Index: netris-0.52/game.c
===================================================================
--- netris-0.52.orig/game.c
+++ netris-0.52/game.c
@@ -25,6 +25,7 @@
 #include <stdlib.h>
 #include <ctype.h>
 #include <string.h>
+#include <unistd.h>
 #include <sys/types.h>
 #include <netinet/in.h>
 
Index: netris-0.52/Configure
===================================================================
--- netris-0.52.orig/Configure
+++ netris-0.52/Configure
@@ -76,7 +76,7 @@ done
 CFLAGS="$COPT $CEXTRA"
 
 echo "Checking for libraries"
-echo 'main(){}' > test.c
+echo 'int main(){return 0;}' > test.c
 LFLAGS=""
 for lib in -lcurses -lncurses; do
 	if $CC $CFLAGS $LEXTRA test.c $lib > /dev/null 2>&1; then
