First of all thank you for maintaining an AUR package of madgraph related HEP tools.
Preparing...
Cloning madgraph-pythia8-interface build files...
Checking madgraph-pythia8-interface dependencies...
Building madgraph-pythia8-interface...
==> Making package: madgraph-pythia8-interface 1.0-8 (Fri 24 May 2019 16:37:15 BST)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
-> Found MG5aMC_PY8_interface_V1.0.tar.gz
-> Found python2.patch
-> Found pythia.patch
==> Validating source files with sha256sums...
MG5aMC_PY8_interface_V1.0.tar.gz ... FAILED
python2.patch ... Passed
pythia.patch ... Passed
==> ERROR: One or more files did not pass the validity check!
Preparing...
Cloning madgraph-madanalysis build files...
Checking madgraph-madanalysis dependencies...
Building madgraph-madanalysis...
==> Making package: madgraph-madanalysis 1.1.8-20170424 (Fri 24 May 2019 16:34:29 BST)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
-> Downloading MadAnalysis_V1.1.8.tar.gz...
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0Warning: Transient problem: timeout Will retry in 3 seconds. 3 retries left.
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0Warning: Transient problem: timeout Will retry in 3 seconds. 2 retries left.
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0Warning: Transient problem: timeout Will retry in 3 seconds. 1 retries left.
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0curl: (6) Could not resolve host: madgraph.hep.uiuc.edu
==> ERROR: Failure while downloading http://madgraph.hep.uiuc.edu/Downloads/MadAnalysis_V1.1.8.tar.gz
Aborting...