Fails to install on ubuntu 20.04.2 LTS with ruby installed via snap, no useful info in mkmf.log

[inspire22]

Any help is appreciated, been banging my head against this all day.

Linux sidekiq2 5.15.0-67-generic #74-Ubuntu SMP Wed Feb 22 14:14:39 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

Tried both with and without --enable-system-libffi

Libffi is installed via apt & some versions of ffi but there's a lot of options, not sure if a specific one is required.

Ubuntu system tools & gcc/etc are all installed.

gem install ffi -- --enable-system-libffi
Building native extensions with: '--enable-system-libffi'
This could take a while...
ERROR:  Error installing ffi:
        ERROR: Failed to build gem native extension.

    current directory: /root/.gem/gems/ffi-1.15.5/ext/ffi_c
/snap/bin/ruby extconf.rb --enable-system-libffi
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=/snap/ruby/317/bin/$(RUBY_BASE_NAME)
        --with-ffi_c-dir
        --without-ffi_c-dir
        --with-ffi_c-include
        --without-ffi_c-include=${ffi_c-dir}/include
        --with-ffi_c-lib
        --without-ffi_c-lib=${ffi_c-dir}/lib
        --enable-system-libffi
        --with-libffi-dir
        --without-libffi-dir
        --with-libffi-include
        --without-libffi-include=${libffi-dir}/include
        --with-libffi-lib
        --without-libffi-lib=${libffi-dir}/lib
        --with-libffi-config
        --without-libffi-config
        --with-pkg-config
        --without-pkg-config
/snap/ruby/317/lib/ruby/3.2.0/mkmf.rb:490:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.

        from /snap/ruby/317/lib/ruby/3.2.0/mkmf.rb:583:in `try_link0'
        from /snap/ruby/317/lib/ruby/3.2.0/mkmf.rb:601:in `try_link'
        from /snap/ruby/317/lib/ruby/3.2.0/mkmf.rb:693:in `try_ldflags'
        from /snap/ruby/317/lib/ruby/3.2.0/mkmf.rb:1891:in `pkg_config'
        from extconf.rb:9:in `system_libffi_usable?'
        from extconf.rb:44:in `<main>'

mkmf.log:

LD_LIBRARY_PATH=.:/snap/ruby/317/lib pkg-config --exists libffi
LD_LIBRARY_PATH=.:/snap/ruby/317/lib pkg-config --libs libffi |
=> "-lffi\n"
LD_LIBRARY_PATH=.:/snap/ruby/317/lib "gcc -o conftest -I/snap/ruby/317/include/ruby-3.2.0/x86_64-linux -I/snap/ruby/317/include/ruby-3.2.0/ruby/backward -I/snap/ruby/317/include/ruby-3.2.0 -I.    -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wdeprecated-declarations -Wdiv-by-zero -Wduplicated-cond -Wimplicit-function-declaration -Wimplicit-int -Wmisleading-indentation -Wpointer-arith -Wwrite-strings -Wold-style-definition -Wimplicit-fallthrough=0 -Wmissing-noreturn -Wno-cast-function-type -Wno-constant-logical-operand -Wno-long-long -Wno-missing-field-initializers -Wno-overlength-strings -Wno-packed-bitfield-compat -Wno-parentheses-equality -Wno-self-assign -Wno-tautological-compare -Wno-unused-parameter -Wno-unused-value -Wsuggest-attribute=format -Wsuggest-attribute=noreturn -Wunused-variable -Wundef  -fPIC conftest.c  -L. -L/snap/ruby/317/lib -Wl,-rpath,/snap/ruby/317/lib -L. -L/build/snapcraft-ruby-2c41636617a6ccb92a530f6f568ec82e/parts/ruby/install/usr/lib -L/build/snapcraft-ruby-2c41636617a6ccb92a530f6f568ec82e/parts/ruby/install/usr/lib/x86_64-linux-gnu -fstack-protector-strong -rdynamic -Wl,-export-dynamic -Wl,--no-as-needed     -Wl,-rpath,/snap/ruby/317/lib -L/snap/ruby/317/lib -lruby  -lm -lpthread  -lc"
/usr/bin/ld: /snap/core20/current/lib/x86_64-linux-gnu/libdl.so.2: undefined reference to `_dl_sym@GLIBC_PRIVATE'
/usr/bin/ld: /snap/core20/current/lib/x86_64-linux-gnu/libpthread.so.0: undefined reference to `__libc_dlclose@GLIBC_PRIVATE'
/usr/bin/ld: /snap/core20/current/lib/x86_64-linux-gnu/libpthread.so.0: undefined reference to `__libc_allocate_rtsig_private@GLIBC_PRIVATE'
/usr/bin/ld: /snap/core20/current/lib/x86_64-linux-gnu/librt.so.1: undefined reference to `__libc_dlsym@GLIBC_PRIVATE'
/usr/bin/ld: /snap/core20/current/lib/x86_64-linux-gnu/libpthread.so.0: undefined reference to `__libc_siglongjmp@GLIBC_PRIVATE'
/usr/bin/ld: /snap/core20/current/lib/x86_64-linux-gnu/libpthread.so.0: undefined reference to `__libc_thread_freeres@GLIBC_PRIVATE'
/usr/bin/ld: /snap/core20/current/lib/x86_64-linux-gnu/libpthread.so.0: undefined reference to `__libc_current_sigrtmax_private@GLIBC_PRIVATE'
/usr/bin/ld: /snap/core20/current/lib/x86_64-linux-gnu/libdl.so.2: undefined reference to `_dl_vsym@GLIBC_PRIVATE'
/usr/bin/ld: /snap/core20/current/lib/x86_64-linux-gnu/libpthread.so.0: undefined reference to `__libc_current_sigrtmin_private@GLIBC_PRIVATE'
/usr/bin/ld: /snap/core20/current/lib/x86_64-linux-gnu/libpthread.so.0: undefined reference to `_dl_make_stack_executable@GLIBC_PRIVATE'
/usr/bin/ld: /snap/core20/current/lib/x86_64-linux-gnu/libpthread.so.0: undefined reference to `__libc_longjmp@GLIBC_PRIVATE'
/usr/bin/ld: /snap/core20/current/lib/x86_64-linux-gnu/librt.so.1: undefined reference to `__libc_dlopen_mode@GLIBC_PRIVATE'
/usr/bin/ld: /snap/core20/current/lib/x86_64-linux-gnu/libdl.so.2: undefined reference to `_dl_addr@GLIBC_PRIVATE'
/usr/bin/ld: /snap/core20/current/lib/x86_64-linux-gnu/libpthread.so.0: undefined reference to `__libc_pthread_init@GLIBC_PRIVATE'
collect2: error: ld returned 1 exit status
checked program was:
/* begin */
1: #include "ruby.h"
2:
3: int main(int argc, char **argv)
4: {
5:   return !!argv[argc];
6: }
/* end */