support for vde network
support for netmap network
Linux io_uring support

##########################################
# vde libraries probe
if test "$vde" != "no" ; then
  vde_libs="-lvdeplug"
  cat > $TMPC << EOF
#include <libvdeplug.h>
int main(void)
{
    struct vde_open_args a = {0, 0, 0};
    char s[] = "";
    vde_open(s, s, &a);
    return 0;
}
EOF
  if compile_prog "" "$vde_libs" ; then
    vde=yes
  else
    if test "$vde" = "yes" ; then
      feature_not_found "vde" "Install vde (Virtual Distributed Ethernet) devel"
    fi
    vde=no
  fi
fi

##########################################
# vmnet.framework probe
if test "$vmnet" != "no" ; then
  vmnet_flags="-framework vmnet"
  cat > $TMPC << EOF
#include <vmnet/vmnet.h>
int main(void)
{
    (void) vmnet_allocate_mac_address_key;
    return 0;
}
EOF
  if compile_prog "" "$vmnet_flags" ; then
    vmnet=yes
  else
    if test "$vmnet" = "yes" ; then
      feature_not_found "vmnet" "'vmnet.framework' in unsupported in this build"
    fi
    vmnet=no
  fi
fi

##########################################
# netmap support probe
# Apart from looking for netmap headers, we make sure that the host API version
# supports the netmap backend (>=11). The upper bound (15) is meant to simulate
# a minor/major version number. Minor new features will be marked with values up
# to 15, and if something happens that requires a change to the backend we will
# move above 15, submit the backend fixes and modify this two bounds.
if test "$netmap" != "no" ; then
  cat > $TMPC << EOF
#include <inttypes.h>
#include <net/if.h>
#include <net/netmap.h>
#include <net/netmap_user.h>
#if (NETMAP_API < 11) || (NETMAP_API > 15)
#error
#endif
int main(void) { return 0; }
EOF
  if compile_prog "" "" ; then
    netmap=yes
  else
    if test "$netmap" = "yes" ; then
      feature_not_found "netmap"
    fi
    netmap=no
  fi
fi

##########################################
# detect CoreAudio
if test "$coreaudio" != "no" ; then
  coreaudio_libs="-framework CoreAudio"
  cat > $TMPC << EOF
#include <CoreAudio/CoreAudio.h>
int main(void)
{
  return (int)AudioGetCurrentHostTime();
}
EOF
  if compile_prog "" "$coreaudio_libs" ; then
    coreaudio=yes
  else
    coreaudio=no
  fi
fi