wit fails to build with CFLAGS="-fno-common".
gcc-10 and above flipped a default from -fcommon to -fno-common, see gcc bug 85678.
This patch seems to fix the error:
diff --git a/dclib/dclib-basics.c b/dclib/dclib-basics.c
index 4a338e0..f1a6ada 100644
--- a/dclib/dclib-basics.c
+++...