https://bugs.gentoo.org/806354
--- a/configure.ac
+++ b/configure.ac
@@ -104,13 +104,6 @@ dnl ------------------------------------
 dnl Checks for header files
 dnl --------------------------------------
 dnl
-AC_HEADER_STDC
-if test $ac_cv_header_stdc = yes; then
- AC_MSG_RESULT(Ok! I have just found them.)
-else
-  AC_MSG_ERROR(Cannot find ANSI C header files!)
-fi
-
 AC_HEADER_STDBOOL
 AC_CHECK_HEADERS(fcntl.h locale.h stddef.h \
   stdlib.h string.h sys/file.h time.h unistd.h wchar.h wctype.h)