Move feature test macros into configure.in -> CFLAGS so we don't

end up with mismatch between "configure" and compile time

Makefile

@@ -52,13 +52,13 @@ acconfig.h: MCONFIG
 	: Generated by side effect
 
 acconfig.h.in: configure.in aclocal.m4
+	rm -f acconfig.h.in acconfig.h
 	autoheader -f
-	touch -c acconfig.h.in
-	rm -f acconfig.h
 
 configure: configure.in aclocal.m4
+	rm -f MCONFIG configure config.log acconfig.h
+	rm -rf *.cache
 	autoconf
-	rm -f MCONFIG config.cache config.log acconfig.h
 
 version.h: version
 	echo \#define VERSION \"tftp-hpa `cat version`\" > version.h

config.h

@@ -21,15 +21,6 @@
 /* Must be included before we include any system headers! */
 #include "acconfig.h"
 
-/* This is necessary on Solaris with gcc */
-#define _XPG4_2
-#define _XOPEN_SOURCE
-#define __EXTENSIONS__
-
-/* This is necessary on glibc systems */
-#define _BSD_SOURCE
-#define _ISO9X_SOURCE
-
 /* Standard includes */
 
 #include <stdio.h>
@@ -181,8 +172,12 @@ typedef unsigned long u_long;
 #endif
 #endif
 
-/* arpa/tftp.h, and possible missing pieces */
+/* arpa/{inet,tftp}.h, and possible missing pieces */
 
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+/* If we don't have arpa/tftp.h we have problems... */
 #include <arpa/tftp.h>
 
 #ifndef OACK

configure.in

@@ -11,6 +11,22 @@ AC_ISC_POSIX
 AC_AIX
 AC_MINIX
 AC_PROG_CC
+
+dnl
+dnl Feature-test macros.  These need to be set in CFLAGS, rather in
+dnl acconfig.h, or "configure" will run in a different environment than
+dnl we eventually we build in.
+dnl
+
+dnl Needed on Solaris/cc or Solaris/gcc
+CFLAGS="$CFLAGS -D_XPG4_2"
+CFLAGS="$CFLAGS -D_XOPEN_SOURCE"
+CFLAGS="$CFLAGS -D__EXTENSIONS__"
+
+dnl Needed on some glibc systems
+CFLAGS="$CFLAGS -D_BSD_SOURCE"
+CFLAGS="$CFLAGS -D_ISO9X_SOURCE"
+
 AC_C_CONST
 AC_C_INLINE
 
@@ -46,6 +62,7 @@ AC_CHECK_HEADERS(unistd.h)
 AC_CHECK_HEADERS(sys/filio.h)
 AC_CHECK_HEADERS(sys/stat.h)
 AC_CHECK_HEADERS(sys/types.h)
+AC_CHECK_HEADERS(arpa/inet.h)
 dnl This is needed on some versions of FreeBSD...
 AC_CHECK_HEADERS(machine/param.h)
 
@@ -55,6 +72,7 @@ AC_CHECK_TYPES(uint16_t)
 AC_CHECK_TYPES(uint32_t)
 AC_CHECK_TYPES(u_short)
 AC_CHECK_TYPES(u_long)
+AC_TYPE_OFF_T
 AC_TYPE_PID_T
 
 AC_SEARCH_LIBS(socket, socket, , [AC_MSG_ERROR(socket library not found)])

tftpd/recvfrom.h

@@ -16,12 +16,7 @@
  *
  */
 
-#define _XPG4_2			/* Needed on Solaris */
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netinet/in.h>
-#include <arpa/inet.h>
-#include <stdlib.h>
+#include "config.h"
 
 int
 myrecvfrom(int s, void *buf, int len, unsigned int flags,