The current build of kamailio (master) does not set `TLS_PTHREAD_MUTEX_SHARED`
when building with `--with-openssl11` on systems with multiple versions of
OpenSSL installed resulting in deadlocks in the TLS module.
All module Makefiles look for the `SSL_BUILDER` environment variable to provide
a `pkg-config` command to find the `libssl` to link against. The variable is
set to `pkg-config libssl11` by the RPM build when specifying
`--with-openssl11`. Unfortunately, in `src/Makefile.defs`, there is an
alternative way to look for a similar `pkg-config` command. However, this one
always uses the `pkg-config libssl`, which - on systems with multiple versions
of OpenSSL - usually points to OpenSSL 1.0.x. In turn the build thinks it will
link against OpenSSL 1.0.x and will not set `KSR_PTHREAD_MUTEX_SHARED`.
--
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https://github.com/kamailio/kamailio/issues/3458
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