This change lets SoX compile with the newer opencore-amr libraries... which most distributions seem to be moving to (Fedora 12+rpmfusion moved to this). The main down side is opencore-amr does not support encoding of amr-wb format.
It should work with the older amr libraries as well... but I do not have those libraries lying around. If someone has those installed, I'd appreciate trying out CVS and verifying it does works for you.
Update of /cvsroot/sox/sox
In directory fdv4jf1.ch3.sourceforge.com:/tmp/cvs-serv2796
ChangeLog INSTALL configure.ac
Optional support for opencore-amr libraries.