autoreconf 'configure.ac' or 'configure.in' is required

Hi there
I am new to this forum.
I'm from Germany.
I hope I write my question in the right forum.

I want to create a snap package with the content kblocks.
If I want to create my snap package with this content, the following message comes autoreconf 'configure.ac' or 'configure.in' is required

I can't get any further here. Who can help?

My yaml file looks like this

Code:name: kblocks
version: "0.74-svn"
summary: kblocks
description: |
KBlocks is the classic falling blocks game
base: core18
confinement: devmode
parts:
kblocks:
plugin: autotools
source-type: git
source: https://github.com/KDE/kblocks.git
build-packages:
- g++
- make
- libsdl1.2-dev
- libpng-dev
- libsdl-net1.2-dev
- libsdl-sound1.2-dev
- libasound2-dev
stage-packages:
- libsdl-sound1.2
- libsdl-net1.2
- libxcursor1
- libxi6
- libxinerama1
- libxrandr2
- libxrender1
- libopenal1
- libsndio6.1
- libspeex1
- libvorbisfile3
- libwayland-client0
- libwayland-cursor0
- libwayland-egl1-mesa
- libxkbcommon0
- libglu1-mesa
- libasound2
- libasyncns0
- libbsd0
- libcaca0
- libdbus-1-3
- libflac8
- libgcc1
- libgcrypt20
- libgl1
- libglvnd0
- libglx0
- libgpg-error0
- liblz4-1
- liblzma5
- libncursesw5
- libogg0
- libpng16-16
- libpulse0
- libsdl1.2debian
- libslang2
- libsndfile1
- libstdc++6
- libsystemd0
- libtinfo5
- libvorbis0a
- libvorbisenc2
- libwrap0
- libx11-6
- libxau6
- libxcb1
- libxdmcp6
- libxext6
- zlib1g

apps:
kblocks:
command: kblocks
environment:
"LD_LIBRARY_PATH": "$SNAP/usr/lib/$SNAPCRAFT_ARCH_TRIPLET/pulseaudio"
"DISABLE_WAYLAND": "1"