All, I'm trying to build from source using the instructions here: https://freeswitch.org/confluence/display/FREESWITCH/CentOS+7+and+RHEL+7 I am almost there but continuously fail to build mod_av with the following error: make[4]: Entering directory `/usr/local/src/freeswitch/src/mod/applications/mod_av' Makefile:1382: *** You must install libavformat-dev to build mod_av. Stop. I've tried building libav from scratch from their github repository and still see the same error. Has anyone else had success with this? Larry -- *Your privacy is important to us. That is why we have taken appropriate measures to ensure the data you provide to us is kept secure. To learn more about how we process your personal information, how we comply with applicable data protection laws, and care for the security and privacy of your personal data, please review our Privacy Policy. If you have any questions related to data protection and compliance with applicable laws, please contact us at our Security Operations Center at 1-800-674-4357 or mail us at: Attention: Privacy Compliance Program, P.O. Box 59263, Schaumburg, IL USA, 60159-0263*