--- lemon.c.orig	2006-07-20 01:09:51.000000000 -0500
+++ lemon.c	2020-11-13 15:11:19.000000000 -0600
@@ -11,6 +11,7 @@
 #include <string.h>
 #include <ctype.h>
 #include <stdlib.h>
+#include <unistd.h>
 
 #ifndef __WIN32__
 #   if defined(_WIN32) || defined(WIN32)
@@ -2994,7 +2995,7 @@
 PRIVATE FILE *tplt_open(lemp)
 struct lemon *lemp;
 {
-  static char templatename[] = "lempar.c";
+  static char templatename[] = LEMPAR;
   char buf[1000];
   FILE *in;
   char *tpltname;
@@ -3466,7 +3467,7 @@
 
   in = tplt_open(lemp);
   if( in==0 ) return;
-  out = file_open(lemp,".c","wb");
+  out = file_open(lemp,CSUFFIX,"wb");
   if( out==0 ){
     fclose(in);
     return;
@@ -3877,7 +3878,7 @@
 
   if( lemp->tokenprefix ) prefix = lemp->tokenprefix;
   else                    prefix = "";
-  in = file_open(lemp,".h","rb");
+  in = file_open(lemp,HSUFFIX,"rb");
   if( in ){
     for(i=1; i<lemp->nterminal && fgets(line,LINESIZE,in); i++){
       sprintf(pattern,"#define %s%-30s %2d\n",prefix,lemp->symbols[i]->name,i);
@@ -3889,7 +3890,7 @@
       return;
     }
   }
-  out = file_open(lemp,".h","wb");
+  out = file_open(lemp,HSUFFIX,"wb");
   if( out ){
     for(i=1; i<lemp->nterminal; i++){
       fprintf(out,"#define %s%-30s %2d\n",prefix,lemp->symbols[i]->name,i);