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diff --git a/Makefile b/Makefile
index 5386821..eb5db3e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
-CC = gcc
-CFLAGS = -g -O2 -MMD
+CC ?= gcc
+CFLAGS += -MMD
OBJS = \
hcalc.o \
@@ -10,7 +10,7 @@ OBJS = \
$E
hcalc : $(OBJS)
- gcc -o $@ $^ -L/usr/X11R6/lib -lXpm -lX11
+ $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ -lXpm -lX11
clean :
-rm -f *.o *.d *~ \#* hcalc core
diff --git a/draw.c b/draw.c
index 5bde83d..c3bdeb2 100644
--- a/draw.c
+++ b/draw.c
@@ -3,6 +3,7 @@
http://www.delorie.com/store/hcalc/
*/
#include "hcalc.h"
+#include <string.h>
static char shown_offsets[15];
static int shown_bitmask;
diff --git a/input.c b/input.c
index d7de47c..f1d45f5 100644
--- a/input.c
+++ b/input.c
@@ -5,6 +5,7 @@
#include "hcalc.h"
#include <ctype.h>
#include <string.h>
+#include <stdlib.h>
char pending_op = 0;
int making_number = 0;
diff --git a/setupx.c b/setupx.c
index 238c1e2..74e574b 100644
--- a/setupx.c
+++ b/setupx.c
@@ -3,6 +3,7 @@
http://www.delorie.com/store/hcalc/
*/
#include "hcalc.h"
+#include <stdlib.h>
Display *display=0;
int screen=0;
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