Hi, the attached patch fixes the issue (in isl).
Roland
--- isl-0.12.1.orig/include/isl/union_map.h
+++ isl-0.12.1/include/isl/union_map.h
@@ -6,6 +6,7 @@
#include <isl/union_map_type.h>
#include <isl/printer.h>
#include <isl/val.h>
+#include <isl/aff.h>
#if defined(__cplusplus)
extern "C" {
