Errors installing Qwt, High Sierra

[K J <kj7...@gm...>]

Hi all,

I'm new to Qwt and am trying to install Qwt on a macbook pro with High
Sierra, version 10.13.6. I'm using Qt version 5.12.2, with the following
qmake version:
`$/Users/userme/Qt/5.12.2/clang_64/bin/qmake -v

  QMake version 3.1

  Using Qt version 5.12.2 in /Users/userme/Qt/5.12.2/clang_64/lib`

I downloaded qwt-6.1.4 and extracted it to /usr/local, and am following the
instructions here: https://qwt.sourceforge.io/qwtinstall.html

I run into issues in the "Build" portion of the instructions. The first two
commands, `/Users/userme/Qt/5.12.2/clang_64/bin/qmake qwt.pro` and `make` seem
to run ok (though I do get some `make[1]: Nothing to be done for
'first'` warnings
when I run the `make` command, but read online that they shouldn't be an
issue...).

The error comes from running the `sudo make install` command:

`$sudo make install

cd src/ && ( test -e Makefile || /Users/userme/Qt/5.12.2/clang_64/bin/qmake
-o Makefile /usr/local/qwt-6.1.4/src/src.pro ) &&
/Applications/Xcode.app/Contents/Developer/usr/bin/make -f Makefile install

rm -f -r /usr/local/qwt-6.1.4/lib/qwt.framework

/Users/userme/Qt/5.12.2/clang_64/bin/qmake -install qinstall
../lib/qwt.framework /usr/local/qwt-6.1.4/lib/qwt.framework

Error copying ../lib/qwt.framework to
/usr/local/qwt-6.1.4/lib/qwt.framework: Cannot open ../lib/qwt.framework
for input

make[1]: [install_target] Error 3 (ignored)

...`

It seems the install command first removes the qwt.framework file, then
tries to access it, giving this error. Has anyone seen this before and do
you have suggestions for resolving the issue?

Thank you!