target pattern contains no `%'. Stop.

[SamuelMarks]

Running CMake 3.19.7 on macOS 11.1 (20C69). Have LLVM @ 4224a3 in the directory above which I built using CMake.

$ git clone https://github.com/firolino/clang-tool
cd clang-tool
mkdir build
cd build
cmake ..
make
Cloning into 'clang-tool'...
remote: Enumerating objects: 9, done.
remote: Counting objects: 100% (9/9), done.
remote: Compressing objects: 100% (9/9), done.
remote: Total 196 (delta 1), reused 3 (delta 0), pack-reused 187
Receiving objects: 100% (196/196), 28.97 KiB | 5.79 MiB/s, done.
Resolving deltas: 100% (93/93), done.
CMake Deprecation Warning at CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


-- The C compiler identification is AppleClang 12.0.0.12000032
-- The CXX compiler identification is AppleClang 12.0.0.12000032
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Deprecation Warning at src/CMakeLists.txt:1 (cmake_minimum_required):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

  Update the VERSION argument <min> value or use a ...<max> suffix to tell
  CMake that the project does not need compatibility with older versions.


-- LLVM CXX flags: /bin/sh: LLVM_CONFIG_EXECUTABLE-NOTFOUND: command not found
-- LLVM LD flags:  
-- LLVM core libs: /bin/sh: LLVM_CONFIG_EXECUTABLE-NOTFOUND: command not found
-- Found LLVM: /bin/sh: LLVM_CONFIG_EXECUTABLE-NOTFOUND: command not found
-- Clang libs: 
-- Configuring done
-- Generating done
-- Build files have been written to: /muh/dir/fold/clang-llvm/clang-tool/build
src/CMakeFiles/clang-tool.dir/build.make:206: *** target pattern contains no `%'.  Stop.
make[1]: *** [src/CMakeFiles/clang-tool.dir/all] Error 2
make: *** [all] Error 2