# Rrdtool gem **URL:** \ **Category:** Ruby\ **Created:** [November 13, 2007, 5:30pm UTC](https://www.ruby-forum.com/t/rrdtool-gem/120088 "2007-11-13T17:30:18Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![haleythrapp](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/48db29/32.png) [@haleythrapp](https://www.ruby-forum.com/u/haleythrapp)\ **Post date:** [November 13, 2007, 5:30pm UTC](https://www.ruby-forum.com/t/rrdtool-gem/120088/1 "2007-11-13T17:30:18Z")
I am trying to use RRDtool through ruby. I have installed rrdtool and it appears to be working(I can run the sample scripts). I downloaded the RubyRRDtool gem and tried to install it. The install appears to work without errors. I then tried running the example scripts for the rrdtool gem and just requiring the gem in irb. I get the same error for both, shown below (1). I then tried building the gem using the instructions in the README. I did a ‘ruby extconf.rb’, ‘make’, and ‘make install’. Make produces the warnings below (2), but no errors. The install also seems to succeed, but I get the same issue as the straight gem install. From my investigation so far, it appears that there are a number of rrd commands that are not defined in RRDtool.so. Is it possible the gem build is not linking against rrd correctly, and if so, how might I fix this? I have attached the Makefile that is produced from the extconf.rb. (1) irb(main):001:0\> require “RRDtool” LoadError: /usr/lib/ruby/gems/1.8/gems/RubyRRDtool-0.6.0/test/RRDtool.so: undefined symbol: rrd\_resize - /usr/lib/ruby/gems/1.8/gems/RubyRRDtool-0.6.0/test/RRDtool.so from /usr/lib/ruby/gems/1.8/gems/RubyRRDtool-0.6.0/test/RRDtool.so from /usr/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:32:in `require’ from (irb):1 (2) i386-redhat-linux-gcc -I. -I. -I/usr/lib/ruby/1.8/i386-linux -I. -fPIC -O2 -g -pipe -Wall -Wp,-D\_FORTIFY\_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables -Wall -fPIC -c rubyrrdtool.c rubyrrdtool.c: In function \u2018rrdtool\_create\u2019: rubyrrdtool.c:317: warning: passing argument 5 of \u2018rrd\_create\_r\u2019 from incompatible pointer type rubyrrdtool.c: In function \u2018rrdtool\_update\u2019: rubyrrdtool.c:590: warning: passing argument 4 of \u2018rrd\_update\_r\u2019 from incompatible pointer type i386-redhat-linux-gcc -shared -L"/usr/lib" -o RRDtool.so rubyrrdtool.o -lruby -lart\_lgpl\_2 -lfreetype -lpng -lz -lpthread -ldl -lcrypt -lm -lc ---
**Author:** ![haleythrapp](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/48db29/32.png) [@haleythrapp](https://www.ruby-forum.com/u/haleythrapp)\ **Post date:** [November 13, 2007, 7:29pm UTC](https://www.ruby-forum.com/t/rrdtool-gem/120088/2 "2007-11-13T19:29:47Z")
Haley T. wrote: > there are a number of rrd commands that are not defined in RRDtool.so. > /usr/lib/ruby/gems/1.8/gems/RubyRRDtool-0.6.0/test/RRDtool.so: undefined > (2) > \u2018rrd\_update\_r\u2019 from incompatible pointer type > i386-redhat-linux-gcc -shared -L"/usr/lib" -o RRDtool.so rubyrrdtool.o > -lruby -lart\_lgpl\_2 -lfreetype -lpng -lz -lpthread -ldl -lcrypt -lm > -lc > > Attachments: > [http://www.ruby-forum.com/attachment/965/Makefile](http://www.ruby-forum.com/attachment/965/Makefile) The “-lrrd” seems to be missing from your Makefile (and hence from the link step above). Mine looks like this: LIBS = -lrrd -lart\_lgpl\_2 -lfreetype -lpng -lz -lpthread -ldl -lcrypt -lm -lc Can you show your mkmf.log? ---
**Author:** ![haleythrapp](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/48db29/32.png) [@haleythrapp](https://www.ruby-forum.com/u/haleythrapp)\ **Post date:** [November 13, 2007, 8:02pm UTC](https://www.ruby-forum.com/t/rrdtool-gem/120088/3 "2007-11-13T20:02:36Z")
Joel VanderWerf wrote: > Haley T. wrote: > > > there are a number of rrd commands that are not defined in RRDtool.so. > > /usr/lib/ruby/gems/1.8/gems/RubyRRDtool-0.6.0/test/RRDtool.so: undefined > > (2) > > \u2018rrd\_update\_r\u2019 from incompatible pointer type > > i386-redhat-linux-gcc -shared -L"/usr/lib" -o RRDtool.so rubyrrdtool.o > > -lruby -lart\_lgpl\_2 -lfreetype -lpng -lz -lpthread -ldl -lcrypt -lm > > -lc > > > > Attachments: > > [http://www.ruby-forum.com/attachment/965/Makefile](http://www.ruby-forum.com/attachment/965/Makefile) > > The “-lrrd” seems to be missing from your Makefile (and hence from the > link step above). > > Mine looks like this: > > LIBS = -lrrd -lart\_lgpl\_2 -lfreetype -lpng -lz -lpthread -ldl -lcrypt > -lm -lc > > Can you show your mkmf.log? Thanks, it was the -lrrd that was missing. I had to move the .so files so that they could be found correctly, but it appears to be working now. Haley ---
**Author:** ![haleythrapp](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/48db29/32.png) [@haleythrapp](https://www.ruby-forum.com/u/haleythrapp)\ **Post date:** [November 14, 2007, 4:17am UTC](https://www.ruby-forum.com/t/rrdtool-gem/120088/4 "2007-11-14T04:17:12Z")
Haley T. wrote: > there are a number of rrd commands that are not defined in RRDtool.so. > /usr/lib/ruby/gems/1.8/gems/RubyRRDtool-0.6.0/test/RRDtool.so: undefined > (2) > \u2018rrd\_update\_r\u2019 from incompatible pointer type > i386-redhat-linux-gcc -shared -L"/usr/lib" -o RRDtool.so rubyrrdtool.o > -lruby -lart\_lgpl\_2 -lfreetype -lpng -lz -lpthread -ldl -lcrypt -lm > -lc > > Attachments: > [http://www.ruby-forum.com/attachment/965/Makefile](http://www.ruby-forum.com/attachment/965/Makefile) I think the most recent version of RRDTool source comes bundled with a working Ruby binding, which you need to enable when you configure RRDTool. I ran into some conflicts between RRDTool and the Ruby binding package in Gentoo, and they went away when I compiled RRDTool with the Ruby bindings bundled with it. See [180144 – confusion over RRDtool Ruby bindings; possible need for a blocker between rrdtool and ruby-rrd](http://bugs.gentoo.org/show_bug.cgi?id=180144) and [97403 – ruby-rrd ebuild doesn't build against rrdtool-1.2.6, the latest stable](http://bugs.gentoo.org/show_bug.cgi?id=97403) If you’re not building RRDTool from source, you’ll probably need to go hassle your distro’s bug tracker (unless you’re using Gentoo, in which case it just works.)