RUBY_VERSION      132 ext/dl/dl.c        rb_define_const(rb_mDL, "BUILD_RUBY_VERSION",  rb_str_new2(RUBY_VERSION));
RUBY_VERSION     9109 ext/tk/tcltklib.c         + strlen(RUBY_VERSION)
RUBY_VERSION     9123 ext/tk/tcltklib.c             RUBY_VERSION, RUBY_RELEASE_DATE, 
RUBY_VERSION       19 version.c      const char ruby_version[] = RUBY_VERSION;
RUBY_VERSION       46 version.h          "ruby "RUBY_VERSION		    \