According to the blame output, this is from r70792. I'm building on Arch Linux
and the cmake flags are based on the PKGBUILD from the AUR:
```
cmake -DBRLCAD_BUILD_STATIC_LIBS=OFF \
-DBRLCAD_ENABLE_OPENGL=ON -DBRLCAD_BUNDLED_LIBS=BUNDLED
-DBRLCAD_FREETYPE=OFF \
-DBRLCAD_PNG=OFF -DBRLCAD_REGEX=OFF -DBRLCAD_ZLIB=OFF
-DBRLCAD_ENABLE_QT=OFF ../..
```
Log:
```
[ 43%] Building C object
src/librt/CMakeFiles/librt-obj.dir/primitives/bot/gct_decimation/auxiliary/mmbinsort.c.o
In file included from
/home/rain/Sync/gsoc/brlcad-code/src/librt/primitives/bot/gct_decimation/auxiliary/mm.h:40:0,
from
/home/rain/Sync/gsoc/brlcad-code/src/librt/primitives/bot/gct_decimation/auxiliary/mmbinsort.c:41:
/home/rain/Sync/gsoc/brlcad-code/src/librt/primitives/bot/gct_decimation/auxiliary/mmthread.h:52:8:
error: redefinition of ‘struct timespec’
struct timespec {
^~~~~~~~
In file included from /usr/include/sched.h:32:0,
from /usr/include/pthread.h:23,
from /home/rain/Sync/gsoc/brlcad-code/include/bu/tc.h:42,
from
/home/rain/Sync/gsoc/brlcad-code/src/librt/primitives/bot/gct_decimation/auxiliary/mmthread.h:46,
from
/home/rain/Sync/gsoc/brlcad-code/src/librt/primitives/bot/gct_decimation/auxiliary/mm.h:40,
from
/home/rain/Sync/gsoc/brlcad-code/src/librt/primitives/bot/gct_decimation/auxiliary/mmbinsort.c:41:
/usr/include/bits/types/struct_timespec.h:8:8: note: originally defined here
struct timespec
^~~~~~~~
cc1: error: unrecognized command line option ‘-Wno-c11-extensions’ [-Werror]
```
------------------------------------------------------------------------------
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