Merge branch 'bash-completion-prefix' into 'master'

Custom prefix for bash-completion

See merge request nordugrid/arc!914

configure.ac

@@ -1853,7 +1853,7 @@ AC_SEARCH_LIBS([clock_gettime], [rt])
 
 # Define bash-completion dir
 PKG_CHECK_MODULES([BASH_COMPLETION], [bash-completion >= 2.0],
-  [bashcompdir="`pkg-config --variable=completionsdir bash-completion`"],
+  [bashcompdir="`pkg-config --variable=completionsdir --define-variable=prefix=${prefix} bash-completion`"],
   [bashcompdir="${sysconfdir}/bash_completion.d"])
 AC_SUBST([bashcompdir])