[Freeswitch-users] Ruby ESL missing pthread

I followed the instructions on the wiki to compile the Ruby version of ESL, but then when I tried to run the examples, I kept getting a "undefined symbol: pthread_mutexattr_init" error. I ran ldd on the ESL.so file in the libs/esl/ruby folder and found it wasn't linked against pthread, so I manually added -lpthread to the Makefile, recompiled and got it to work. The only other version I tried was the Perl one and it compiled and worked without needing anything.