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Index: gcc-3.4.4/gcc/c-incpath.c
===================================================================
--- gcc-3.4.4.orig/gcc/c-incpath.c	2004-05-31 12:37:47.000000000 +0200
+++ gcc-3.4.4/gcc/c-incpath.c	2006-05-15 20:07:31.000000000 +0200
@@ -328,6 +328,27 @@
   else
     heads[chain] = p;
   tails[chain] = p;
+
+
+#ifdef CROSS_COMPILE
+    /* A common error when cross compiling is including
+    host headers. This code below will try to fail fast
+    for cross compiling. Currently we consider /usr/include,
+    /opt/include and /sw/include as harmful.  */
+	{
+		/* printf("Adding Path: %s\n", p->name ); */
+		if( strstr(p->name, "/usr/include" ) == p->name ) {
+			fprintf(stderr, _("CROSS COMPILE Badness: /usr/include in INCLUDEPATH: %s\n"), p->name);
+			abort();
+		} else if( strstr(p->name, "/sw/include") == p->name ) {
+			fprintf(stderr, _("CROSS COMPILE Badness: /sw/include in INCLUDEPATH: %s\n"), p->name);
+			abort();
+		} else if( strstr(p->name, "/opt/include") == p->name ) {
+			fprintf(stderr, _("CROSS COMPILE Badness: /opt/include in INCLUDEPATH: %s\n"), p->name);
+			abort();
+		}
+	}
+#endif
 }
 
 /* Exported function to handle include chain merging, duplicate