diff --git a/configure.ac b/configure.ac
index e69edf8bb..b1aeb1276 100644
--- a/configure.ac
+++ b/configure.ac
@@ -657,9 +657,6 @@ AC_HEADER_STDBOOL
 AC_TYPE_SIZE_T
 
 # Checks for library functions.
-AC_FUNC_ALLOCA
-AC_FUNC_MALLOC
-AC_FUNC_REALLOC
 AC_FUNC_CLOSEDIR_VOID
 AC_FUNC_SELECT_ARGTYPES
 AC_FUNC_SETVBUF_REVERSED