-dnl Check for directory with kernel source... (from ALSA)
-AC_CACHE_CHECK([for directory with kernel source], tinc_cv_kerneldir,
-[ AC_ARG_WITH(kernel,
- [ --with-kernel=dir give the directory with kernel sources]
- [ (default: /usr/src/linux)],
- kerneldir="$withval", kerneldir="/usr/src/linux")
- AC_DEFINE_UNQUOTED(CONFIG_TINC_KERNELDIR, "$kerneldir")
- CONFIG_TINC_KERNELDIR="$kerneldir"
- AC_SUBST(CONFIG_TINC_KERNELDIR)
- AC_MSG_RESULT($kerneldir)
-])
-AC_CACHE_CHECK([for linux/if_tun.h], tinc_cv_linux_if_tun_h,
-[ AC_TRY_COMPILE([#include <linux/if_tun.h>],
- [int a = IFF_TAP],
- if_tun_h="linux/if_tun.h",
- if_tun_h="no")
- if test $if_tun_h = no; then
+ AC_ARG_WITH(kernel,
+ AC_HELP_STRING([--with-kernel=DIR], [give the directory with kernel sources (default: /usr/src/linux)]),
+ kerneldir="$withval",
+ kerneldir="/usr/src/linux"
+ )
+
+ AC_CACHE_CHECK([for linux/if_tun.h], tinc_cv_linux_if_tun_h,
+ [