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sem_init(3) is part of libc on FreeBSD, so we ended up not linking against
libpthread. Look for a symbol that causes us to load it.
--- configure.ac.orig   2019-03-26 21:58:42 UTC
+++ configure.ac
@@ -375,6 +375,7 @@ CXXFLAGS="$OLD_CXXFLAGS"
 # ----------------------------------------
 
 AC_SEARCH_LIBS([sem_init], [pthread rt])
+AC_SEARCH_LIBS([pthread_create], [pthread])
 
 
 # ----------------------------------------