Index: fact/tools/rootmacros/gainanalysis.C
===================================================================
--- fact/tools/rootmacros/gainanalysis.C	(revision 12298)
+++ fact/tools/rootmacros/gainanalysis.C	(revision 12299)
@@ -10,4 +10,5 @@
 #include <cstdio>
 
+#define HAVE_ZLIB
 #include "fits.h"
 #include "FOpenDataFile.c"