--enable-pc-files and nonexistent $PKG_CONFIG_LIBDIR

[Sven Joachim]

Hi,

This has disturbed me, and apparently other people as well[1,2], for
quite some time: if the --enable-pc-files option is given (and,
optionally, --with-pkg-config-libdir), but the directory where the .pc
files are to be installed does not exist, pkg-config support gets
disabled.

What are the reasons that the CF_ENABLE_PC_FILES macro disables
pkg-config support if $PKG_CONFIG_LIBDIR does not exist?  I can imagine
that there will be a problem if it exists and is a non-directory, but if
it's not there, "make install" should just create it.

Cheers,
       Sven


1. http://patches.openembedded.org/patch/8447/
2. http://lists.gnu.org/archive/html/gpsd-users/2012-07/msg00053.html