Hello,

there is a build failure in json-c:

$ guix environment -s armhf-linux --pure u-boot-a20-olinuxino-micro
[...]
running 'cmake' with arguments ("../json-c-0.14" "-DCMAKE_BUILD_TYPE=RelWithDebInfo" "-DCMAKE_INSTALL_PREFIX=/gnu/store/yqaw63n8wmg7f2ncc24019z87m5cwhim-json-c-0.14" "-DCMAKE_INSTALL_LIBDIR=lib" "-DCMAKE_INSTALL_RPATH_USE_LINK_PATH=TRUE" "-DCMAKE_INSTALL_RPATH=/gnu/store/yqaw63n8wmg7f2ncc24019z87m5cwhim-json-c-0.14/lib" "-DCMAKE_VERBOSE_MAKEFILE=ON")
CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
  list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPILER_ID_WRITE)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILER_ID_BUILD)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILER_ID)
  CMakeLists.txt:10 (project)


CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
  list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPILER_ID_WRITE)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILER_ID_BUILD)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILER_ID)
  CMakeLists.txt:10 (project)


CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
  list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPILER_ID_WRITE)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILER_ID_BUILD)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILER_ID)
  CMakeLists.txt:10 (project)


CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
  list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPILER_ID_WRITE)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILER_ID_BUILD)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILER_ID)
  CMakeLists.txt:10 (project)


CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
  list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPILER_ID_WRITE)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILER_ID_BUILD)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILER_ID)
  CMakeLists.txt:10 (project)


CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
  list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPILER_ID_WRITE)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILER_ID_BUILD)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILER_ID)
  CMakeLists.txt:10 (project)


CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
  list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPILER_ID_WRITE)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILER_ID_BUILD)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILER_ID)
  CMakeLists.txt:10 (project)


CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
  list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPILER_ID_WRITE)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILER_ID_BUILD)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILER_ID)
  CMakeLists.txt:10 (project)


CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
  list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPILER_ID_WRITE)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILER_ID_BUILD)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILER_ID)
  CMakeLists.txt:10 (project)


CMake Error at /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeCompilerIdDetection.cmake:26 (list):
  list sub-command REMOVE_ITEM requires two or more arguments.
Call Stack (most recent call first):
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:211 (compiler_id_detection)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:230 (CMAKE_DETERMINE_COMPILER_ID_WRITE)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCompilerId.cmake:32 (CMAKE_DETERMINE_COMPILER_ID_BUILD)
  /gnu/store/8aamffn0azz4jx4m18pzw4k14sr437ly-cmake-minimal-3.16.5/share/cmake-3.16/Modules/CMakeDetermineCCompiler.cmake:116 (CMAKE_DETERMINE_COMPILER_ID)
  CMakeLists.txt:10 (project)

-- The C compiler identification is unknown
[...]
-- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE) 
Warning: doxygen not found, the 'doc' target will not be included
-- Configuring incomplete, errors occurred!
See also "/tmp/guix-build-json-c-0.14.drv-0/build/CMakeFiles/CMakeOutput.log".
See also "/tmp/guix-build-json-c-0.14.drv-0/build/CMakeFiles/CMakeError.log".
command "cmake" "../json-c-0.14" "-DCMAKE_BUILD_TYPE=RelWithDebInfo" "-DCMAKE_INSTALL_PREFIX=/gnu/store/yqaw63n8wmg7f2ncc24019z87m5cwhim-json-c-0.14" "-DCMAKE_INSTALL_LIBDIR=lib" "-DCMAKE_INSTALL_RPATH_USE_LINK_PATH=TRUE" "-DCMAKE_INSTALL_RPATH=/gnu/store/yqaw63n8wmg7f2ncc24019z87m5cwhim-json-c-0.14/lib" "-DCMAKE_VERBOSE_MAKEFILE=ON" failed with status 1

Compiling the C compiler identification source file "CMakeCCompilerId.c" failed.
Compiler: /gnu/store/z8954h4nvgxwcyy2in8c1l11g199m2yb-gcc-7.5.0/bin/gcc 
Build flags: 
Id flags:  

The output was:
1
CMakeCCompilerId.c:20:52: error: expected ‘,’ or ‘;’ before ‘COMPILER_ID’
 char const* info_compiler = "INFO" ":" "compiler[" COMPILER_ID "]";
                                                    ^~~~~~~~~~~

[...]

Furthermore, I'd like to ask: Why is json-c a dependency in the first place ?

$ LC_ALL=C guix describe
Generation 124  Sep 18 2020 22:27:08    (current)
  guix e6ba735
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: e6ba735d685886e747a831e43a501488e15d97c7
  heads 50b97d4
    repository URL: https://github.com/daym/heads-guix.git
    branch: wip-musl
    commit: 50b97d446ebafd0be7a0e19d87cd236882093244