The error is to be found in lines 266 to 294 of config.log when configure tries to compile a small program just to test whether linking with libneon works. The compiler is called like this:

gcc -o conftest -g -O2 -I/usr/include/neon   conftest.c -Wl,-z,relro -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -lneon

and the error is:

gcc: error: /usr/lib/rpm/redhat/redhat-hardened-ld: No such file or directory

You will probably have to install some additional package that contains that /usr/lib/rpm/redhat/redhat-hardened-ld. (I am not familiar with RPM and therefore can't help you to find the package you need.)

Additional information:
I am not sure whether this is really necessary. davfs2 uses macro NEON_USE_EXTERNAL to test for the correct version of libneon. This macro is in file config/neon.m4 which I have taken from the neon sources. To get all the necessary compiler arguments this macro calls "neon-config --libs" and "neon-config --cflags". As far as I can see the output of neon-config lists more libs and flags than necessary.

Can you please run "neon-config --libs" and "neon-config --cflags" and post the result?

Werner