[PATCH] Don't hardcode ioengine path

Use the prefix in the Makefile, so it can be packaged properly.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/ioengines.c b/ioengines.c
index 1790963..82b7ec3 100644
--- a/ioengines.c
+++ b/ioengines.c
@@ -31,7 +31,7 @@
 	if (!strncmp(engine, "linuxaio", 8) || !strncmp(engine, "aio", 3))
 		strcpy(engine, "libaio");
 
-	sprintf(engine_lib, "/usr/local/lib/fio/fio-engine-%s.o", engine);
+	sprintf(engine_lib, "%s/lib/fio/fio-engine-%s.o", fio_inst_prefix, engine);
 	dlerror();
 	dlhandle = dlopen(engine_lib, RTLD_LAZY);
 	if (!dlhandle) {