-AC_OUTPUT([Makefile src/Makefile cipher/Makefile cipher/blowfish/Makefile
-doc/Makefile lib/Makefile m4/Makefile redhat/Makefile debian/Makefile])
+
+dnl Crypto stuff
+
+libcrypto=none
+AC_CHECK_LIB(crypto, SHA1_version, [
+ libcrypto=yes
+])
+
+if test $libcrypto = none; then
+ AC_MSG_ERROR(It seems like OpenSSL is not installed on this system.)
+else
+ LIBS="$LIBS -lcrypto"
+fi
+
+
+dnl Check for TUN/TAP support in the kernel
+tinc_TUNTAP
+
+AC_OUTPUT([Makefile src/Makefile
+doc/Makefile doc/es/Makefile intl/Makefile lib/Makefile
+m4/Makefile po/Makefile.in redhat/Makefile debian/Makefile])