In Fedora and EL8 distros, the suggested packages to install is effective and correct:
yum install libmicrohttpd-devel jansson-devel \
openssl-devel libsrtp-devel sofia-sip-devel glib2-devel \
opus-devel libogg-devel libcurl-devel pkgconfig \
libconfig-devel libtool autoconf automake
However, on EL9 distros (testing on CentOS Stream 9 and Almalinux 9), many of these -devel packages (specifically jansson-devel libsrtp-devel opus-devel libogg-devel libconfig-devel) don’t exist! Neither in EPEL or rpmfusion.
Does anybody know what’s going on here? It’s surely not an issue with janus itself, but I wonder if anybody has run into this and has a solution.