Conda build ignoring meta.yml - build

Question

I am trying to create a conda package for a tool called SRecord.
With my own build environment things seem to work well.
But I wrote this meta.yml file:
package:
name: "srecord"
version: "1.62"
source:
url: https://sourceforge.net/projects/srecord/files/srecord/1.62/srecord-1.62.tar.gz
md5: c8afebd66c0b4cd2f317567b8e480310
build:
number: 0
requirements:
build:
- libboost-dev
- libgcrypt
- libtool
- make
- gcc
I also have this very quick build.sh script in the same folder:
#!/bin/bash
mkdir -p "${PREFIX}"
mkdir -p "${PREFIX}/bin"
mkdir -p "${PREFIX}/include"
mkdir -p "${PREFIX}/lib"
echo $PREFIX
echo $RECIPE_DIR
/bin/bash configure
make
cp -r bin/ "$PREFIX/bin/"
When I use conda-build name_of_folder/, I get this error message:
$ conda-build srecord/
Ignoring non-recipe: /home/dev1/Documents/conda_tutorial/srecord/meta.yml
Traceback (most recent call last):
File "/home/dev1/miniconda3/bin/conda-build", line 11, in <module>
sys.exit(main())
File "/home/dev1/miniconda3/lib/python3.9/site-packages/conda_build/cli/main_build.py", line 488, in main
execute(sys.argv[1:])
File "/home/dev1/miniconda3/lib/python3.9/site-packages/conda_build/cli/main_build.py", line 477, in execute
outputs = api.build(args.recipe, post=args.post, test_run_post=args.test_run_post,
File "/home/dev1/miniconda3/lib/python3.9/site-packages/conda_build/api.py", line 186, in build
return build_tree(
File "/home/dev1/miniconda3/lib/python3.9/site-packages/conda_build/build.py", line 3079, in build_tree
for (metadata, need_source_download, need_reparse_in_env) in metadata_tuples:
TypeError: cannot unpack non-iterable NoneType object
The example using conda skeleton works fine when using conda-build though...