make: conditionally link to libsqlite3.
diff --git a/configure b/configure
index c5373db..20815a4 100755
--- a/configure
+++ b/configure
@@ -16479,6 +16479,7 @@
fi
+# Require libcrypto.
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for EVP_EncryptInit in -lcrypto" >&5
$as_echo_n "checking for EVP_EncryptInit in -lcrypto... " >&6; }
if ${ac_cv_lib_crypto_EVP_EncryptInit+:} false; then :
@@ -16529,6 +16530,52 @@
See \`config.log' for more details" "$LINENO" 5; }
fi
+# Silently check for libsqlite3.
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for sqlite3_open in -lsqlite3" >&5
+$as_echo_n "checking for sqlite3_open in -lsqlite3... " >&6; }
+if ${ac_cv_lib_sqlite3_sqlite3_open+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ ac_check_lib_save_LIBS=$LIBS
+LIBS="-lsqlite3 $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+
+/* Override any GCC internal prototype to avoid an error.
+ Use char because int might match the return type of a GCC
+ builtin and then its argument prototype would still apply. */
+#ifdef __cplusplus
+extern "C"
+#endif
+char sqlite3_open ();
+int
+main ()
+{
+return sqlite3_open ();
+ ;
+ return 0;
+}
+_ACEOF
+if ac_fn_cxx_try_link "$LINENO"; then :
+ ac_cv_lib_sqlite3_sqlite3_open=yes
+else
+ ac_cv_lib_sqlite3_sqlite3_open=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+ conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_sqlite3_sqlite3_open" >&5
+$as_echo "$ac_cv_lib_sqlite3_sqlite3_open" >&6; }
+if test "x$ac_cv_lib_sqlite3_sqlite3_open" = xyes; then :
+ cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSQLITE3 1
+_ACEOF
+
+ LIBS="-lsqlite3 $LIBS"
+
+fi
+
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for std::shared_ptr" >&5
$as_echo_n "checking for std::shared_ptr... " >&6; }