The travis error is weird and I get another error trying to build perlPackages.ApacheTest:

…
cp lib/Apache/TestConfigParrot.pm blib/lib/Apache/TestConfigParrot.pm
cp lib/Apache/TestPerlDB.pm blib/lib/Apache/TestPerlDB.pm
cp lib/Apache/Test5005compat.pm blib/lib/Apache/Test5005compat.pm
Manifying 15 pod documents
running tests
"/nix/store/raylbbdkg4yz21c44fwcv63bzvj7a1i1-perl-5.24.2/bin/perl" -Iblib/arch -Iblib/lib \
t/TEST  -clean
[warning] setting ulimit to allow core files
ulimit -c unlimited; /nix/store/raylbbdkg4yz21c44fwcv63bzvj7a1i1-perl-5.24.2/bin/perl /tmp/nix-build-perl-Apache-Test-1.40.drv-0/Apache-Test-1.40/t/TEST -clean
Use of uninitialized value $proto in socket at lib/Apache/TestServer.pm line 383.
make: *** [Makefile:973: test_clean] Error 2
builder for ‘/nix/store/9gw0rxighxfj18rmpkv45iaxad2h1ycl-perl-Apache-Test-1.40.drv’ failed with exit code 2
error: build of ‘/nix/store/9gw0rxighxfj18rmpkv45iaxad2h1ycl-perl-Apache-Test-1.40.drv’ failed

Odd, I'm testing now with sandbox enabled using the appliance linked from https://nixos.org/nixos/download.html.
This is odd as I get different errors running within the nixos image and on travis. The other travis job says something about a perl compile flag. The local build failed with another perl dependency error:

So it looks like the errror comes from this line: https://metacpan.org/source/SHAY/Apache-Test-1.40/lib/Apache/TestServer.pm#L383. I've reproduced the error by running nix-shell -p gzip --run "nix-env -f https://github.com/NixOS/nixpkgs/archive/master.tar.gz -iA perlPackages.libapreq2" from within a docker container. The error looks like it is unable to spin up a test server or something. I think this issue may have been lurking in master and not necessarily related to the bump to 2.4.29. I am going to see about a patch or something.

Merged since this failure already exists on master and shouldn't block this, but feel free to fix this nonetheless :)