Weird build errors on Linux

[AdamantGarth]

Hi, tried to build this on Arch Linux by following the readme, and got some weird errors:

$ cmake -DUBUS_SUPPORT=OFF -DUCI_SUPPORT=OFF -DULOOP_SUPPORT=OFF .
-- The C compiler identification is GNU 12.2.1
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Found PkgConfig: /usr/bin/pkg-config (found version "1.8.0")
-- Checking for module 'json-c'
--   Found json-c, version 0.16
-- Looking for dlopen
-- Looking for dlopen - found
-- Looking for fmod
-- Looking for fmod - not found
-- Looking for json_tokener_get_parse_end
-- Looking for json_tokener_get_parse_end - found
-- Looking for json_object_new_array_ext
-- Looking for json_object_new_array_ext - found
-- Looking for json_object_new_uint64
-- Looking for json_object_new_uint64 - found
-- Looking for ceil
-- Looking for ceil - not found
-- Looking for res_mkquery
-- Looking for res_mkquery - found
-- Looking for clock_gettime
-- Looking for clock_gettime - found
-- Looking for frexp
-- Looking for frexp - found
-- Configuring done
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
nl
    linked by target "rtnl_lib" in directory /home/user/Src/ucode
    linked by target "nl80211_lib" in directory /home/user/Src/ucode
nl_include_dir
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
   used as include directory in directory /home/user/Src/ucode/examples
ubox
    linked by target "nl80211_lib" in directory /home/user/Src/ucode

CMake Error in CMakeLists.txt:
  Found relative path while evaluating include directories of "libucode":

    "nl_include_dir-NOTFOUND"



CMake Error in CMakeLists.txt:
  Found relative path while evaluating include directories of "ucode":

    "nl_include_dir-NOTFOUND"



CMake Error in CMakeLists.txt:
  Found relative path while evaluating include directories of "fs_lib":

    "nl_include_dir-NOTFOUND"



CMake Error in CMakeLists.txt:
  Found relative path while evaluating include directories of "math_lib":

    "nl_include_dir-NOTFOUND"



CMake Error in CMakeLists.txt:
  Found relative path while evaluating include directories of "rtnl_lib":

    "nl_include_dir-NOTFOUND"



CMake Error in CMakeLists.txt:
  Found relative path while evaluating include directories of "nl80211_lib":

    "nl_include_dir-NOTFOUND"



CMake Error in CMakeLists.txt:
  Found relative path while evaluating include directories of "resolv_lib":

    "nl_include_dir-NOTFOUND"



CMake Error in CMakeLists.txt:
  Found relative path while evaluating include directories of "struct_lib":

    "nl_include_dir-NOTFOUND"



CMake Error in examples/CMakeLists.txt:
  Found relative path while evaluating include directories of
  "exception-handler":

    "nl_include_dir-NOTFOUND"



CMake Error in examples/CMakeLists.txt:
  Found relative path while evaluating include directories of "execute-file":

    "nl_include_dir-NOTFOUND"



CMake Error in examples/CMakeLists.txt:
  Found relative path while evaluating include directories of
  "execute-string":

    "nl_include_dir-NOTFOUND"



CMake Error in examples/CMakeLists.txt:
  Found relative path while evaluating include directories of
  "native-function":

    "nl_include_dir-NOTFOUND"



CMake Error in examples/CMakeLists.txt:
  Found relative path while evaluating include directories of "state-reset":

    "nl_include_dir-NOTFOUND"



CMake Error in examples/CMakeLists.txt:
  Found relative path while evaluating include directories of "state-reuse":

    "nl_include_dir-NOTFOUND"



-- Generating done
CMake Generate step failed.  Build files cannot be regenerated correctly.

Running make also seemingly fails:

$ make
[  2%] Building C object CMakeFiles/libucode.dir/lexer.c.o
[  5%] Building C object CMakeFiles/libucode.dir/lib.c.o
[  8%] Building C object CMakeFiles/libucode.dir/vm.c.o
[ 11%] Building C object CMakeFiles/libucode.dir/chunk.c.o
[ 13%] Building C object CMakeFiles/libucode.dir/vallist.c.o
[ 16%] Building C object CMakeFiles/libucode.dir/compiler.c.o
[ 19%] Building C object CMakeFiles/libucode.dir/source.c.o
[ 22%] Building C object CMakeFiles/libucode.dir/types.c.o
[ 25%] Building C object CMakeFiles/libucode.dir/program.c.o
[ 27%] Linking C shared library libucode.so
[ 27%] Built target libucode
[ 30%] Building C object CMakeFiles/ucode.dir/main.c.o
[ 33%] Linking C executable ucode
[ 33%] Built target ucode
[ 36%] Building C object CMakeFiles/fs_lib.dir/lib/fs.c.o
[ 38%] Linking C shared module fs.so
[ 38%] Built target fs_lib
[ 41%] Building C object CMakeFiles/math_lib.dir/lib/math.c.o
[ 44%] Linking C shared module math.so
[ 44%] Built target math_lib
[ 47%] Building C object CMakeFiles/rtnl_lib.dir/lib/rtnl.c.o
/home/user/Src/ucode/lib/rtnl.c:31:10: fatal error: netlink/msg.h: No such file or directory
   31 | #include <netlink/msg.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
make[2]: *** [CMakeFiles/rtnl_lib.dir/build.make:76: CMakeFiles/rtnl_lib.dir/lib/rtnl.c.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:232: CMakeFiles/rtnl_lib.dir/all] Error 2
make: *** [Makefile:136: all] Error 2

But despite that, there's ucode binary, and it seems to work fine:

$ ./ucode -e 'print("OK!\n")'
OK!

[ynezz]

cmake -DUBUS_SUPPORT=OFF -DUCI_SUPPORT=OFF -DULOOP_SUPPORT=OFF .

You should add -D NL80211_SUPPORT=OFF into your cmake args if you don't need nl80211 library in ucode.

[AdamantGarth]

Yep, cmake -DUBUS_SUPPORT=OFF -DUCI_SUPPORT=OFF -DULOOP_SUPPORT=OFF -DNL80211_SUPPORT=OFF -DRTNL_SUPPORT=OFF . did it, thanks!

Maybe it's worth adding these extra options to the Linux build instructions in the readme? Those libraries sound like something OpenWRT-specific.