Fix a compiling warning

This patch fixes the following warning of libcgroup-0.33.

$ make
flex lex.l
byacc -v -d parse.y
byacc: 2 shift/reduce conflicts
cc -g -O2 -I. -shared -fPIC -Wl,--soname,libcgroup.so.1 -o libcgroup.so \
        -Wl,--version-script,libcgroup.map,--allow-shlib-undefined \
        api.c wrapper.c lex.yy.c y.tab.c config.c
lex.l: In function 'yylex':
lex.l:30: warning: incompatible implicit declaration of built-in function 'strdup'
[snip]
$

Signed-off-by: Ken'ichi Ohmichi <oomichi@mxs.nes.nec.co.jp>
Signed-off-by: Dhaval Giani <dhaval@linux.vnet.ibm.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/lex.l b/lex.l
index f9cc1ae..48a53b4 100644
--- a/lex.l
+++ b/lex.l
@@ -12,6 +12,7 @@
  */
 
 %{
+#include <string.h>
 #include "y.tab.h"
 int line_no = 1;