fix build for other systems like - lchat - A line oriented chat front end for ii.
 (HTM) git clone git://git.suckless.org/lchat
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       ---
 (DIR) commit 46b720fa3c8b3be05294b9d2baf69a2f1c8cc20d
 (DIR) parent 8021e906ef9fffb74f35409782ce41100bf0efb7
 (HTM) Author: Jan Klemkow <j.klemkow@wemelug.de>
       Date:   Sun, 27 Dec 2015 23:45:06 +0100
       
       fix build for other systems like
       
       Diffstat:
         M Makefile                            |       3 ++-
         M lchat.1                             |       2 +-
         M lchat.c                             |       4 ++++
       
       3 files changed, 7 insertions(+), 2 deletions(-)
       ---
 (DIR) diff --git a/Makefile b/Makefile
       @@ -11,7 +11,8 @@ lchat: lchat.o slackline.o
                $(CC) -o $@ lchat.o slackline.o -ltermlib
        
        lchat.o: lchat.c
       -        $(CC) -c $(CFLAGS) -o $@ lchat.c
       +        $(CC) -c $(CFLAGS) -D_BSD_SOURCE -D_XOPEN_SOURCE -D_GNU_SOURCE \
       +            -o $@ lchat.c
        
        slackline.o: slackline.c slackline.h
                $(CC) -c $(CFLAGS) -o $@ slackline.c
 (DIR) diff --git a/lchat.1 b/lchat.1
       @@ -29,7 +29,7 @@ and
        files inside of the
        .Ar directory
        path.
       -
       +.sp 1
        The options are as follows:
        .Bl -tag -width Ds
        .It Fl a
 (DIR) diff --git a/lchat.c b/lchat.c
       @@ -30,6 +30,10 @@
        
        #include "slackline.h"
        
       +#ifndef INFTIM
       +#define INFTIM -1
       +#endif
       +
        struct termios origin_term;
        struct winsize winsize;