diff --git a/Makefile b/Makefile
index e8d37e0..8d3be3a 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ TARS=Makefile main.c points.c readfont.c xwin.c label.c clip.c points.h \
 symbol.c symbol.h xwin.h readfont.h eventnames.h postscript.c stipple.c \
 postscript.h ${FONTS} pd pd.1 README
 
-CC=cc -ggdb -Wall
+CC=cc -ggdb -Wall -Werror
 #CC=cc -pg -Wall
 
 BINDIR = /usr/local/bin
diff --git a/main.c b/main.c
index 92cd301..5f9864c 100644
--- a/main.c
+++ b/main.c
@@ -1,12 +1,18 @@
+#ifndef _DEFAULT_SOURCE
+#define _DEFAULT_SOURCE
+#endif
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <ctype.h>
 #include <string.h>
 #include <math.h>
+#include <unistd.h>
+#include <getopt.h>
+
 #include "points.h"
 #include "xwin.h"
 #include "readfont.h"
-#include <unistd.h>
 #include "symbol.h"
 #include "postscript.h"
 
@@ -27,16 +33,13 @@ int getz(char *s, int n) {
 // return a pointer to the first 
 // non-blank character in s
 char *skipblanks(char *s) {
-   while (isblank(*s) && *s!='\0') {
+   while (isblank(*s) && (*s != '\0')) {
       s++;
    }
-   return(s);
+   return s;
 }
 
-int main(argc,argv)
-int argc;
-char **argv;
-{
+int main(int argc, char *argv[]) {
     int n;
     double x,y;
     char s[BUF_SIZE];
@@ -44,12 +47,12 @@ char **argv;
     char scratch2[BUF_SIZE*2];
     char *sp;
     int line=0;
-    progname = argv[0];
     double xmin,xmax,ymin,ymax;
     double tmp;
     int itmp;
     int opt;
 
+    progname = argv[0];
     setvbuf(stdin, NULL, _IONBF, 0);  // make stdin unbuffered 
 
     while ((opt=getopt(argc, argv, "D:")) != -1) {
@@ -61,7 +64,7 @@ char **argv;
 	    // com_ci(optarg); // open rawfile 
 	    // break;
 	default:	/* '?' */
-	   fprintf(stderr, "usage: %s [-p <psfile>] [-g <pngfile>] [-r <rawfile>] <script>\n", argv[0]);
+	   fprintf(stderr, "usage: %s [-D display] <script>\n", argv[0]);
 	   exit(1);
 	}
     }
@@ -79,22 +82,25 @@ char **argv;
     initsym();
     initplot();
 
-    if (0 && access("./NOTEDATA.F", R_OK) == 0) {
+    if (access("./NOTEDATA.F", R_OK) == 0) {
 	loadfont("./NOTEDATA.F", 0);
     } else if (access("/usr/local/lib/pdplot/NOTEDATA.F", R_OK) == 0) {
 	loadfont("/usr/local/lib/pdplot/NOTEDATA.F", 0);
     } else {
         fprintf(stderr,"can't find NOTEDATA.F font file\n");
-	exit(0);
+	exit(2);
     }
 
-    if (0 && access("./SYMBOL.F", R_OK) == 0) {
+#ifdef DEBUG
+    if (access("./SYMBOL.F", R_OK) == 0) {
 	loadfont("./SYMBOL.F", 1);
-    } else if (access("/usr/local/lib/pdplot/SYMBOL.F", R_OK) == 0) {
+    } else
+#endif
+    if (access("/usr/local/lib/pdplot/SYMBOL.F", R_OK) == 0) {
 	loadfont("/usr/local/lib/pdplot/SYMBOL.F", 1);
     } else {
         fprintf(stderr,"can't find SYMBOL.F font file\n");
-	exit(0);
+	exit(3);
     }
 
   while (1) {
@@ -325,7 +331,7 @@ char **argv;
 		   xwin_dump_postscript("cat > pddump.dxf");
 	       }
 	   } else if (strncmp(sp,"exit",4)==0) {
-	       exit(2);
+	       exit(0);
 	   } else {
 	       savecmd(sp);
 	   }
@@ -345,5 +351,5 @@ char **argv;
     usleep(500); 	// don't hog CPU
     clearerr(stdin);	// recover from EOF on input pipe file
   }
-  exit(1);
+  exit(0);
 }
diff --git a/points.h b/points.h
index eaa20ee..a8584ca 100644
--- a/points.h
+++ b/points.h
@@ -1,3 +1,6 @@
+#ifndef __PDP_POINTS_H
+#define __PDP_POINTS_H
+
 typedef struct datum {
     char *cmd;		// either NULL or cmd string.  If str, then x,y unused.
     double x;
@@ -105,3 +108,4 @@ extern double xmin, xmax, ymin, ymax;
 #define MIRROR_Y   2
 #define MIRROR_XY  3
 
+#endif
diff --git a/stipple.c b/stipple.c
index dd82dac..a6f3299 100644
--- a/stipple.c
+++ b/stipple.c
@@ -1,11 +1,11 @@
+#include <stdlib.h>
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 #include <X11/Xos.h>
 #include <X11/Xatom.h>
-// #include "db.h"
+
 #include "points.h"
 #include "xwin.h"
-#include <stdlib.h>
 
 #define STIPW 8
 #define STIPH 8 
@@ -128,11 +128,10 @@ int get_stipple_index(int fill, int pen) {
 }
 
 char *get_stipple_bits(int i) {
-
    if (i >= MAXSTIP-1) {
       return NULL;
    } else {
-       return(&stip_src[i][0]);
+       return (&stip_src[i][0]);
    }
 }
 
diff --git a/xwin.c b/xwin.c
index 526e163..9a054bd 100644
--- a/xwin.c
+++ b/xwin.c
@@ -1,3 +1,7 @@
+#ifndef _POSIX_C_SOURCE
+#define _POSIX_C_SOURCE 2
+#endif
+
 #include <X11/Xlib.h>
 #include <X11/Xutil.h>
 #include <X11/Xos.h>
@@ -42,7 +46,7 @@ Display *dpy;
 int screen_num;
 
 int need_redraw=0;
-char *progname;
+extern char *progname;
 
 #define BUF_SIZE 2000
 
@@ -511,9 +515,9 @@ double x1,y1,x2,y2;
 
 void xwin_set_pen_line(int pen, int line) 
 {
-    int dash_n;
+    int dash_n = 2;
     int dash_offset;
-    int line_style;
+    int line_style = LineSolid;
     int line_width;
     char dash_list[5];
 
diff --git a/xwin.h b/xwin.h
index d16deb9..4451606 100644
--- a/xwin.h
+++ b/xwin.h
@@ -1,3 +1,4 @@
+#include "points.h"
 
 void initX(void);
 int procXevent(char *s, int n);