gentoo-overlay/sci-chemistry/mustang/files/mustang-3.2.1-gcc-4.7.patch

--- a/src/superpose_on_core_2.cpp
+++ b/src/superpose_on_core_2.cpp
@@ -55,6 +55,8 @@ using std::ofstream ;
 #include "multiple_superposition.h"
 #include "3D_manip_functions.h"
 
+#include <unistd.h>
+
 int **core_columns ;
 int *core_columns_2 , NCORE = 0 ;
 int **algn_to_seq_hash ;