diff --git a/BasiliskII/src/Unix/configure.ac b/BasiliskII/src/Unix/configure.ac
index 32fab8d0..4ceb6ac0 100644
--- a/BasiliskII/src/Unix/configure.ac
+++ b/BasiliskII/src/Unix/configure.ac
@@ -135,6 +135,7 @@ fi
 AC_CHECK_FUNCS(pthread_cancel)
 AC_CHECK_FUNCS(pthread_mutexattr_setprotocol)
 AC_CHECK_FUNCS(pthread_mutexattr_settype)
+AC_CHECK_FUNCS(pthread_mutexattr_setpshared)
 
 dnl If POSIX.4 semaphores are not available, we emulate them with pthread mutexes.
 SEMSRC=
diff --git a/BasiliskII/src/Unix/main_unix.cpp b/BasiliskII/src/Unix/main_unix.cpp
index 8bdbc4f8..4a637017 100644
--- a/BasiliskII/src/Unix/main_unix.cpp
+++ b/BasiliskII/src/Unix/main_unix.cpp
@@ -803,7 +803,9 @@ struct B2_mutex {
 #if defined(HAVE_PTHREAD_MUTEXATTR_SETTYPE) && defined(PTHREAD_MUTEX_NORMAL)
 	    pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_NORMAL);
 #endif
+#ifdef HAVE_PTHREAD_MUTEXATTR_SETPSHARED
 	    pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_PRIVATE);
+#endif
 	    pthread_mutex_init(&m, &attr);
 	    pthread_mutexattr_destroy(&attr);
 	}