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[tduell <1597594@xxxxxxxxxxxxxxxxxx>]

OK, I do have "boost/optional.hpp", it is in /usr/include, but FindOptional is not finding it.
I tried a local change as follows...

diff -r c8d6c0d1a6fe CMakeModules/FindOptional.cmake
--- a/CMakeModules/FindOptional.cmake	Sun Jul 03 18:11:07 2016 +0200
+++ b/CMakeModules/FindOptional.cmake	Wed Jul 06 15:05:42 2016 +1000
@@ -4,8 +4,8 @@
 ENDIF()
 
 FIND_PATH(OPTIONAL_INCLUDE_DIR optional.hpp
-  /usr/local/include
-  /usr/include
+  /usr/local/include/boost
+  /usr/include/boost
   ${SOURCE_BASE_DIR}/Optional-master
 )

and cmake now finds optional in Fedora 24, for what it's worth.
Doesn't help fix the original issue, which appears to be a result of changes introduced in boost-1.60.0.

Cheers,
Terry

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https://bugs.launchpad.net/bugs/1597594

Title:
  Enblend-4.3-1472 fails to build in FC24

Status in Enblend:
  New

Bug description:
  Attempting to build Enblend-4.3-1472 (current default branch) in Fedora 24, using rpmbuild.
  The build fails with the following message...

  In file included from /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/enblend.cc:81:0:
  /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/optional_transitional.hpp:51:31: error: no matching function for call to 'boost::none_t::none_t()'
       constexpr ::boost::none_t nullopt;
                                 ^~~~~~~
  In file included from /usr/include/boost/none.hpp:16:0,
                   from /usr/include/boost/optional/optional.hpp:51,
                   from /usr/include/boost/optional.hpp:15,
                   from /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/optional_transitional.hpp:47,
                   from /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/enblend.cc:81:
  /usr/include/boost/none_t.hpp:32:12: note: candidate: boost::none_t::none_t(boost::none_t::init_tag)
     explicit none_t(init_tag){} // to prevent default constructor
              ^~~~~~
  /usr/include/boost/none_t.hpp:32:12: note:   candidate expects 1 argument, 0 provided
  /usr/include/boost/none_t.hpp:29:8: note: candidate: constexpr boost::none_t::none_t(const boost::none_t&)
   struct none_t
          ^~~~~~
  /usr/include/boost/none_t.hpp:29:8: note:   candidate expects 1 argument, 0 provided
  /usr/include/boost/none_t.hpp:29:8: note: candidate: constexpr boost::none_t::none_t(boost::none_t&&)
  /usr/include/boost/none_t.hpp:29:8: note:   candidate expects 1 argument, 0 provided
  In file included from /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/enblend.cc:190:0:
  /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/common.h: In function 'std::__cxx11::string enblend::expandFilenameTemplate(const string&, unsigned int, const string&, const string&, unsigned int)':
  /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/common.h:760:25: warning: attributes at the beginning of statement are ignored [-Wattributes]
                           [[fallthrough]];
                           ^
  In file included from /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/mask.h:42:0,
                   from /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/enblend.h:46,
                   from /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/enblend.cc:193:
  /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/fillpolygon.hxx: In function 'void vigra_ext::detail::group_to_pairs(Iterator, Iterator, BackInsertIterator)':
  /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/fillpolygon.hxx:255:21: warning: attributes at the beginning of statement are ignored [-Wattributes]
                       [[fallthrough]];
                       ^
  /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/enblend.cc: In function 'int process_options(int, char**)':
  /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/enblend.cc:926:13: warning: attributes at the beginning of statement are ignored [-Wattributes]
               [[fallthrough]];
               ^
  /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/enblend.cc:933:13: warning: attributes at the beginning of statement are ignored [-Wattributes]
               [[fallthrough]];
               ^
  /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/enblend.cc:965:13: warning: attributes at the beginning of statement are ignored [-Wattributes]
               [[fallthrough]];
               ^
  /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/enblend.cc:1051:13: warning: attributes at the beginning of statement are ignored [-Wattributes]
               [[fallthrough]];
               ^
  /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/enblend.cc:1063:13: warning: attributes at the beginning of statement are ignored [-Wattributes]
               [[fallthrough]];
               ^
  /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/enblend.cc:1355:13: warning: attributes at the beginning of statement are ignored [-Wattributes]
               [[fallthrough]];
               ^
  /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/enblend.cc:1390:13: warning: attributes at the beginning of statement are ignored [-Wattributes]
               [[fallthrough]];
               ^
  /home/terry/rpmbuild/BUILD/enblend-4.3.0-1472hg-Source/src/enblend.cc:1495:13: warning: attributes at the beginning of statement are ignored [-Wattributes]
               [[fallthrough]];
               ^
  src/CMakeFiles/enblend.dir/build.make:65: recipe for target 'src/CMakeFiles/enblend.dir/enblend.cc.o' failed
  make[2]: *** [src/CMakeFiles/enblend.dir/enblend.cc.o] Error 1

  this source build OK using the same rpmbuild .spec file in Fedora 23,
  so looks like an issue brought about by changes in Fedora.

  Cheers,
  Terry

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