configure: Correctly check for drillbit when testing if any mining is compiled in
diff --git a/configure.ac b/configure.ac
index a39bdbf..de7d5e7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -518,7 +518,7 @@ else
echo " ModMiner.FPGAs.......: Disabled"
fi
-if test "x$avalon$bab$bflsc$bitforce$bitfury$hashfast$icarus$klondike$knc$modminer" = xnononononononononono; then
+if test "x$avalon$bab$bflsc$bitforce$bitfury$hashfast$icarus$klondike$knc$modminer$drillbit" = xnonononononononononono; then
AC_MSG_ERROR([No mining configured in])
fi