Compiling Ruby 1.9.2 with OS X 10.7

I had to setup a machine which ran 10.7 with Ruby 1.9.2 because the application ran on this version. It was a rails application of version 3.1.

I tried to get the machine set up with rbenv which went smooth.

I tried to do a

rbenv install 1.9.2-p180

Which did not go well at all.

I got errors like

/usr/bin/gcc-4.2 -dynamic -bundle -o ../../../.ext/x86_64-darwin11.3.0/racc/cparse.bundle cparse.o -L. -L../../.. -L/Users/jasonvdm/.rvm/usr/lib -L. -L/usr/local/lib -Wl,-undefined,dynamic_lookup -Wl,-multiply_defined,suppress -Wl,-flat_namespace  -lruby.1.9.1  -lpthread -ldl -lobjc 
compiling readline/usr/bin/gcc-4.2 -I. -I../../.ext/include/x86_64-darwin11.3.0 -I../.././include -I../.././ext/readline -DRUBY_EXTCONF_H=\"extconf.h\" -I/Users/jasonvdm/.rvm/usr/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE   -fno-common -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wshorten-64-to-32 -Wno-long-long  -fno-common -pipe  -o readline.o -c readline.c
readline.c: In function ‘username_completion_proc_call’:
readline.c:1386: error: ‘username_completion_function’ undeclared (first use in this function)
readline.c:1386: error: (Each undeclared identifier is reported only once
readline.c:1386: error: for each function it appears in.)
make[1]: *** [readline.o] Error 1
make: *** [mkmain.sh] Error 1

Which essential means that I needed to update the readline library to this error out of the way. I started out by downloading the readline version 6.1 manually and installing but that failed miserably.

curl -O ftp://ftp.gnu.org/gnu/readline/readline-6.1.tar.gz
tar xzvf readline-6.1.tar.gz
cd readline-6.1
./configure --prefix=/usr/local
make
sudo make install

Then I read this which saved me a lot of time. It essentially says to install readline via rvm. rvm was already installed in the system and readline got installed by the command.

rvm pkg install readline

Be sure to install the ruby version using the --with-readline-dir option. Like so

rvm reinstall 1.9.2 --with-readline-dir=$rvm_path/usr

Now when you try to install with this line, you might get it installed or you might get some errors like

ld: in /usr/local/lib/libiconv.2.dylib, missing required architecture x86_64 in file

collect2: ld returned 1 exit status

make[1]: *** [../../.ext/x86_64-darwin10.5.0/tcltklib.bundle] Error 1

make: *** [mkmain.sh] Error 1

Well, this means that you might have a wrong dylib file version on the machine.

The first this we need to look at now is whether we have XCode. If you have XCode and the version is 4.2 then you will have to check for this file in

/usr/lib/libiconv.2.dylib

Try to execute a file command on this

file /usr/lib/libiconv.2.dylib 
/usr/lib/libiconv.2.dylib: Mach-O universal binary with 3 architectures
/usr/lib/libiconv.2.dylib (for architecture x86_64): Mach-O 64-bit dynamically linked shared library x86_64 
/usr/lib/libiconv.2.dylib (for architecture i386): Mach-O dynamically linked shared library i386 
/usr/lib/libiconv.2.dylib (for architecture ppc7400): Mach-O dynamically linked shared library ppc

Find the x68_64 and you are in luck !

Just remove the old dylib and link the new one like so :

rm /usr/local/lib/libiconv.2.dylib
ln -s /usr/lib/libiconv.2.dylib /usr/local/lib/libiconv.2.dylib

Now running the rvm install works great !

Kudos !!!

References:
http://hello.keewooi.com/ruby-1-9-3-preview-1-available-now/
http://forums.pragprog.com/forums/148/topics/9975
http://geekyninja.blogspot.de/2010/12/installing-ruby-192-with-rvm.html
http://stackoverflow.com/questions/5426892/trouble-installing-ruby-1-9-2-with-rvm-mac-os-x
http://stackoverflow.com/questions/3703792/ld-symbols-not-found-when-linking
http://stackoverflow.com/questions/7962550/error-installing-ruby-1-9-3
https://rvm.io/packages/readline/
http://stackoverflow.com/questions/8675194/error-installing-1-9-3-with-rvm-on-lion