--- fastx_toolkit-0.0.13/src/libfastx/sequence_alignment.h	2010-01-29 22:32:21.000000000 +0000
+++ fastx_toolkit-0.0.13.new/src/libfastx/sequence_alignment.h	2012-01-09 11:09:36.142686410 +0000
@@ -19,6 +19,7 @@
 #define __SEQUENCE_ALIGNMENT_HEADER__
 
 #include <err.h>
+#include <unistd.h>
 
 struct SequenceAlignmentResults
 {