Note that line 12 (pkgconfigdir) has been changed by USES=pathfix.

--- Makefile.am.orig	2020-07-25 08:25:49 UTC
+++ Makefile.am
@@ -6,13 +6,13 @@ pkgdata_DATA = bash_completion
 compatdir = $(sysconfdir)/bash_completion.d
 compat_DATA =
 
-profiledir = $(sysconfdir)/profile.d
+profiledir = $(prefix)/share/bash-completion
 profile_DATA = bash_completion.sh
 
 pkgconfigdir = $(prefix)/libdata/pkgconfig
 pkgconfig_DATA = bash-completion.pc
 
-cmakeconfigdir = $(datadir)/cmake/$(PACKAGE)/
+cmakeconfigdir = $(datadir)/cmake/Modules/$(PACKAGE)/
 cmakeconfig_DATA = bash-completion-config.cmake \
                    bash-completion-config-version.cmake