fix debug build

src/util/params.cpp

@@ -1046,6 +1046,7 @@ void params::set_sym(char const * k, symbol const & v) {
 }
 
 #ifdef Z3DEBUG
+#include <iostream>
 void pp(params_ref const & p) {
     std::cout << p << std::endl;
 }

src/util/small_object_allocator.cpp

@@ -24,6 +24,9 @@ Revision History:
 #include "util/util.h"
 #include "util/vector.h"
 #include<iomanip>
+#ifdef Z3DEBUG
+# include <iostream>
+#endif
 
 small_object_allocator::small_object_allocator(char const * id) {
     for (unsigned i = 0; i < NUM_SLOTS; i++) {