Estoy intentando instalar Ruby 1.9.3 usando rvm. Sin embargo, cuando escribo:

rvm install 1.9.3

Obtuve el siguiente error

ERROR: Error running 'make ', please read /Users/nick/.rvm/log/ruby-1.9.3-rc1/make.log
ERROR: There has been an error while running make. Halting the installation.

Estoy ejecutando Mac OS X Lion y mi versión actual de Ruby es 1.9.2.

Edit: make.log:

make[1]: Entering directory `/Users/nick/.rvm/src/ruby-1.9.3/ext/readline'
/usr/bin/gcc-4.2 -I. -I../../.ext/include/x86_64-darwin11.0.0 -I../.././include -I../.././ext/readline -DRUBY_EXTCONF_H=\"extconf.h\" -I/Users/nick/.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[1]: Leaving directory `/Users/nick/.rvm/src/ruby-1.9.3/ext/readline'
make: *** [mkmain.sh] Error 1