--- asterisk-13.38.1/configure.ac.o	2021-01-08 18:33:41.360112920 +0200
+++ asterisk-13.38.1/configure.ac	2021-01-08 18:38:26.649995123 +0200
@@ -605,7 +605,6 @@
 
 AC_FUNC_ALLOCA
 AC_HEADER_DIRENT
-AC_HEADER_STDC
 AC_HEADER_SYS_WAIT
 AC_CHECK_HEADERS([arpa/inet.h fcntl.h inttypes.h libintl.h limits.h locale.h malloc.h netdb.h netinet/in.h stddef.h stdint.h stdlib.h string.h strings.h sys/event.h sys/file.h sys/ioctl.h sys/param.h sys/socket.h sys/time.h sys/types.h syslog.h termios.h unistd.h utime.h arpa/nameser.h sys/io.h])