gfio: add gerror.c for reporting errors

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/Makefile b/Makefile
index 4b87ca6..2b20a29 100644
--- a/Makefile
+++ b/Makefile
@@ -69,7 +69,7 @@
 
 OBJS = $(SOURCE:.c=.o)
 FIO_OBJS = $(OBJS) fio.o
-GFIO_OBJS = $(OBJS) gfio.o graph.o tickmarks.o ghelpers.o goptions.o
+GFIO_OBJS = $(OBJS) gfio.o graph.o tickmarks.o ghelpers.o goptions.o gerror.o
 
 T_SMALLOC_OBJS = t/stest.o
 T_SMALLOC_OBJS += mutex.o smalloc.o t/log.o
@@ -110,6 +110,9 @@
 ghelpers.o: ghelpers.c ghelpers.h
 	$(QUIET_CC)$(CC) $(CFLAGS) $(GTK_CFLAGS) $(CPPFLAGS) -c ghelpers.c
 
+gerror.o: gerror.c gerror.h
+	$(QUIET_CC)$(CC) $(CFLAGS) $(GTK_CFLAGS) $(CPPFLAGS) -c gerror.c
+
 gfio.o: gfio.c ghelpers.c
 	$(QUIET_CC)$(CC) $(CFLAGS) $(GTK_CFLAGS) $(CPPFLAGS) -c gfio.c