--- configure.ac.orig	2022-12-29 08:45:02.000000000 +0700
+++ configure.ac	2022-12-29 08:45:44.000000000 +0700
@@ -58,8 +58,9 @@
 AC_STRUCT_TM
 
 # Checks for library functions.
-AC_FUNC_MALLOC
-AC_FUNC_REALLOC
+# These two cause a failure with Clang, comment out:
+# AC_FUNC_MALLOC
+# AC_FUNC_REALLOC
 AC_CHECK_FUNCS([floor modf pow sqrt strchr erfc nextafter])
 
 # Output files