diff --git a/src/config-amigaos.h b/src/config-amigaos.h
index ca700ad47..ab6d28826 100644
--- a/src/config-amigaos.h
+++ b/src/config-amigaos.h
@@ -2,6 +2,9 @@
 #ifndef CURL_CONFIG_AMIGAOS_H
 #define CURL_CONFIG_AMIGAOS_H
 
+/* Define to 1 if you want the built-in manual */
+#define USE_MANUAL 1
+
 #define OS "AmigaOS"
 
 #define HAVE_UNISTD_H		1
diff --git a/src/config-mac.h b/src/config-mac.h
index e43a9a593..a6f58e685 100644
--- a/src/config-mac.h
+++ b/src/config-mac.h
@@ -1,3 +1,6 @@
+/* Define to 1 if you want the built-in manual */
+#define USE_MANUAL 1
+
 #define HAVE_UNISTD_H		1
 #define HAVE_FCNTL_H		1
 #define HAVE_UTIME_H		1
diff --git a/src/config-netware.h b/src/config-netware.h
index 31180ac17..20baa2ac0 100644
--- a/src/config-netware.h
+++ b/src/config-netware.h
@@ -1,5 +1,8 @@
 /* lib/config.h.in.  Generated from configure.ac by autoheader.  */
 
+/* Define to 1 if you want the built-in manual */
+#define USE_MANUAL 1
+
 /* to disable DICT */
 #undef CURL_DISABLE_DICT
 
diff --git a/src/config-riscos.h b/src/config-riscos.h
index 79e1974bb..46de289b9 100644
--- a/src/config-riscos.h
+++ b/src/config-riscos.h
@@ -11,6 +11,9 @@
 /* Define cpu-machine-OS */
 #define OS "ARM-RISC OS"
 
+/* Define to 1 if you want the built-in manual */
+#define USE_MANUAL 1
+
 /* Define if you have the gethostbyaddr_r() function with 5 arguments */
 #undef HAVE_GETHOSTBYADDR_R_5
 
diff --git a/src/config-vms.h b/src/config-vms.h
index 26aabd927..79f1ba7b7 100644
--- a/src/config-vms.h
+++ b/src/config-vms.h
@@ -2,6 +2,9 @@
 /* Define cpu-machine-OS */
 #define OS "ALPHA-COMPAQ-VMS"
 
+/* Define to 1 if you want the built-in manual */
+#define USE_MANUAL 1
+
 /* Define if you have the <unistd.h> header file.  */
 #define HAVE_UNISTD_H 1
 
diff --git a/src/config-win32.h b/src/config-win32.h
index db2805900..308ab2d2c 100644
--- a/src/config-win32.h
+++ b/src/config-win32.h
@@ -2,6 +2,9 @@
 /* Define if you have the stricmp function.  */
 #define HAVE_STRICMP 1
 
+/* Define to 1 if you want the built-in manual */
+#define USE_MANUAL 1
+
 /* Define cpu-machine-OS */
 #define OS "i386-pc-win32"