diff --git a/configure.ac b/configure.ac
index 3a12a1a..a4474fa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -31,8 +31,16 @@ fi
 
 
 PKG_CONFIG_LIBS=
+ac_save_LIBS="$LIBS"
+case "$host" in
+*-*-freebsd*)
+	# pthread_condattr_{init,destroy} is provided from libthr
+	LIBS="-lthr"
+	;;
+esac
 AC_CHECK_FUNCS([pthread_self pthread_mutex_init pthread_mutex_destroy pthread_mutex_lock pthread_mutex_unlock pthread_cond_init pthread_cond_destroy pthread_condattr_init pthread_condattr_destroy pthread_cond_wait pthread_cond_timedwait pthread_cond_signal pthread_cond_broadcast pthread_equal pthread_exit],
 	       [], [PKG_CONFIG_LIBS='-L${libdir} -lpthread-stubs'])
+LIBS="$ac_save_LIBS"
 AC_SUBST([PKG_CONFIG_LIBS])
 AM_CONDITIONAL(BUILD_LIB, test "x$PKG_CONFIG_LIBS" != x)