vere: add -fcommon to be compatible with gcc 10
gcc 9 and earlier default to -fcommon, i.e. linker merges identical symbols. gcc 10 defaults
to -fno-common, and the build breaks because c3_global is not defined anywhere.
@@ -93,7 +93,7 @@ do LDFLAGS="${LDFLAGS-} -I$header"
done
cat >config.mk <<EOF
-CFLAGS := ${CFLAGS-} -funsigned-char -ffast-math -std=gnu99
+CFLAGS := ${CFLAGS-} -funsigned-char -ffast-math -fcommon -std=gnu99
LDFLAGS := $LDFLAGS
CC := ${CC-cc}
EOF
