--- asterisk-16.15.1/configure.ac.o	2021-01-08 18:41:50.979913016 +0200
+++ asterisk-16.15.1/configure.ac	2021-01-08 18:42:23.739899786 +0200
@@ -612,11 +612,6 @@
   AC_MSG_ERROR([*** Could not find dirent header that defines 'DIR'.])
 fi
 
-AC_HEADER_STDC
-if test "$ac_cv_header_stdc" != "yes"; then
-  AC_MSG_ERROR([*** ANSI C header files not found.])
-fi
-
 AC_HEADER_SYS_WAIT
 if test "$ac_cv_header_sys_wait_h" != "yes"; then
   AC_MSG_ERROR([*** POSIX.1 compatible sys/wait.h is required.])