diff --git a/config.hh.in b/config.hh.in
index 4306bb11a1519e7b3b76c9e154dec9476b2f5f8b..698955ba6b6e5c680e119f5493f21d181fabf49d 100644
--- a/config.hh.in
+++ b/config.hh.in
@@ -35,12 +35,6 @@
 /* define if you have some kind of windows platform */
 #define PLATFORM_WINDOWS 0
 
-/* define if you have assert.h */
-#define HAVE_ASSERT_H 0
-
-/* define if you have libio.h */
-#define HAVE_LIBIO_H 0
-
 /* define if you have sys/stat.h */
 #define HAVE_SYS_STAT_H 0
 
diff --git a/configure.ac b/configure.ac
index 9cf5eab080cb37400bbd13a9d6b44a963bbb3b65..358b5b89053deac74b040f023af461ce1204e887 100644
--- a/configure.ac
+++ b/configure.ac
@@ -295,7 +295,7 @@ STEPMAKE_PATH_PROG(FONTFORGE, fontforge, REQUIRED, 20110222)
 
 STEPMAKE_PATH_PROG(T1ASM, t1asm, REQUIRED)
 
-AC_CHECK_HEADERS([assert.h grp.h libio.h pwd.h sys/stat.h wchar.h])
+AC_CHECK_HEADERS([grp.h pwd.h sys/stat.h])
 AC_HEADER_STAT
 AC_FUNC_MEMCMP
 AC_FUNC_VPRINTF