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AC_MSG_CHECKING(if kppp's headers are installed)
# this is a little piece of code out of kppp. If it doesn't compile,
# kppp is not good for this system. It doesn't do anything, but enough
# to fail ;)
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
AC_TRY_LINK([
#if defined(__osf__) || defined(__svr4__)
#define _POSIX_PII_SOCKET
extern "C" int sethostname(char *name, int name_len);
#endif
#include <unistd.h>
#include <arpa/inet.h>
#ifdef __DragonFly__
#include <net/ppp_layer/ppp_defs.h>
#else
#include <net/ppp_defs.h>
#endif
#include <netinet/in.h>
#ifdef __svr4__
#include <sys/stropts.h>
#include <net/pppio.h> /* SVR4, Solaris 2, etc. */
#else
#include <sys/time.h>
#include <sys/socket.h>
#include <net/if.h>
#ifndef STREAMS
#if defined(linux)
#ifndef aligned_u64
#define aligned_u64 unsigned long long __attribute__((aligned(8)))
#endif
#include <linux/if_ppp.h>
#elif defined(__DragonFly__)
#include <net/ppp/if_ppp.h>
#else
#include <net/if_ppp.h> /* BSD, NeXT, etc. */
#endif
#else /* SunOS 4, AIX 4, OSF/1, etc. */
#include <sys/stream.h>
#include <net/ppp_str.h>
#endif
#endif
],[
sethostname("", 1); /* never run this program! :*/
],
[ AC_MSG_RESULT(yes) ],
[ DO_NOT_COMPILE="$DO_NOT_COMPILE kppp"
AC_MSG_RESULT(no)
])
AC_LANG_RESTORE
AC_CHECK_HEADERS(sys/param.h string.h)
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