Failure to compile Poppler - 10.5

[Riccardo Mottola]

Hi,

I am updateing ports on my 10.5 i386-64 MacBook (that first, then i386 
and last PPC will follow, given the increasing difficulties).
I fail on poppler, while using clang.

[  1%] Building CXX object CMakeFiles/poppler.dir/goo/GooString.cc.o
/opt/local/bin/clang++-mp-7.0 -Dpoppler_EXPORTS 
-I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_poppler/poppler/work/poppler-20.09.0 
-I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_poppler/poppler/work/poppler-20.09.0/fofi 
-I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_poppler/poppler/work/poppler-20.09.0/goo 
-I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_poppler/poppler/work/poppler-20.09.0/poppler 
-I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_poppler/poppler/work/build 
-I/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_poppler/poppler/work/build/poppler 
-isystem /opt/local/include -isystem /opt/local/include/freetype2 
-isystem /opt/local/include/openjpeg-2.3 -isystem 
/opt/local/include/nss -isystem /opt/local/include/nspr -Wall -Wextra 
-Wpedantic -Wno-unused-parameter -Wcast-align -Wformat-security 
-Wframe-larger-than=65536 -Wmissing-format-attribute 
-Wnon-virtual-dtor -Woverloaded-virtual -Wmissing-declarations -Wundef 
-Wzero-as-null-pointer-constant -Wshadow -fno-exceptions 
-fno-check-new -fno-common -D_DEFAULT_SOURCE -arch x86_64 
-mmacosx-version-min=10.5 -fPIC -std=c++14 -o 
CMakeFiles/poppler.dir/goo/GooString.cc.o -c 
/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_poppler/poppler/work/poppler-20.09.0/goo/GooString.cc
In file included from 
/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_poppler/poppler/work/poppler-20.09.0/goo/GooString.cc:48:
In file included from 
/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_poppler/poppler/work/poppler-20.09.0/goo/gmem.h:33:
/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_poppler/poppler/work/poppler-20.09.0/goo/GooCheckedOps.h:17:10: 
fatal error: 'type_traits' file not found
#include <type_traits>
          ^~~~~~~~~~~~~
1 error generated.


at a first glance, this does not seem like a platform-specific or 
compiler error issue, what do you think?

Riccardo