Index: gmsh-4.11.1-source/src/mesh/meshGFacePack.cpp
===================================================================
--- gmsh-4.11.1-source.orig/src/mesh/meshGFacePack.cpp
+++ gmsh-4.11.1-source/src/mesh/meshGFacePack.cpp
@@ -5,6 +5,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <cstdint>
 #include <queue>
 #include <map>
 #include <vector>