@supply730 I encountered the same error while installing the built package using Manjaro's pamac manager. It seems the issue is specific to pamac, as neither libalpm nor pacman contain the language "Error while configuring <XXX>" in their source. I believe pamac will alarm if the keyword "error" presents in the output of the post-installation scriptlet (in this case, triggered by gcc's -Werror=
flag): https://github.com/manjaro/libpamac/blob/49bfde599ed00c127869a2797b5bb26e28e11c2a/src/alpm_utils.vala#L2161
I see nothing wrong after the installation and those built products are there as expected. I got no alarm if I install the built package with pacman.
BTW, I think it's advisable to not include this process in the PKGBUILD, as those shared libraries are best built on the system running PyCharm. Otherwise JetBrains would have supplied those binaries in their release tarball: https://www.jetbrains.com/help/pycharm/cython-speedups.html
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