Add missing include statement.

This fixes issue https://github.com/larskanis/fxruby/issues/20

Add missing include statement.
eb5d857f · Lars Kanis · 6e528dac · eb5d857f
Commit eb5d857f authored 9 years ago by Lars Kanis
--- a/ext/fox16_c/FXRbApp.cpp
+++ b/ext/fox16_c/FXRbApp.cpp
@@ -37,6 +37,7 @@ extern "C" {
 #endif
 #ifndef WIN32
+  #include <unistd.h>
  #include <fcntl.h>
 #endif