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Asked: 2026-05-18T10:01:33+00:00

I have searched high and low for a solution. I have both linecache19 and

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I have searched high and low for a solution. I have both linecache19 and ruby_core_source installed.

Neither of these commands will work:

gem install ruby-debug19
gem install ruby-debug19 -- --with-ruby-include=/Users/benjohnson/.rvm/src/ruby-1.9.1-p378

Here is the error I keep getting:

Building native extensions.  This could take a while...
ERROR:  Error installing ruby-debug19:
 ERROR: Failed to build gem native extension.

/Users/benjohnson/.rvm/rubies/ruby-1.9.1-p378/bin/ruby extconf.rb
checking for rb_method_entry_t.body in method.h... no
checking for vm_core.h... no
checking for rb_method_entry_t.body in method.h... no
checking for vm_core.h... yes
checking for iseq.h... yes
checking for insns.inc... yes
checking for insns_info.inc... yes
checking for eval_intern.h... yes
creating Makefile

make
gcc -I. -I/Users/benjohnson/.rvm/rubies/ruby-1.9.1-p378/include/ruby-1.9.1/i386-darwin10.4.0 -I/Users/benjohnson/.rvm/rubies/ruby-1.9.1-p378/include/ruby-1.9.1/ruby/backward -I/Users/benjohnson/.rvm/rubies/ruby-1.9.1-p378/include/ruby-1.9.1 -I. -DHAVE_VM_CORE_H -DHAVE_ISEQ_H -DHAVE_INSNS_INC -DHAVE_INSNS_INFO_INC -DHAVE_EVAL_INTERN_H -I/Users/benjohnson/.rvm/rubies/ruby-1.9.1-p378/include/ruby-1.9.1/ruby-1.9.1-p378 -fno-common  -O2 -g -Wall -Wno-parentheses  -fno-common -pipe -fno-common  -o breakpoint.o -c breakpoint.c
gcc -I. -I/Users/benjohnson/.rvm/rubies/ruby-1.9.1-p378/include/ruby-1.9.1/i386-darwin10.4.0 -I/Users/benjohnson/.rvm/rubies/ruby-1.9.1-p378/include/ruby-1.9.1/ruby/backward -I/Users/benjohnson/.rvm/rubies/ruby-1.9.1-p378/include/ruby-1.9.1 -I. -DHAVE_VM_CORE_H -DHAVE_ISEQ_H -DHAVE_INSNS_INC -DHAVE_INSNS_INFO_INC -DHAVE_EVAL_INTERN_H -I/Users/benjohnson/.rvm/rubies/ruby-1.9.1-p378/include/ruby-1.9.1/ruby-1.9.1-p378 -fno-common  -O2 -g -Wall -Wno-parentheses  -fno-common -pipe -fno-common  -o ruby_debug.o -c ruby_debug.c
ruby_debug.c: In function ‘ruby_method_ptr’:
ruby_debug.c:141: error: ‘rb_method_entry_t’ undeclared (first use in this function)
ruby_debug.c:141: error: (Each undeclared identifier is reported only once
ruby_debug.c:141: error: for each function it appears in.)
ruby_debug.c:141: error: ‘method’ undeclared (first use in this function)
ruby_debug.c:142: warning: implicit declaration of function ‘rb_method_entry’
ruby_debug.c: In function ‘debug_event_hook’:
ruby_debug.c:719: error: ‘rb_method_entry_t’ undeclared (first use in this function)
ruby_debug.c:719: error: ‘me’ undeclared (first use in this function)
make: *** [ruby_debug.o] Error 1


Gem files will remain installed in /Users/benjohnson/.rvm/gems/ruby-1.9.1-p378/gems/ruby-debug-base19-0.11.24 for inspection.
Results logged to /Users/benjohnson/.rvm/gems/ruby-1.9.1-p378/gems/ruby-debug-base19-0.11.24/ext/ruby_debug/gem_make.out
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1 Answer

  1. Editorial Team

    I have had the same issue (on 1.9.1 and 1.9.2). Even trying to install 0.11.23 triggered the error. I found that it was necessary to:

    • Uninstall the gem (all versions for me):

      gem uninstall ruby-debug-base19

    • Delete the 0.11.24 directory (in my case: ~/.rvm/gems/ruby-1.9.2-p0/gems/ruby-debug-base19-0.11.24/)

    • install 0.11.23 explicitly:

      gem install ruby-debug-base19 --version=0.11.23

    This is where I got most of the solution: http://rails.brentsowers.com/2010_08_01_archive.html

    Additionally, if you use Bundler:

    I had problems until I upgraded to latest Bundler (1.0.2 => 1.0.7) as it insisted on installing ruby-debug-base19 v 0.11.24).

    In your Gemfile, make sure you’ve pinned the version of ruby-debug-base19:

    gem "ruby-debug-base19", "0.11.23", :require => nil

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