Index: navigation-1.13.0/navfn/src/navtest.cpp
===================================================================
--- navfn/src/navtest.cpp
+++ navfn/src/navtest.cpp
@@ -21,7 +21,7 @@ using namespace navfn;
 extern "C" {
 #include <stdio.h>
 // pgm.h is not very friendly with system headers... need to undef max() and min() afterwards
-#include <pgm.h>
+#include <netpbm/pgm.h>
 #undef max
 #undef min
 }
Index: navigation-1.13.0/navfn/src/read_pgm_costmap.cpp
===================================================================
--- navfn/src/read_pgm_costmap.cpp
+++ navfn/src/read_pgm_costmap.cpp
@@ -37,7 +37,7 @@
 extern "C" {
 #include <stdio.h>
 // pgm.h is not very friendly with system headers... need to undef max() and min() afterwards
-#include <pgm.h>
+#include <netpbm/pgm.h>
 #undef max
 #undef min
 }