==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Cloning Papilio-Loader git repo...
Cloning into bare repository '/home/david/aur/papilio-loader-git/Papilio-Loader'...
remote: Reusing existing pack: 1259, done.
remote: Counting objects: 6, done.
remote: Compressing objects: 100% (6/6), done.
remote: Total 1265 (delta 0), reused 4 (delta 0)
Receiving objects: 100% (1265/1265), 20.03 MiB | 1.21 MiB/s, done.
Resolving deltas: 100% (566/566), done.
Checking connectivity... done.
==> Validating source files with md5sums...
    Papilio-Loader ... Skipped
==> Extracting sources...
  -> Creating working copy of Papilio-Loader git repo...
Cloning into 'Papilio-Loader'...
done.
==> Starting build()...
Generating build system...
configure.ac:8: installing './compile'
configure.ac:4: installing './install-sh'
configure.ac:4: installing './missing'
Makefile.am: installing './depcomp'
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /usr/bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking for g++... g++
checking whether the C++ compiler works... yes
checking for C++ compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
checking for style of include used by make... GNU
checking dependency style of g++... gcc3
checking for gcc... gcc
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ISO C89... none needed
checking whether gcc understands -c and -o together... yes
checking dependency style of gcc... gcc3
checking how to run the C preprocessor... gcc -E
checking whether ln -s works... yes
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking for libftdi1... no
configure: error: Package requirements (libftdi >= 0.19) were not met:

No package 'libftdi' found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables libftdi1_CFLAGS
and libftdi1_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.
==> ERROR: A failure occurred in build().
    Aborting...