Bug#973196: monero: FTBFS: optional.hpp:1591:3: error: static assertion failed: If you want to output boost::optional, include header

[ErCiccione]

Another Monero dev (Xiphon) has offered a different possible solution on IRC 
(Freenode: #monero-dev):

according to the Debian's build log, boost::optional is not missing. also i'm 
sure it is installed as a dependency. for example, they have 
libboost-chrono-dev in their package list and it depends on libboost-dev thus i 
don't think the issue is caused by missing boost::optional
it might be another reason, version mismatch or something... But looking at the 
test case, i would just do something like

--- a/tests/unit_tests/wipeable_string.cpp
+++ b/tests/unit_tests/wipeable_string.cpp
@@ -189,20 +189,20 @@ TEST(wipeable_string, parse_hexstr)
 {
   boost::optional<epee::wipeable_string> s;
 

-  ASSERT_EQ(boost::none, epee::wipeable_string("x").parse_hexstr());
-  ASSERT_EQ(boost::none, 
epee::wipeable_string("x0000000000000000").parse_hexstr());
-  ASSERT_EQ(boost::none, 
epee::wipeable_string("0000000000000000x").parse_hexstr());
-  ASSERT_EQ(boost::none, epee::wipeable_string("0").parse_hexstr());
-  ASSERT_EQ(boost::none, epee::wipeable_string("000").parse_hexstr());
+  ASSERT_TRUE(boost::none == epee::wipeable_string("x").parse_hexstr());
+  ASSERT_TRUE(boost::none == 
epee::wipeable_string("x0000000000000000").parse_hexstr());
+  ASSERT_TRUE(boost::none == 
epee::wipeable_string("0000000000000000x").parse_hexstr());
+  ASSERT_TRUE(boost::none == epee::wipeable_string("0").parse_hexstr());
+  ASSERT_TRUE(boost::none == epee::wipeable_string("000").parse_hexstr());
 

   ASSERT_TRUE((s = epee::wipeable_string("").parse_hexstr()) != boost::none);
-  ASSERT_EQ(*s, "");
+  ASSERT_TRUE(*s == "");
   ASSERT_TRUE((s = epee::wipeable_string("00").parse_hexstr()) != boost::none);
-  ASSERT_EQ(*s, epee::wipeable_string("", 1));
+  ASSERT_TRUE(*s == epee::wipeable_string("", 1));
   ASSERT_TRUE((s = epee::wipeable_string("41").parse_hexstr()) != boost::none);
-  ASSERT_EQ(*s, epee::wipeable_string("A"));
+  ASSERT_TRUE(*s == epee::wipeable_string("A"));
   ASSERT_TRUE((s = epee::wipeable_string("414243").parse_hexstr()) != 
boost::none);
-  ASSERT_EQ(*s, epee::wipeable_string("ABC"));
+  ASSERT_TRUE(*s == epee::wipeable_string("ABC"));
 }
 

 TEST(wipeable_string, to_hex)

should fix the issue

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