libcaldav built. Build log attached in case you see something different or unusual with building in Slackware.
Minor nit: Source tarball says version is 0.6.5, but unpacks as 0.6.4.
Installed libcaldav.
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Can't build libcarddav. Strange critter. I can't capture the entire build output. The log stops (using tee command) and does not contain the failure messages I see on screen.
I'm attaching the build output using copy and paste from Konsole.
Snippet from build script:
tar xvf $CWD/../zz_src_other/${PRGNAM}_${VERSION}-0debian2.tar.gz cd $TMP/$PRGNAM-$VERSION || exit 1 chown -R root:root . ./autogen.sh make || exit 1 make install DESTDIR=$PKG
Darrell