diff --git a/compiler/cpp/configure.ac b/compiler/cpp/configure.ac
index ba08e2f..83b6bb0 100644
--- a/compiler/cpp/configure.ac
+++ b/compiler/cpp/configure.ac
@@ -22,6 +22,10 @@
 
 AC_CHECK_FUNCS([strerror])
 
+AC_STRUCT_TM
+
+AC_FUNC_STRFTIME
+
 AC_FUNC_MALLOC
 
 AC_FUNC_REALLOC