Can you add the patch as regular source? And it would also make sense to use prepare() for patching.

The make dependency unzip (required by autogen.sh) is missing.

/startdir/PKGBUILD: line 23: i686-w64-mingw32-configure: command not found

Hello, here's an updated PKGBUILD: # Maintainer: Benoit Favre <benoit.favre@gmail.com> pkgname=('mingw-w64-protobuf') _pkgname=protobuf pkgver=3.2.0 pkgrel=1 pkgdesc="Protocol Buffers - Google's data interchange format (mingw-w64)" arch=('any') url='https://developers.google.com/protocol-buffers/' license=('BSD') depends=('mingw-w64-crt' 'mingw-w64-zlib') makedepends=('mingw-w64-gcc' 'protobuf') options=(!strip !buildflags staticlibs) source=("https://github.com/google/protobuf/releases/download/v${pkgver}/protobuf-cpp-${pkgver}.tar.gz") md5sums=('46ab34b63ac77c02d4351961f6f85ded') _architectures="i686-w64-mingw32 x86_64-w64-mingw32" build() { cd ${srcdir}/${_pkgname}-${pkgver} for _arch in ${_architectures}; do mkdir -p build-${_arch} && pushd build-${_arch} ${_arch}-configure --with-protoc=/usr/bin/protoc .. make popd done } package() { for _arch in ${_architectures}; do cd "${srcdir}"/${_pkgname}-${pkgver}/build-${_arch} make DESTDIR="$pkgdir" install rm "${pkgdir}"/usr/${_arch}/bin/*.exe ${_arch}-strip --strip-unneeded "$pkgdir"/usr/${_arch}/bin/*.dll ${_arch}-strip -g "$pkgdir"/usr/${_arch}/lib/*.a done }

Not sure why the license file is necessary, considering most if not all of those who use this also have the native package, which already has it.