroughly if using the “edit 3” solution in a production environment.
Solution 2
SUMMARY FOR STACK OVERFLOW
I was trying to install SiriProxy on a clean Lion installation on Xcode from App Store
I kept getting errors like : The provided CC(/usr/bin/gcc) is LLVM based.
bash-3.2$ rvm install 1.9.3
ERROR: The provided CC(/usr/bin/gcc) is LLVM based, it is not yet fully supported by ruby and gems, please read `rvm requirements`.
After 2 days finally got it working with these two lines:
http://stackoverflow.com/questions/8000145/ruby-rvm-llvm-and-mysql
bash-3.2$ rvm get head
bash-3.2$ CC=/usr/bin/gcc-4.2 rvm install 1.9.3 --enable-shared
Before that I had tried every stackoverflow article on Ruby and Lion so doing these may have done some setup that helped the above 2 steps work:
Things I tried included:
Running Install Xcode.app (I had downloaded from App Store - running this does futher installation)
Installing
https://github.com/kennethreitz/osx-gcc-installer/downloads may help for installing GCC.
Set up CC in
more /Users//.bash_profile
bash-3.2$ more /Users/<USERNAME>/.bash_profile
[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm" # Load RVM function
export CC=/usr/share/TargetConfigs/bin/gcc
First line came from SiriProxy install instruction https://github.com/plamoni/SiriProxy
2nd line export CC never seemed to work. So dont add.
It had many versions each pointing I finally used CC=/usr/bin/gcc-4.2 rvm install 1.9.3 --enable-shared
Solution 3
rvm install 1.9.3 --with-gcc=clang
Worked for me. This was on a brand new Lion with Xcode (had no "traditional" GCC).
Solution 4
OK I didn't have to install gcc-4.2 separately, I used the one delivered in Xcode, but I had an issue where the --with-gcc=clang
wasn't getting passed through. Added the following line to my .rvmrc
:
export rvm_configure_flags="--with-gcc=clang"
Worked as required
rvm upgrade ruby-1.9.2-p290 ruby-1.9.3-p125
...
ruby-1.9.3-p125 - #extracted to /Users/leif/.rvm/src/ruby-1.9.3-p125 (already extracted)
ruby-1.9.3-p125 - #configuring
ruby-1.9.3-p125 - #compiling
ruby-1.9.3-p125 - #installing
....
Successfully migrated ruby-1.9.2-p290 to ruby-1.9.3-p125
Upgrade complete!
bang:$ ruby -v
ruby 1.9.3p125 (2012-02-16 revision 34643) [x86_64-darwin11.3.0]
Note my env is the following
OS
Darwin bang.local 11.3.0 Darwin Kernel Version 11.3.0: Thu Jan 12 18:47:41 PST 2012; root:xnu-1699.24.23~1/RELEASE_X86_64 x86_64
Xcode
Xcode 4.2.1 Build 4D502
GCC
i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.1.00)
lrwxr-xr-x 1 root wheel 12 22 Dec 21:30 /usr/bin/gcc -> llvm-gcc-4.2
I tried using the answer of passing --with-gcc=clang
on the command line to the rvm upgrade command, but it didn't work, it didn't appear to get pass from rvm to configure. Apparently the problem in RVM of arguments not being passed to configure is fixed (in commit 1641ceb0
in 2011), but even after upgrading RVM to latest (via rvm get latest
) it still didn't get passed. Using the .rvmrc
file was the only way it would work for me.
Solution 5
You can try to install Command Line Tools for Xcode, it includes GCC, LLMV and other tools that excluded in Xcode 4.2 and higher.
Related videos on Youtube
Comments
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Jamie Schembri over 2 years
Most questions regarding this problem are due to missing Xcode; I have Xcode 4.2 installed.
Install attempt:
rvm install 1.9.3 Installing Ruby from source to: /Users/jamie/.rvm/rubies/ruby-1.9.3-p0, this may take a while depending on your cpu(s)... ruby-1.9.3-p0 - #fetching ruby-1.9.3-p0 - #extracted to /Users/jamie/.rvm/src/ruby-1.9.3-p0 (already extracted) Fetching yaml-0.1.4.tar.gz to /Users/jamie/.rvm/archives Extracting yaml-0.1.4.tar.gz to /Users/jamie/.rvm/src Configuring yaml in /Users/jamie/.rvm/src/yaml-0.1.4. Compiling yaml in /Users/jamie/.rvm/src/yaml-0.1.4. Installing yaml to /Users/jamie/.rvm/usr ruby-1.9.3-p0 - #configuring ERROR: Error running ' ./configure --prefix=/Users/jamie/.rvm/rubies/ruby-1.9.3-p0 --enable-shared --disable-install-doc --with-libyaml-dir=/Users/jamie/.rvm/usr ', please read /Users/jamie/.rvm/log/ruby-1.9.3-p0/configure.log ERROR: There has been an error while running configure. Halting the installation.
configure.log:
[2011-11-07 04:32:17] ./configure --prefix=/Users/jamie/.rvm/rubies/ruby-1.9.3-p0 --enable-shared --disable-install-doc --with-libyaml-dir=/Users/jamie/.rvm/usr configure: WARNING: unrecognized options: --with-libyaml-dir checking build system type... x86_64-apple-darwin11.2.0 checking host system type... x86_64-apple-darwin11.2.0 checking target system type... x86_64-apple-darwin11.2.0 checking whether the C compiler works... no configure: error: in `/Users/jamie/.rvm/src/ruby-1.9.3-p0': configure: error: C compiler cannot create executables See `config.log' for more details
GCC is available:
gcc -v Using built-in specs. Target: i686-apple-darwin11 Configured with: /private/var/tmp/llvmgcc42/llvmgcc42-2336.1~1/src/configure --disable-checking --enable-werror --prefix=/Developer/usr/llvm-gcc-4.2 --mandir=/share/man --enable-languages=c,objc,c++,obj-c++ --program-prefix=llvm- --program-transform-name=/^[cg][^.-]*$/s/$/-4.2/ --with-slibdir=/usr/lib --build=i686-apple-darwin11 --enable-llvm=/private/var/tmp/llvmgcc42/llvmgcc42-2336.1~1/dst-llvmCore/Developer/usr/local --program-prefix=i686-apple-darwin11- --host=x86_64-apple-darwin11 --target=i686-apple-darwin11 --with-gxx-include-dir=/usr/include/c++/4.2.1 Thread model: posix gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.1.00) ls /usr/bin | grep gcc gcc i686-apple-darwin11-llvm-gcc-4.2 llvm-gcc llvm-gcc-4.2
Based on config.log (posted at bottom due to size) I tried symlinking gcc-4.2 to gcc and then installing:
rvm install 1.9.3 ERROR: The autodetected CC(/usr/bin/gcc-4.2) is LLVM based, it is not yet fully supported by ruby and gems, please read `rvm requirements`, and set CC=/path/to/gcc .
So I could probably just grab gcc elsewhere, but I'm mostly concerned as to why this is happening. Shouldn't installing Xcode be enough?
config.log:
This file contains any messages produced by compilers while running configure, to aid debugging if configure makes a mistake. It was created by configure, which was generated by GNU Autoconf 2.68. Invocation command line was $ ./configure --prefix=/Users/jamie/.rvm/rubies/ruby-1.9.3-p0 --enable-shared --disable-install-doc --with-libyaml-dir=/Users/jamie/.rvm/usr ## --------- ## ## Platform. ## ## --------- ## hostname = Wilson.local uname -m = x86_64 uname -r = 11.2.0 uname -s = Darwin uname -v = Darwin Kernel Version 11.2.0: Tue Aug 9 20:54:00 PDT 2011; root:xnu-1699.24.8~1/RELEASE_X86_64 /usr/bin/uname -p = i386 /bin/uname -X = unknown /bin/arch = unknown /usr/bin/arch -k = unknown /usr/convex/getsysinfo = unknown /usr/bin/hostinfo = Mach kernel version: Darwin Kernel Version 11.2.0: Tue Aug 9 20:54:00 PDT 2011; root:xnu-1699.24.8~1/RELEASE_X86_64 Kernel configured for up to 4 processors. 4 processors are physically available. 4 processors are logically available. Processor type: i486 (Intel 80486) Processors active: 0 1 2 3 Primary memory available: 8.00 gigabytes Default processor set: 110 tasks, 546 threads, 4 processors Load average: 1.28, Mach factor: 2.71 /bin/machine = unknown /usr/bin/oslevel = unknown /bin/universe = unknown PATH: /Users/jamie/.rvm/usr/bin PATH: /usr/bin PATH: /bin PATH: /usr/sbin PATH: /sbin PATH: /usr/local/bin PATH: /usr/X11/bin PATH: /Users/jamie/bin PATH: /Users/jamie/.rvm/bin PATH: /Users/jamie/.rvm/bin ## ----------- ## ## Core tests. ## ## ----------- ## configure:2764: checking build system type configure:2778: result: x86_64-apple-darwin11.2.0 configure:2849: checking host system type configure:2862: result: x86_64-apple-darwin11.2.0 configure:2882: checking target system type configure:2895: result: x86_64-apple-darwin11.2.0 configure:3376: checking for C compiler version configure:3385: gcc-4.2 --version >&5 ./configure: line 3387: gcc-4.2: command not found configure:3396: $? = 127 configure:3385: gcc-4.2 -v >&5 ./configure: line 3387: gcc-4.2: command not found configure:3396: $? = 127 configure:3385: gcc-4.2 -V >&5 ./configure: line 3387: gcc-4.2: command not found configure:3396: $? = 127 configure:3385: gcc-4.2 -qversion >&5 ./configure: line 3387: gcc-4.2: command not found configure:3396: $? = 127 configure:3416: checking whether the C compiler works configure:3438: gcc-4.2 conftest.c >&5 ./configure: line 3440: gcc-4.2: command not found configure:3442: $? = 127 configure:3480: result: no configure: failed program was: | /* confdefs.h */ | #define PACKAGE_NAME "" | #define PACKAGE_TARNAME "" | #define PACKAGE_VERSION "" | #define PACKAGE_STRING "" | #define PACKAGE_BUGREPORT "" | #define PACKAGE_URL "" | #define CANONICALIZATION_FOR_MATHN 1 | /* end confdefs.h. */ | | int | main () | { | | ; | return 0; | } configure:3485: error: in `/Users/jamie/.rvm/src/ruby-1.9.3-p0': configure:3487: error: C compiler cannot create executables See `config.log' for more details ## ---------------- ## ## Cache variables. ## ## ---------------- ## ac_cv_build=x86_64-apple-darwin11.2.0 ac_cv_env_CCC_set= ac_cv_env_CCC_value= ac_cv_env_CC_set= ac_cv_env_CC_value= ac_cv_env_CFLAGS_set= ac_cv_env_CFLAGS_value= ac_cv_env_CPPFLAGS_set= ac_cv_env_CPPFLAGS_value= ac_cv_env_CPP_set= ac_cv_env_CPP_value= ac_cv_env_CXXFLAGS_set= ac_cv_env_CXXFLAGS_value= ac_cv_env_CXX_set= ac_cv_env_CXX_value= ac_cv_env_LDFLAGS_set= ac_cv_env_LDFLAGS_value= ac_cv_env_LIBS_set= ac_cv_env_LIBS_value= ac_cv_env_build_alias_set= ac_cv_env_build_alias_value= ac_cv_env_host_alias_set= ac_cv_env_host_alias_value= ac_cv_env_target_alias_set= ac_cv_env_target_alias_value= ac_cv_host=x86_64-apple-darwin11.2.0 ac_cv_prog_CC=gcc-4.2 ac_cv_target=x86_64-apple-darwin11.2.0 ## ----------------- ## ## Output variables. ## ## ----------------- ## ALLOCA='' AR='' ARCHFILE='' ARCH_FLAG='' AS='' ASFLAGS='' BASERUBY='ruby' BUILTIN_ENCOBJS='' BUILTIN_TRANSOBJS='' BUILTIN_TRANSSRCS='' CAPITARGET='' CC='gcc-4.2' CCDLFLAGS='' CFLAGS='' CHDIR='' COMMON_HEADERS='' COMMON_LIBS='' COMMON_MACROS='' COUTFLAG='' CP='' CPP='' CPPFLAGS='' CPPOUTFILE='' CXX='g++-4.2' CXXFLAGS='' DEFS='' DLDFLAGS='' DLDLIBS='' DLEXT2='' DLEXT='' DLLWRAP='' DOT='' DOXYGEN='' ECHO_C='\c' ECHO_N='' ECHO_T='' EGREP='' ENABLE_SHARED='' EXECUTABLE_EXTS='' EXEEXT='' EXPORT_PREFIX='' EXTOUT='' EXTSTATIC='' GCC='' GNU_LD='' GREP='' INSTALLDOC='' INSTALL_DATA='' INSTALL_PROGRAM='' INSTALL_SCRIPT='' LDFLAGS='' LDSHARED='' LDSHAREDXX='' LIBEXT='' LIBOBJS='' LIBPATHENV='' LIBPATHFLAG='' LIBRUBY='' LIBRUBYARG='' LIBRUBYARG_SHARED='' LIBRUBYARG_STATIC='' LIBRUBY_A='' LIBRUBY_ALIASES='' LIBRUBY_DLDFLAGS='' LIBRUBY_LDSHARED='' LIBRUBY_RELATIVE='' LIBRUBY_SO='' LIBS='' LINK_SO='' LN_S='' LTLIBOBJS='' MAINLIBS='' MAJOR='1' MAKEDIRS='' MAKEFILES='' MANTYPE='' MINIOBJS='' MINIRUBY='' MINOR='9' MKDIR_P='' NM='' NROFF='' NULLCMD='' OBJCOPY='' OBJDUMP='' OBJEXT='' OUTFLAG='' PACKAGE='' PACKAGE_BUGREPORT='' PACKAGE_NAME='' PACKAGE_STRING='' PACKAGE_TARNAME='' PACKAGE_URL='' PACKAGE_VERSION='' PATH_SEPARATOR=':' PKG_CONFIG='' PREP='' RANLIB='' RDOCTARGET='' RI_BASE_NAME='' RM='' RMALL='' RMDIR='' RMDIRS='' RPATHFLAG='' RUBYW_BASE_NAME='rubyw' RUBYW_INSTALL_NAME='' RUBY_BASE_NAME='ruby' RUBY_INSTALL_NAME='' RUBY_PROGRAM_VERSION='1.9.3' RUBY_RELEASE_DATE='2011-10-30' RUBY_SO_NAME='' RUNRUBY='' SET_MAKE='' SHELL='/bin/sh' SOLIBS='' STATIC='' STRIP='' SYMBOL_PREFIX='' TEENY='1' TEST_RUNNABLE='' THREAD_MODEL='' TRY_LINK='' UNIVERSAL_ARCHNAMES='' UNIVERSAL_INTS='' USE_RUBYGEMS='' WERRORFLAG='' WINDRES='' XCFLAGS='' XLDFLAGS='' XRUBY='' XRUBY_LIBDIR='' XRUBY_RUBYHDRDIR='' XRUBY_RUBYLIBDIR='' ac_ct_CC='' ac_ct_CXX='' ac_ct_OBJCOPY='' ac_ct_OBJDUMP='' arch='' bindir='${exec_prefix}/bin' build='x86_64-apple-darwin11.2.0' build_alias='' build_cpu='x86_64' build_os='darwin11.2.0' build_vendor='apple' cflags=' ${optflags} ${debugflags} ${warnflags}' configure_args='' cppflags='' cxxflags=' ${optflags} ${debugflags} ${warnflags}' datadir='${datarootdir}' datarootdir='${prefix}/share' debugflags='' docdir='${datarootdir}/doc/${PACKAGE}' dvidir='${docdir}' exec='' exec_prefix='NONE' host='x86_64-apple-darwin11.2.0' host_alias='' host_cpu='x86_64' host_os='darwin11.2.0' host_vendor='apple' htmldir='${docdir}' includedir='${prefix}/include' infodir='${datarootdir}/info' libdir='${exec_prefix}/lib' libexecdir='${exec_prefix}/libexec' localedir='${datarootdir}/locale' localstatedir='${prefix}/var' mandir='${datarootdir}/man' oldincludedir='/usr/include' optflags='' pdfdir='${docdir}' prefix='/Users/jamie/.rvm/rubies/ruby-1.9.3-p0' program_transform_name='s&^&&' psdir='${docdir}' ridir='' ruby_pc='' ruby_version='' rubyhdrdir='' rubylibprefix='' rubyw_install_name='' sbindir='${exec_prefix}/sbin' setup='' sharedstatedir='${prefix}/com' sitearch='' sitedir='' sitehdrdir='' sysconfdir='${prefix}/etc' target='x86_64-apple-darwin11.2.0' target_alias='' target_cpu='x86_64' target_os='darwin11.2.0' target_vendor='apple' try_header='' vendordir='' vendorhdrdir='' warnflags='' ## ----------- ## ## confdefs.h. ## ## ----------- ## /* confdefs.h */ #define PACKAGE_NAME "" #define PACKAGE_TARNAME "" #define PACKAGE_VERSION "" #define PACKAGE_STRING "" #define PACKAGE_BUGREPORT "" #define PACKAGE_URL "" #define CANONICALIZATION_FOR_MATHN 1 configure: exit 77
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mu is too short over 12 yearsHave you tried setting
CC=/usr/bin/gcc
? -
mu is too short over 12 yearsAnything interesting in the
config.log
file? -
Dave Newton over 12 yearsHmm; I have the same gcc, and it installed fine :( Second thing on SO that has worked fine for me but not for someone else; usually it's the opposite.
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Jamie Schembri over 12 yearsmu: I've added the whole config.log now. Nothing unusual to my eyes. This is the version without a symlink. Dave: Well, that's computers :-).
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ma11hew28 over 11 yearsThanks to help from @mpapis, I've documented How to Install RVM on Mac OS X 10.8 (Mountain Lion) with Xcode 4.5 without Installing Command Line Tools.
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Jamie Schembri over 12 yearsThe GCC-10.7.pkg didn't do it for me – I think it may only work on 10.7.0 (I'm running 10.7.2), but perhaps the v2 pkg works. Anyway, --with-gcc=clang did it for me! Thanks!
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Geoff Lanotte over 12 yearsThank you, this was a real time saver for me.
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echo over 12 yearsThanks, Edit 3 fixed it for me too.
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leandro over 12 yearsedit3 didn'work for me (Xcode 4.2.1), but after installing readline
rvm pkg install readline
and passing an extra parameterrvm install 1.9.3 --with-gcc=clang --with-readline-dir=$rvm_path/usr
it installed successfully. -
A-Dubb over 12 yearsMan...thank you for edit3. I have to vote you up for that. Thank you man
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Arkku over 12 yearsDid you try
rvm install 1.9.3 --with-gcc=clang
? -
JP. over 12 yearsEdit3 : doesn't work, Try to install the gcc separately from github.com/kennethreitz/osx-gcc-installer/downloads
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jbnunn over 12 yearsEdit 3, boom! Did 1.9.2 instead of 1.9.3 with no problem
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lukecampbell over 12 yearsThank you so much!, we can finally work on these ruby projects with our lion machines again! You are a life saver!
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wasabi over 12 yearsEdit 3 Initially didn't work for me, but after restarting my machine it worked. Thanks!
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harsha over 12 yearsThanks edit 3 worked straight away (OS X 10.7.2) for ruby 1.9.3
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Bret Fisher over 12 yearsFor me on OS X 10.7.2 with Xcode 4.2.1 already installed I needed to download/install the GCC as suggested, then reinstall xcode 4.2.1, then new terminal window and finally edit 3 worked. Thanks.
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Florin over 12 yearsCC=/usr/bin/gcc-4.2 rvm install 1.9.3 --enable-shared, worked on Snow Leopard with Xcode 4.2, thank you!
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Nubzor over 12 yearsjust tell configure to search for
correct
gcc - see my answer below -
Arkku over 12 yearsNote that the OP symlinked
gcc
togcc-4.2
, which made the command available but revealed the underlying problem that theirgcc
was actuallyllvm-gcc
(and no non-LLVM GCC was installed). -
Arkku over 12 years@stefanB That's basically what the solution in edits 2 & 3 is, except that many users will not have the “correct” (non-LLVM)
gcc
installed and thereforeclang
is the better choice. (See comments above; edit 3 is the simple one-liner that apparently works for most people.) -
jerseyboy over 12 yearsThe comment by leandro helped me. It may apply to Lion / XCode 4.2 users if Edit 3 still fails with the messages "checking whether the C compiler works... no configure: error: in `/Users/someone/.rvm/src/yaml-0.1.4': configure: error: C compiler cannot create executables" in the configure.log
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jrhorn424 over 12 yearsAs noted in this answer, there is another alternative.
rvm install 1.9.3 --with-gcc=clang
worked for me, but it is not fully supported. You can also useCC=/usr/bin/gcc-4.2 rvm install 1.9.3 --enable-shared
, which seems better supported. I usedosx-gcc-installer
to get 4.2, I believe. -
Eric Hu over 12 yearsI'd advise against
rvm get head
for other users. This pulls from the head of the git repo and may not be stable.rvm get latest
grabs the latest stable version. If this doesn't fix this issue for you, thervm install 1.9.3 --with-gcc=clang
is worth a shot first since it's less likely to introduce side effects -
Shane over 12 yearsI had to run rvm cleanup sources then --with-gcc=clang worked
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tomato over 12 yearsI'm on Lion with XCode 4.3.1 installed and the latest RVM (1.10.2). The only approach which worked for me was
sudo CC=/usr/bin/gcc-4.2 rvm install 1.9.3 --enable-shared
. Edit 3 just didn't work for me. -
Arkku over 12 years@tomtheguvnor Hmm, I just tried this again with the same versions of XCode, RVM, and Lion, and it worked with edit 3. Did you install the command-line tools from XCode 4.3.1 preferences?
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tomato over 12 years@Arkku No I hadn't installed the command-line tools. I just installed them and retried installing 1.9.3 using
sudo rvm install 1.9.3 --with-gcc=clang
and it worked! So thanks. Perhaps update edit 3 to hint that you need command-line tools installed? -
Guillermo Guerini about 12 yearsAnd if nothing that was written above works and you already tried "rvm install 1.9.3", try this: "rvm reinstall 1.9.3". It will work!
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John K. Chow almost 12 yearsUnfortunately, using the clang compiler actually caused a ton of seg faults. I had to use the older GCC compiler via homebrew, and the seg faults went away. Just wanted to add this in case it helps someone in the future.
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Arkku almost 12 years@JohnK.Chow Do you mean segfaults when compiling or when running Ruby? I haven't experienced either problem, and I've been running the clang-compiled version ever since before posting this answer.
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John K. Chow almost 12 years@Arkku When running Ruby, specifically when we're running our rspec. I'm running OSX Mountain Lion. Even on our Ubuntu machine (12.04 LTS), it had the exact same seg faults. For our Ubuntu machine, we were running 4.4.1. On our Ubuntu machines, we re-compiled our Ruby with 4.2.3 GCC, and it works like a charm.
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ma11hew28 over 11 yearsI have discovered a truly marvelous solution to this, which this character-limit is too short to contain. ;) stackoverflow.com/a/12737471/242933
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Andres about 11 yearsFixed! "With current versions of XCode you need to install the command-line tools separately from the XCode menu -> Preferences -> Downloads -> Components. This is a pre-requisite for doing any compiling with XCode on the command-line, not just Ruby." Just install the command line tools. That's it.