https://bugs.gentoo.org/706846
https://sources.debian.org/patches/dav-text/0.9.0-2/gcc-10.patch/
--- a/main.c
+++ b/main.c
@@ -58,7 +58,7 @@ char displayWholeScreen = 0;
 struct buffer *buffers;
 struct buffer *currentBuffer;
 int currentBufferNum = 0;
-
+ptrToFunction Fn_ptr[12]; //Bindings for the Fn keys; Fx = Fn_ptr[x-1]
 
 int main(int argc, char *argv[])
 {
--- dav-text-0.9.0.orig/main.h
+++ dav-text-0.9.0/main.h
@@ -47,7 +47,7 @@ void connectLines(struct line *baseline)
 void determineLineNum(struct position *p);
 void countTabs(struct line *l);
 void determineCursX(struct position *p);
-ptrToFunction Fn_ptr[12]; //Bindings for the Fn keys; Fx = Fn_ptr[x-1]
+extern ptrToFunction Fn_ptr[12]; //Bindings for the Fn keys; Fx = Fn_ptr[x-1]
 
 extern int maxY,maxX;
 extern int helpBarUpdate;