From: Tomasz Buchert <tomasz@debian.org>
Date: Fri, 1 May 2020 10:31:25 +0200
Subject: fix gcc10 -fno-common build issue

---
 src/gravit.h | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/src/gravit.h b/src/gravit.h
index a67b04f..15771b4 100644
--- a/src/gravit.h
+++ b/src/gravit.h
@@ -604,7 +604,7 @@ typedef struct view_s {
     float popupTextFadeTime;    // ms
 
     int autoCenter;
-    
+
     int glow;          //0: no glow; 1-4: small stars; 4-8: big stars
 
 #ifndef WITHOUT_AGAR
@@ -678,10 +678,10 @@ extern view_t view;
 #else
 
 #ifndef NO_GUI
-video_t video;
+extern video_t video;
 #endif
-state_t state;
-view_t view;
+extern state_t state;
+extern view_t view;
 
 #endif
 
@@ -849,4 +849,3 @@ int luaExecute(char *f);
 #endif
 
 #endif
-
