Build dash_testnet: error: debian/rules build subprocess returned exit status 2

[Droppix]

Problem build on dash testnet

git clone https://github.com/trezor/blockbook.git
cd blockbook
make all-dash_testnet

Build Log

...
2020-06-22 09:09:43 (20.1 MB/s) - 'dashcore-0.15.0.0-x86_64-linux-gnu.tar.gz' saved [34190015/34190015]

wget https://github.com/dashpay/dash/releases/download/v0.15.0.0/dashcore-0.15.0.0-x86_64-linux-gnu.tar.gz.asc -O checksum
--2020-06-22 09:09:43--  https://github.com/dashpay/dash/releases/download/v0.15.0.0/dashcore-0.15.0.0-x86_64-linux-gnu.tar.gz.asc
Resolving github.com (github.com)... 140.82.118.4
Connecting to github.com (github.com)|140.82.118.4|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://github-production-release-asset-2e65be.s3.amazonaws.com/19352450/0607ec80-52f1-11ea-8bc9-63bb98bec05a?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20200622%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200622T090943Z&X-Amz-Expires=300&X-Amz-Signature=bf945de965486b27df2b3e28ce78ac5308154a47cc0b68ed9b94e17111a3bdb1&X-Amz-SignedHeaders=host&actor_id=0&repo_id=19352450&response-content-disposition=attachment%3B%20filename%3Ddashcore-0.15.0.0-x86_64-linux-gnu.tar.gz.asc&response-content-type=application%2Foctet-stream [following]
--2020-06-22 09:09:43--  https://github-production-release-asset-2e65be.s3.amazonaws.com/19352450/0607ec80-52f1-11ea-8bc9-63bb98bec05a?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIWNJYAX4CSVEH53A%2F20200622%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200622T090943Z&X-Amz-Expires=300&X-Amz-Signature=bf945de965486b27df2b3e28ce78ac5308154a47cc0b68ed9b94e17111a3bdb1&X-Amz-SignedHeaders=host&actor_id=0&repo_id=19352450&response-content-disposition=attachment%3B%20filename%3Ddashcore-0.15.0.0-x86_64-linux-gnu.tar.gz.asc&response-content-type=application%2Foctet-stream
Resolving github-production-release-asset-2e65be.s3.amazonaws.com (github-production-release-asset-2e65be.s3.amazonaws.com)... 52.217.41.244
Connecting to github-production-release-asset-2e65be.s3.amazonaws.com (github-production-release-asset-2e65be.s3.amazonaws.com)|52.217.41.244|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 833 [application/octet-stream]
Saving to: 'checksum'

checksum                                     100%[============================================================================================>]     833  --.-KB/s    in 0s

2020-06-22 09:09:44 (11.7 MB/s) - 'checksum' saved [833/833]

gpg --verify checksum
gpg: no signed data
gpg: can't hash datafile: No data
Makefile:4: recipe for target 'all' failed
make[1]: *** [all] Error 2
make[1]: Leaving directory '/build/build/pkg-defs/backend'
dh_auto_build: make -j1 returned exit code 2
debian/rules:6: recipe for target 'build' failed
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2
Makefile:34: recipe for target 'deb-dash_testnet' failed
make: *** [deb-dash_testnet] Error 2