diff --git a/package/gob2/gob2.mk b/package/gob2/gob2.mk
index 5d50ed6cb6..04b3798f79 100644
--- a/package/gob2/gob2.mk
+++ b/package/gob2/gob2.mk
@@ -6,6 +6,7 @@
 GOB2_VERSION = 2.0.15
 GOB2_SOURCE = gob2-$(GOB2_VERSION).tar.gz
 GOB2_SITE = http://ftp.5z.com/pub/gob/
+IPERF_CONF_ENV = ac_cv_lib_lex=-lfl
 
 GOB2_DEPENDENCIES = libglib2 flex bison host-pkg-config host-flex