diff --git a/include/nsysnet/socket.h b/include/nsysnet/socket.h
index 75f010e..4f3c5e6 100644
--- a/include/nsysnet/socket.h
+++ b/include/nsysnet/socket.h
@@ -70,7 +70,7 @@ struct linger
 };
 
 #ifdef __cplusplus
-"C" {
+extern "C" {
 #endif
 
 void
diff --git a/include/proc_ui/procui.h b/include/proc_ui/procui.h
index 91ea06d..521e7e8 100644
--- a/include/proc_ui/procui.h
+++ b/include/proc_ui/procui.h
@@ -8,7 +8,7 @@
  */
 
 #ifdef __cplusplus
-"C" {
+extern "C" {
 #endif
 
 typedef void (*ProcUISaveCallback)(void);
@@ -59,7 +59,7 @@ void
 ProcUIShutdown();
 
 ProcUIStatus
-ProcUISubProcessMessages();
+ProcUISubProcessMessages(BOOL block);
 
 #ifdef __cplusplus
 }
diff --git a/include/sysapp/launch.h b/include/sysapp/launch.h
index e48a10e..f281771 100644
--- a/include/sysapp/launch.h
+++ b/include/sysapp/launch.h
@@ -8,7 +8,7 @@
  */
 
 #ifdef __cplusplus
-"C" {
+extern "C" {
 #endif
 
 void
diff --git a/include/sysapp/switch.h b/include/sysapp/switch.h
index 0fcc7aa..ad4f854 100644
--- a/include/sysapp/switch.h
+++ b/include/sysapp/switch.h
@@ -8,7 +8,7 @@
  */
 
 #ifdef __cplusplus
-"C" {
+extern "C" {
 #endif
 
 //TODO
diff --git a/include/vpad/input.h b/include/vpad/input.h
index 7e95922..b476a66 100644
--- a/include/vpad/input.h
+++ b/include/vpad/input.h
@@ -8,7 +8,7 @@
  */
 
 #ifdef __cplusplus
-"C" {
+extern "C" {
 #endif
 
 typedef struct VPADVec2D VPADVec2D;