diff --git a/configure.ac b/configure.ac
index f11b345cf6..9f964a2f3e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -453,6 +453,7 @@ fi
 AC_C_FLAG([-Wno-unused-parameter])
 AC_C_FLAG([-Wno-missing-field-initializers])
 AC_C_FLAG([-Wno-microsoft-anon-tag])
+AC_C_FLAG([-Wno-error=deprecated-declarations])
 
 AC_C_FLAG([-Wc++-compat], [], [CXX_COMPAT_CFLAGS="-Wc++-compat"])
 AC_SUBST([CXX_COMPAT_CFLAGS])