Index: b/configure.ac
===================================================================
--- a/configure.ac
+++ b/configure.ac
@@ -5,11 +5,11 @@ AM_INIT_AUTOMAKE([gnu dist-bzip2 -Wall])
 dnl Make builds less verbose.  Shuts off Makefile portability checks.
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
 dnl Note: config.h is not used in the current build
 dnl We leave this in place only to suppress an error message at autogen time
-AM_CONFIG_HEADER(config.h)
+AC_CONFIG_HEADERS(config.h)
 AC_CONFIG_MACRO_DIR([m4])
 
 dnl Checks for programs.
 AC_PROG_CC_STDC
 AC_USE_SYSTEM_EXTENSIONS