--- /dev/null
+--- a/CRT.h
++++ b/CRT.h
+@@ -140,7 +140,7 @@ extern const char **CRT_treeStr;
+
+ extern int CRT_delay;
+
+-int* CRT_colors;
++extern int* CRT_colors;
+
+ extern int CRT_colorSchemes[LAST_COLORSCHEME][LAST_COLORELEMENT];
+
+@@ -150,13 +150,13 @@ extern int CRT_scrollHAmount;
+
+ extern int CRT_scrollWheelVAmount;
+
+-char* CRT_termType;
++extern char* CRT_termType;
+
+ // TODO move color scheme to Settings, perhaps?
+
+ extern int CRT_colorScheme;
+
+-void *backtraceArray[128];
++extern void *backtraceArray[128];
+
+ #if HAVE_SETUID_ENABLED
+