I build inkscape on this machine, with the same set of flags that
I'm currently using, just under a week ago.  But now on 10.0-rc1 it
fails:

cd /scratch/working/inkscape-1.0_2020-05-01_4035a4fb49/build/src && 
/usr/bin/c++ -DHAVE_CONFIG_H -DWITH_CSSBLEND -DWITH_CSSCOMPOSITE -DWITH_MESH 
-DWITH_SVG2 -Dinkscape_base_EXPORTS 
-I/scratch/working/inkscape-1.0_2020-05-01_4035a4fb49/build/src 
-I/scratch/working/inkscape-1.0_2020-05-01_4035a4fb49/src 
-I/scratch/working/inkscape-1.0_2020-05-01_4035a4fb49 
-I/scratch/working/inkscape-1.0_2020-05-01_4035a4fb49/build/include 
-I/scratch/working/inkscape-1.0_2020-05-01_4035a4fb49/src/3rdparty/adaptagrams 
-isystem /usr/include/pango-1.0 -isystem /usr/include/fribidi -isystem 
/usr/include/cairo -isystem /usr/include/pixman-1 -isystem /usr/include/uuid 
-isystem /usr/include/freetype2 -isystem /usr/include/libpng16 -isystem 
/usr/include/harfbuzz -isystem /usr/include/libsoup-2.4 -isystem 
/usr/include/libxml2 -isystem /usr/include/libmount -isystem /usr/include/blkid 
-isystem /usr/include/glib-2.0 -isystem /usr/lib/glib-2.0/include -isystem 
/usr/include/gc -isystem /usr/include/poppler -isystem /usr/include/gtkmm-3.0 
-isystem /usr/lib/gtkmm-3.0/include -isystem /usr/include/atkmm-1.6 -isystem 
/usr/include/gtk-3.0/unix-print -isystem /usr/include/gdkmm-3.0 -isystem 
/usr/lib/gdkmm-3.0/include -isystem /usr/include/giomm-2.4 -isystem 
/usr/lib/giomm-2.4/include -isystem /usr/include/pangomm-1.4 -isystem 
/usr/lib/pangomm-1.4/include -isystem /usr/include/glibmm-2.4 -isystem 
/usr/lib/glibmm-2.4/include -isystem /usr/include/cairomm-1.0 -isystem 
/usr/lib/cairomm-1.0/include -isystem /usr/include/sigc++-2.0 -isystem 
/usr/lib/sigc++-2.0/include -isystem /usr/include/libgdl-3.0 -isystem 
/usr/include/gtk-3.0 -isystem /usr/include/at-spi2-atk/2.0 -isystem 
/usr/include/at-spi-2.0 -isystem /usr/include/dbus-1.0 -isystem 
/usr/lib/dbus-1.0/include -isystem /usr/include/gio-unix-2.0 -isystem 
/usr/include/libdrm -isystem /usr/include/atk-1.0 -isystem 
/usr/include/gdk-pixbuf-2.0 -O3 -march=native -fstack-clash-protection 
-D_FORTIFY_SOURCE=2 -fstack-protector-strong -D_GLIBCXX_ASSERTIONS 
-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fstack-protector-strong -Werror=format 
-Werror=format-security -pthread -fopenmp -O3 -DNDEBUG -fPIC   -pthread -fPIC 
-std=gnu++11 -o CMakeFiles/inkscape_base.dir/ui/tool/node.cpp.o -c 
/scratch/working/inkscape-1.0_2020-05-01_4035a4fb49/src/ui/tool/node.cpp
/scratch/working/inkscape-1.0_2020-05-01_4035a4fb49/src/ui/tool/node.cpp:100:25:
 error: field 'rel_error' has incomplete type 'std::atomic<double>'
  100 |     std::atomic<double> rel_error; /// Cached relative error
      |                         ^~~~~~~~~
In file included from /usr/include/c++/10.2.0/bits/shared_ptr_atomic.h:33,
                 from /usr/include/c++/10.2.0/memory:85,
                 from 
/scratch/working/inkscape-1.0_2020-05-01_4035a4fb49/src/preferences.h:21,
                 from 
/scratch/working/inkscape-1.0_2020-05-01_4035a4fb49/src/desktop.h:33,
                 from 
/scratch/working/inkscape-1.0_2020-05-01_4035a4fb49/src/ui/tool/node.cpp:19:
/usr/include/c++/10.2.0/bits/atomic_base.h:152:12: note: declaration of 'struct 
std::atomic<double>'
  152 |     struct atomic;
      |            ^~~~~~
make[2]: *** [src/CMakeFiles/inkscape_base.dir/build.make:5120: 
src/CMakeFiles/inkscape_base.dir/ui/tool/node.cpp.o] Error 1

Note the 'Cached relative error' comment.

After some random searches without any relevant results, I
eventually discovered that boost has a concept of a 'relative
error'.

But I'm guessing this might be the first time anybody has tried to
build inkscape with boost-1.74.0.  No idea how to fix it.

ĸen
-- 
Juliet's version of cleanliness was next to godliness, which was to
say it was erratic, past all understanding and was seldom seen.
                          -- Unseen Academicals
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