Robert P. Day removed 8 gazillion occurrences of "extern" on function
definitions.  (That should only be on prototypes.)
diff --git a/libbb/copyfd.c b/libbb/copyfd.c
index 5152531..d138f3e 100644
--- a/libbb/copyfd.c
+++ b/libbb/copyfd.c
@@ -62,7 +62,7 @@
 }
 
 
-extern int bb_copyfd_size(int fd1, int fd2, const off_t size)
+int bb_copyfd_size(int fd1, int fd2, const off_t size)
 {
 	if (size) {
 		return(bb_full_fd_action(fd1, fd2, size));
@@ -70,7 +70,7 @@
 	return(0);
 }
 
-extern int bb_copyfd_eof(int fd1, int fd2)
+int bb_copyfd_eof(int fd1, int fd2)
 {
 	return(bb_full_fd_action(fd1, fd2, 0));
 }