title: Cannot for the life of me install Ruby on Mac OSX 10.7.5
body: <p>I swear, I have seen all the discussions of installing Ruby on stackoverflow...NOTHING helped. I have Xcode 4.1 installed as well as rvm 1.16.19.</p>
  
  <p>libksba is installed.</p>
  
  <p>There's SOME version of Ruby installed somehow but I don't know which version -- because if I execute ANY kind of Ruby command -- "ruby" by itself, "ruby --version," whatever, I get no response, and to get a prompt I have to ctrl/c.</p>
  
  <p>Using RVM or not, whenever I try to install ANY version of Ruby, I get this output:</p>
  
  <pre><code>Error running 'env LDFLAGS=-L/opt/sm/pkg/active/lib CFLAGS=-I/opt/sm/pkg/active/include CPATH=/opt/sm/pkg/active/include -L/Users/Dauber/.rvm/usr/lib ./configure --enable-shared --disable-install-doc --prefix=/Users/Dauber/.rvm/rubies/ruby-1.9.3-p286', please read /Users/Dauber/.rvm/log/ruby-1.9.3-p286/configure.log
  There has been an error while running configure. Halting the installation.
  ruby-1.9.3-p286 is not installed.
  </code></pre>
  
  <p>Here's the output from the aforementioned configure.log:</p>
  
  <pre><code>[2012-11-08 20:46:41] env LDFLAGS=-L/opt/sm/pkg/active/lib CFLAGS=-I/opt/sm/pkg/active/include CPATH=/opt/sm/pkg/active/include -L/Users/Dauber/.rvm/usr/lib ./configure --enable-shared --disable-install-doc --prefix=/Users/Dauber/.rvm/rubies/ruby-1.9.3-p286 --with-gcc=clang
  checking build system type... x86_64-apple-darwin11.4.2
  checking host system type... x86_64-apple-darwin11.4.2
  checking target system type... x86_64-apple-darwin11.4.2
  checking for C compiler default output file name... configure: error: C compiler cannot create executables
  See `config.log' for more details.
  </code></pre>
  
  <p>Now, a weird thing is that there's no file ANYWHERE in the system called "config.log," so I can't "see" it "for more details."</p>
  
  <p>Another weird thing...I've compiled dozens of C programs on this machine using gcc and gcc-4.2 -- and I just tried AGAIN and they work fine, so I don't know exactly what the deal is there...</p>
  
  <p>I've tried installing from <a href="https://github.com/kennethreitz/osx-gcc-installer" rel="nofollow">https://github.com/kennethreitz/osx-gcc-installer</a> to no avail; it made absolutely no difference.</p>
  
  <p>This is all on my MacBook, running OSX 10.7.5. What's weird is...I've had ZERO problems on my iMac running the exact same version of Lion...in fact, I didn't even NEED to install Ruby - it happened to have 1.9.2 already on it; I just needed to add Rails and all worked perfectly...what the heck is so different that I can't get this stuff working on my MacBook???</p>
  
  <p>AFTER PRUSSWAN'S LINK:
  Long story short, the other post prusswan linked to mentioned that there's a bug in the Rails installer and that /etc/rvmrc needed to be changed. I made the changes but got the exact same error message as before when I tried to install ruby. This is what configure.log says now, though:</p>
  
  <pre><code>[2012-11-08 22:42:08] env LDFLAGS=-L/opt/sm/pkg/active/lib -L/Users/Dauber/.rvm/usr/lib CFLAGS=-I/opt/sm/pkg/active/include -I/Users/Dauber/.rvm/usr/include CPATH=/opt/sm/pkg/active/include ./configure --enable-shared --disable-install-doc --prefix=/Users/Dauber/.rvm/rubies/ruby-1.9.3-p286
  current path: /Users/Dauber/.rvm/src/ruby-1.9.3-p286
  command(8): env LDFLAGS=-L/opt/sm/pkg/active/lib -L/Users/Dauber/.rvm/usr/lib CFLAGS=-I/opt/sm/pkg/active/include -I/Users/Dauber/.rvm/usr/include CPATH=/opt/sm/pkg/active/include ./configure --enable-shared --disable-install-doc --prefix=/Users/Dauber/.rvm/rubies/ruby-1.9.3-p286
  checking build system type... x86_64-apple-darwin11.4.2
  checking host system type... x86_64-apple-darwin11.4.2
  checking target system type... x86_64-apple-darwin11.4.2
  checking for C compiler default output file name... a.out
  checking whether the C compiler works... yes
  checking whether we are cross compiling... no
  checking for suffix of executables... 
  checking for suffix of object files... o
  checking whether we are using the GNU C compiler... yes
  checking whether gcc-4.2 accepts -g... yes
  checking for gcc-4.2 option to accept ISO C89... none needed
  checking whether we are using the GNU C++ compiler... yes
  checking whether g++-4.2 accepts -g... yes
  checking how to run the C preprocessor... gcc-4.2 -E
  checking for grep that handles long lines and -e... /usr/bin/grep
  checking for egrep... /usr/bin/grep -E
  checking whether gcc-4.2 needs -traditional... no
  checking whether the linker is GNU ld... no
  checking whether gcc-4.2 -E accepts -o... yes
  checking for real target cpu... x86_64
  checking for ranlib... ranlib
  checking for ar... ar
  checking for as... as
  checking for objdump... no
  checking for gobjdump... no
  checking for objcopy... no
  checking for gobjcopy... no
  checking for nm... nm
  checking whether ln -s works... yes
  checking whether make sets $(MAKE)... yes
  checking for a BSD-compatible install... /usr/bin/install -c
  checking for a thread-safe mkdir -p...  -d
  use 'mkdir -p' as MKDIR_P
  checking for dot... no
  checking for doxygen... no
  checking for pkg-config... pkg-config
  checking for AIX... no
  checking for ANSI C header files... yes
  checking for sys/types.h... yes
  checking for sys/stat.h... yes
  checking for stdlib.h... yes
  checking for string.h... yes
  checking for memory.h... yes
  checking for strings.h... yes
  checking for inttypes.h... yes
  checking for stdint.h... yes
  checking for unistd.h... yes
  checking minix/config.h usability... no
  checking minix/config.h presence... no
  checking for minix/config.h... no
  checking whether it is safe to define __EXTENSIONS__... yes
  checking for cd using physical directory... cd -P
  checking whether -Wno-unused-parameter is accepted... yes
  checking whether -Wno-parentheses is accepted... yes
  checking whether -Wno-long-long is accepted... yes
  checking whether -Wno-missing-field-initializers is accepted... yes
  checking whether -Werror=pointer-arith is accepted... yes
  checking whether -Werror=write-strings is accepted... yes
  checking whether -Werror=declaration-after-statement is accepted... yes
  checking whether -Werror=shorten-64-to-32 is accepted... yes
  checking whether -Werror=implicit-function-declaration is accepted... yes
  checking whether -Wall -Wextra is accepted... yes
  checking whether -ggdb is accepted... yes
  checking whether -fvisibility=hidden is accepted... yes
  checking whether -Wl,-unexported_symbol,_Init_* is accepted... yes
  checking for special C compiler options needed for large files... no
  checking for _FILE_OFFSET_BITS value needed for large files... no
  checking for _LARGE_FILES value needed for large files... no
  checking whether byte ordering is bigendian... no
  checking for an ANSI C-conforming const... yes
  checking whether char is unsigned... no
  checking for inline... inline
  checking for working volatile... yes
  checking for long long... yes
  checking for off_t... yes
  checking char bit... ./configure: line 8508: syntax error near unexpected token `rb_cv_char_bit,'
  ./configure: line 8508: `    AC_COMPUTE_INT(rb_cv_char_bit, CHAR_BIT,'
  </code></pre>
  
  <p>So it looks like the ./configure file that's generated generates with a typo or something...</p>