Hello!
Happily stumbled across your project, and I seem to be up and running on an
intel mac with the install directions in the README (which btw references an
INSTALL file that doesn't exist). But I wanted to report some shellcheck
failures during `make check`:
```
make check-TESTS
make[3]: Entering directory '/Users/cnmne/hack/code/repos/libredwg'
In ./log line 21:
if [ -n "dsymutil" ]; then
^------^ SC2157 (error): Argument to -n is always true due to literal
strings.
For more information:
https://www.shellcheck.net/wiki/SC2157 -- Argument to -n is always true due...
FAIL: log
In ./dwg line 25:
if [ -n "dsymutil" ]; then
^------^ SC2157 (error): Argument to -n is always true due to literal
strings.
For more information:
https://www.shellcheck.net/wiki/SC2157 -- Argument to -n is always true due...
FAIL: dwg
In ./dxf line 25:
if [ -n "dsymutil" ]; then
^------^ SC2157 (error): Argument to -n is always true due to literal
strings.
For more information:
https://www.shellcheck.net/wiki/SC2157 -- Argument to -n is always true due...
FAIL: dxf
In ./json line 25:
if [ -n "dsymutil" ]; then
^------^ SC2157 (error): Argument to -n is always true due to literal
strings.
For more information:
https://www.shellcheck.net/wiki/SC2157 -- Argument to -n is always true due...
FAIL: json
In ./svg line 20:
if [ -n "dsymutil" ]; then
^------^ SC2157 (error): Argument to -n is always true due to literal
strings.
For more information:
https://www.shellcheck.net/wiki/SC2157 -- Argument to -n is always true due...
FAIL: svg
In ./rw line 25:
if [ -n "dsymutil" ]; then
^------^ SC2157 (error): Argument to -n is always true due to literal
strings.
For more information:
https://www.shellcheck.net/wiki/SC2157 -- Argument to -n is always true due...
FAIL: rw
```
Thanks for this project!
