Cannot build graphene

[Dave Horsfall]

Early MacBook Pro, High Sierra.

When building graphene, it bails out with:

    Error: Failed to destroot graphene: graphene-gobject-1.0.pc differs in /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_graphene/graphene/work/destroot-i386//opt/local/lib/pkgconfig and /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_graphene/graphene/work/destroot-x86_64//opt/local/lib/pkgconfig and cannot be merged
    Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_graphene/graphene/main.log for details.

The diffs are:

    diff -r /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_graphene/graphene/work/destroot-i386//opt/local/lib/pkgconfig/graphene-1.0.pc /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_graphene/graphene/work/destroot-x86_64//opt/local/lib/pkgconfig/graphene-1.0.pc
    5c5
    < graphene_has_sse2=0
    ---
    > graphene_has_sse2=1
    17c17
    < Cflags: -I${includedir}/graphene-1.0 -I${libdir}/graphene-1.0/include
    ---
    > Cflags: -I${includedir}/graphene-1.0 -I${libdir}/graphene-1.0/include -mfpmath=sse -msse -msse2
    diff -r /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_graphene/graphene/work/destroot-i386//opt/local/lib/pkgconfig/graphene-gobject-1.0.pc /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_graphics_graphene/graphene/work/destroot-x86_64//opt/local/lib/pkgconfig/graphene-gobject-1.0.pc
    4c4
    < graphene_has_sse2=0
    ---
    > graphene_has_sse2=1

I have no idea how to fix this, if it's my fault; I am not compiling with 
+universal and no amount of "port clean" etc will work, so it would appear 
to be a fundamental error (and I don't like filing dud bug reports).

The main.log is attached.

-- Dave
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