diff -NurbB mscgen.ori/src/parser/language.l mscgen/src/parser/language.l
--- mscgen.ori/src/parser/language.l	2008-02-02 23:48:21.000000000 +0100
+++ mscgen/src/parser/language.l	2008-02-02 23:54:58.000000000 +0100
@@ -30,8 +30,13 @@
 /* Counter for error reporting */
 static unsigned long lex_linenum = 1;
 
+extern char *strdup(const char *s1);
+extern int fileno(FILE *stream);
+
 %}
 
+%option nounput
+
 %%
 
 \n            lex_linenum++;
diff -NurbB mscgen.ori/src/renderer/gd_out.c mscgen/src/renderer/gd_out.c
--- mscgen.ori/src/renderer/gd_out.c	2008-02-02 23:48:21.000000000 +0100
+++ mscgen/src/renderer/gd_out.c	2008-02-02 23:54:58.000000000 +0100
@@ -143,7 +143,7 @@
                   getGdoCtx(ctx)->font,
                   x,
                   y - gdoTextHeight(ctx),
-                  string,
+                  (char *)string,
                   getGdoPen(ctx));
 }
 
diff -NurbB mscgen.ori/src/renderer/main.c mscgen/src/renderer/main.c
--- mscgen.ori/src/renderer/main.c	2008-02-02 23:48:21.000000000 +0100
+++ mscgen/src/renderer/main.c	2008-02-02 23:54:58.000000000 +0100
@@ -805,10 +805,10 @@
     else if(strcmp(gOutType, "ismap") == 0)
     {
         outType  = ADRAW_FMT_PNG;
-        outImage = tempnam(NULL, "png");
+        outImage = (char *)tmpfile();
         if(!outImage)
         {
-            perror("tempnam() failed");
+            perror("tmpfile() failed");
             return EXIT_FAILURE;
         }