diff --git a/historic/jam/src/strings.c b/historic/jam/src/strings.c
index 4c4f0b71f..10330ea29 100644
--- a/historic/jam/src/strings.c
+++ b/historic/jam/src/strings.c
@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <assert.h>
+#include <stdio.h>
 
 
 #ifndef NDEBUG
@@ -183,3 +184,4 @@ void string_unit_test()
     
 }
 #endif
+
diff --git a/historic/jam/src/subst.c b/historic/jam/src/subst.c
index 471b8a563..c164729ec 100644
--- a/historic/jam/src/subst.c
+++ b/historic/jam/src/subst.c
@@ -1,4 +1,5 @@
 #include <stddef.h>
+#include "jam.h"
 #include "regexp.h"
 #include "hash.h"
 
@@ -90,3 +91,4 @@ builtin_subst(
   
   return result;
 }
+
diff --git a/jam_src/strings.c b/jam_src/strings.c
index 4c4f0b71f..10330ea29 100644
--- a/jam_src/strings.c
+++ b/jam_src/strings.c
@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <assert.h>
+#include <stdio.h>
 
 
 #ifndef NDEBUG
@@ -183,3 +184,4 @@ void string_unit_test()
     
 }
 #endif
+
diff --git a/jam_src/subst.c b/jam_src/subst.c
index 471b8a563..c164729ec 100644
--- a/jam_src/subst.c
+++ b/jam_src/subst.c
@@ -1,4 +1,5 @@
 #include <stddef.h>
+#include "jam.h"
 #include "regexp.h"
 #include "hash.h"
 
@@ -90,3 +91,4 @@ builtin_subst(
   
   return result;
 }
+