--- build/configure.ac.system.orig	2020-11-26 23:20:59 UTC
+++ build/configure.ac.system
@@ -53,11 +53,11 @@ LIBS="$LIBS $LIBM"
 AC_CHECK_LIBM
 LIBS="$LIBS $LIBM"
 
-AC_CHECK_LIB(rt, sched_yield)
+AC_CHECK_LIB(c, sched_yield)
 
 has_shm_open=
-AC_CHECK_LIB(rt, shm_open, [
-	     SHM_LIBS=-lrt
+AC_CHECK_LIB(c, shm_open, [
+	     SHM_LIBS=
 	     has_shm_open=yes
 	     ], [SHM_LIBS=])
 AM_CONDITIONAL(HAVE_SHM, test "x$has_shm_open" = "xyes")