growfiles: fix static build which needs to link the pthread library: Signed-off-by: nobuhiro <nobuhiro@andestech.com>.
diff --git a/testcases/kernel/fs/doio/Makefile b/testcases/kernel/fs/doio/Makefile
index 4e0cd24..6e8f2de 100644
--- a/testcases/kernel/fs/doio/Makefile
+++ b/testcases/kernel/fs/doio/Makefile
@@ -1,6 +1,6 @@
 
 CFLAGS+= -Wall -I../../../../include -D_LARGEFILE64_SOURCE
-LDLIBS+= -L../../../../lib -lltp -lrt
+LDLIBS+= -L../../../../lib -lltp -lrt -lpthread
 
 TARGETS=doio growfiles rwtest iogen
 SRCS=$(wildcard *.c)