Error installing mini_racer v0.19.0 on darwin platform

[afdev82]

I am trying to install mini_racer v0.19.0 on a MacBook Pro and I am getting the following error:

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/mini_racer-0.19.0/ext/mini_racer_extension
/Users/antonio.facciolo/.rbenv/versions/3.4.4/bin/ruby extconf.rb
checking for -lpthread... yes
checking for -lobjc... yes
checking for whether -Wl,--exclude-libs=ALL  is accepted as LDFLAGS... no
creating Makefile

current directory: /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/mini_racer-0.19.0/ext/mini_racer_extension
make DESTDIR\= sitearchdir\=./.gem.20250716-48170-u24r96 sitelibdir\=./.gem.20250716-48170-u24r96 clean

current directory: /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/mini_racer-0.19.0/ext/mini_racer_extension
make DESTDIR\= sitearchdir\=./.gem.20250716-48170-u24r96 sitelibdir\=./.gem.20250716-48170-u24r96
compiling mini_racer_extension.c
In file included from mini_racer_extension.c:13:
./serde.c:101:27: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'uint32_t' (aka 'unsigned int') [-Wshorten-64-to-32]
    n = next_power_of_two(n);
        ~~~~~~~~~~~~~~~~~ ^
./serde.c:111:14: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'uint32_t' (aka 'unsigned int') [-Wshorten-64-to-32]
    b->cap = n;
           ~ ^
./serde.c:398:29: warning: implicit conversion loses integer precision: 'uint64_t' (aka 'unsigned long long') to 'uint32_t' (aka 'unsigned int') [-Wshorten-64-to-32]
        des_object_ref(arg, u);
        ~~~~~~~~~~~~~~      ^
./serde.c:572:33: warning: implicit conversion loses integer precision: 'unsigned long long' to 'int' [-Wshorten-64-to-32]
        des_bigint(arg, *p, u, 1-2*t);
        ~~~~~~~~~~             ~^~~~
mini_racer_extension.c:610:23: warning: incompatible pointer types passing 'unsigned long[64]' to parameter of type 'const uint64_t *' (aka 'const unsigned long long *')
[-Wincompatible-pointer-types]
        ser_bigint(s, limbs, countof(limbs), sign);
                      ^~~~~
./serde.c:243:48: note: passing argument to parameter 'p' here
static void ser_bigint(Ser *s, const uint64_t *p, size_t n, int sign)
                                               ^
mini_racer_extension.c:535:32: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'uint32_t' (aka 'unsigned int')
[-Wshorten-64-to-32]
            ser_array_begin(s, n);
            ~~~~~~~~~~~~~~~    ^
mini_racer_extension.c:539:30: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'uint32_t' (aka 'unsigned int')
[-Wshorten-64-to-32]
            ser_array_end(s, n);
            ~~~~~~~~~~~~~    ^
mini_racer_extension.c:541:31: warning: implicit conversion loses integer precision: 'long' to 'uint32_t' (aka 'unsigned int') [-Wshorten-64-to-32]
            ser_object_ref(s, FIX2LONG(id));
            ~~~~~~~~~~~~~~    ^~~~~~~~~~~~
/Users/antonio.facciolo/.rbenv/versions/3.4.4/include/ruby-3.4.0/ruby/internal/arithmetic/long.h:46:22: note: expanded from macro 'FIX2LONG'
#define FIX2LONG     RB_FIX2LONG          /**< @old{RB_FIX2LONG} */
                     ^
/Users/antonio.facciolo/.rbenv/versions/3.4.4/include/ruby-3.4.0/ruby/internal/arithmetic/long.h:53:22: note: expanded from macro 'RB_FIX2LONG'
#define RB_FIX2LONG  rb_fix2long          /**< @alias{rb_fix2long} */
                     ^
mini_racer_extension.c:570:35: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'uint32_t' (aka 'unsigned int')
[-Wshorten-64-to-32]
                ser_object_end(s, n);
                ~~~~~~~~~~~~~~    ^
mini_racer_extension.c:575:31: warning: implicit conversion loses integer precision: 'long' to 'uint32_t' (aka 'unsigned int') [-Wshorten-64-to-32]
            ser_object_ref(s, FIX2LONG(id));
            ~~~~~~~~~~~~~~    ^~~~~~~~~~~~
/Users/antonio.facciolo/.rbenv/versions/3.4.4/include/ruby-3.4.0/ruby/internal/arithmetic/long.h:46:22: note: expanded from macro 'FIX2LONG'
#define FIX2LONG     RB_FIX2LONG          /**< @old{RB_FIX2LONG} */
                     ^
/Users/antonio.facciolo/.rbenv/versions/3.4.4/include/ruby-3.4.0/ruby/internal/arithmetic/long.h:53:22: note: expanded from macro 'RB_FIX2LONG'
#define RB_FIX2LONG  rb_fix2long          /**< @alias{rb_fix2long} */
                     ^
mini_racer_extension.c:690:31: warning: implicit conversion loses integer precision: 'int64_t' (aka 'long long') to 'int' [-Wshorten-64-to-32]
    deadline = deadline_ms(c->timeout);
               ~~~~~~~~~~~ ~~~^~~~~~~
mini_racer_extension.c:771:43: warning: implicit conversion loses integer precision: 'int64_t' (aka 'long long') to 'int' [-Wshorten-64-to-32]
                deadline = deadline_ms(c->idle_gc);
                           ~~~~~~~~~~~ ~~~^~~~~~~
12 warnings generated.
compiling mini_racer_v8.cc
clang: warning: argument unused during compilation: '-rdynamic' [-Wunused-command-line-argument]
In file included from mini_racer_v8.cc:1:
In file included from /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8.h:24:
In file included from /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8-array-buffer.h:13:
/Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8-memory-span.h:45:36: error: no member named
'enable_view' in namespace 'std::ranges'
inline constexpr bool std::ranges::enable_view<v8::MemorySpan<T>> = true;
                      ~~~~~~~~~~~~~^
/Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8-memory-span.h:45:47: error: expected ';' at
end of declaration
inline constexpr bool std::ranges::enable_view<v8::MemorySpan<T>> = true;
                                              ^
                                              ;
/Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8-memory-span.h:45:47: error: expected
unqualified-id
In file included from mini_racer_v8.cc:1:
In file included from /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8.h:24:
In file included from /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8-array-buffer.h:15:
In file included from /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8-platform.h:14:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/string:532:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/string_view:191:
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/__ranges/enable_view.h:32:23: error: redefinition of 'enable_view'
inline constexpr bool enable_view = derived_from<_Tp, view_base>;
                      ^
/Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8-memory-span.h:45:36: note: previous
definition is here
inline constexpr bool std::ranges::enable_view<v8::MemorySpan<T>> = true;
                                   ^
4 errors generated.
make: *** [mini_racer_v8.o] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/mini_racer-0.19.0 for inspection.
Results logged to /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/extensions/x86_64-darwin-21/3.4.0/mini_racer-0.19.0/gem_make.out

  /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/3.4.0/rubygems/ext/builder.rb:126:in 'Gem::Ext::Builder.run'
  /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/3.4.0/rubygems/ext/builder.rb:52:in 'block in Gem::Ext::Builder.make'
  /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/3.4.0/rubygems/ext/builder.rb:44:in 'Array#each'
  /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/3.4.0/rubygems/ext/builder.rb:44:in 'Gem::Ext::Builder.make'
  /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/3.4.0/rubygems/ext/ext_conf_builder.rb:44:in 'Gem::Ext::ExtConfBuilder.build'
  /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/3.4.0/rubygems/ext/builder.rb:195:in 'Gem::Ext::Builder#build_extension'
  /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/3.4.0/rubygems/ext/builder.rb:229:in 'block in Gem::Ext::Builder#build_extensions'
  /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/3.4.0/rubygems/ext/builder.rb:226:in 'Array#each'
  /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/3.4.0/rubygems/ext/builder.rb:226:in 'Gem::Ext::Builder#build_extensions'
  /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/3.4.0/rubygems/installer.rb:844:in 'Gem::Installer#build_extensions'
/Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/rubygems_gem_installer.rb:111:in
'Bundler::RubyGemsGemInstaller#build_extensions'
/Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/rubygems_gem_installer.rb:30:in
'Bundler::RubyGemsGemInstaller#install'
  /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/source/rubygems.rb:220:in 'Bundler::Source::Rubygems#install'
  /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/installer/gem_installer.rb:55:in 'Bundler::GemInstaller#install'
/Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/installer/gem_installer.rb:17:in
'Bundler::GemInstaller#install_from_spec'
/Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/installer/parallel_installer.rb:133:in
'Bundler::ParallelInstaller#do_install'
/Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/installer/parallel_installer.rb:124:in 'block in
Bundler::ParallelInstaller#worker_pool'
  /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/worker.rb:62:in 'Bundler::Worker#apply_func'
  /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/worker.rb:57:in 'block in Bundler::Worker#process_queue'
  <internal:kernel>:168:in 'Kernel#loop'
  /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/worker.rb:54:in 'Bundler::Worker#process_queue'
  /Users/antonio.facciolo/.rbenv/versions/3.4.4/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/worker.rb:90:in 'block (2 levels) in Bundler::Worker#create_threads'

An error occurred while installing mini_racer (0.19.0), and Bundler cannot continue.

In Gemfile:
  mini_racer

MacOSX 12.7.6
Darwin 21.6.0
Ruby 3.4.4 (also tried with 3.4.5)
Bundler 2.6.9 (also tried with 2.7.0)
Rubygems v3.6.7

I have already asked ChatGPT:

This line shows the root issue:

error: no member named 'enable_view' in namespace 'std::ranges'

This means:

The C++ headers shipped with your system (macOS Command Line Tools) already define enable_view in std::ranges.

But the libv8-node vendored by mini_racer tries to define it again, which leads to a conflict.

This is due to:

Newer versions of the macOS Clang toolchain already having full support for C++20 ranges.

But libv8-node (vendored V8 engine) assuming an older compiler.

The suggested solutions were to downgrade ruby (I don't want to), use precompiled libv8-node and patch libv8-node.
I have tried to use a precompiled libv8-node with the following command

gem install libv8-node -v '24.1.0.0' --platform ruby

but the installation failed as well with the same error (because in fact that's the problem I think). It tried to compile it anyway.

Mini_racer v0.18.1 was working fine.
It's not a big deal for me, I will stay with the previous version for the moment.
If someone could help to find out what's happening or I could solve the problem, many thanks in advance.

[tisba]

macOS 12 is Monterey which is a little dated and not covered by our CI (because not supported by Github, also unsupported by Apple since last year IIRC).

From what I can tell, the problem is compiling mini_racer and not installing libv8-node. Don't trust text generators, gem install with --platform ruby will not use the precompiled version. Also libv8-node is not vendored by mini_racer as well… 🙄

I don't have a x86 Mac around anymore and cannot reproduce. I'm not sure if we require a minimum macOS version.

Can you give us your gcc --version?

[afdev82]

Don't trust text generators

Yes, I don't trust them 😆 it was only to have a possible hint.

$ gcc --version
Apple clang version 14.0.0 (clang-1400.0.29.202)
Target: x86_64-apple-darwin21.6.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

On Linux I have v13.3.0 and it was working fine.

[gi]

I'm seeing the same thing on macOS Sequoia 15.5:

> ruby --version
ruby 3.4.5 (2025-07-16 revision 20cda200d3) +PRISM [arm64-darwin24]

> gcc --version
Apple clang version 17.0.0 (clang-1700.0.13.5)
Target: arm64-apple-darwin24.5.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin

[tisba]

This is really interesting. 0.19.0 builds just fine for me (Ruby 3.4.5), same gcc --version as @gi, also on Sequoia 15.5… 🤔

[gi]

I have been trying to compile this project from source, and after making the changes in #361 to fix the typing issues, the Makefile that Ruby is generating is setting CXX = false.

If mkmf fails to detect a functional C++ compiler during the extconf.rb (extension configuration) process, it will set the CXX variable in the generated makefile to "false" or equivalent. This might occur if:

• No C++ compiler is installed on the system.
• The C++ compiler is not in the system's search path.
• There are issues with the CXXFLAGS.

When I set CXX=clang++, I now get

In file included from ../../../../ext/mini_racer_extension/mini_racer_v8.cc:1:
/Users/zach.gianos/.local/share/asdf/installs/ruby/3.4.5/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-arm64-darwin/vendor/v8/include/v8.h:21:10: fatal error: 'memory' file not found
   21 | #include <memory>

Why is CXX set to false?
Why is memory lib not found?

---

It seems that something is weird with my installation: ruby -rrbconfig -e 'puts RbConfig::CONFIG["CXX"]' outputs false.

---

It seems that an OS upgrade broke my XCode Command Line Tools, such that Ruby Build could not find the C++ compiler. I had to remove and reinstall XC CLT and rebuild Ruby.

I still received the compiler errors on main, but with the changes in #361, I was able to successfully build & test.

[gi]

@afdev82 can you confirm that the changes made in the associated pull request fixes your compilation issues?

[afdev82]

@gi the warnings are gone, but I am still getting the errors:

Fetching https://github.com/rubyjs/mini_racer.git
Fetching gem metadata from https://rubygems.org/........
Resolving dependencies...
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/bundler/gems/mini_racer-a3d5e90b4050/ext/mini_racer_extension
/Users/antonio.facciolo/.rbenv/versions/3.4.5/bin/ruby extconf.rb
checking for -lpthread... yes
checking for -lobjc... yes
checking for whether -Wl,--exclude-libs=ALL  is accepted as LDFLAGS... no
creating Makefile

current directory: /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/bundler/gems/mini_racer-a3d5e90b4050/ext/mini_racer_extension
make DESTDIR\= sitearchdir\=./.gem.20250728-17953-52wra sitelibdir\=./.gem.20250728-17953-52wra clean

current directory: /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/bundler/gems/mini_racer-a3d5e90b4050/ext/mini_racer_extension
make DESTDIR\= sitearchdir\=./.gem.20250728-17953-52wra sitelibdir\=./.gem.20250728-17953-52wra
compiling mini_racer_extension.c
compiling mini_racer_v8.cc
clang: warning: argument unused during compilation: '-rdynamic' [-Wunused-command-line-argument]
In file included from mini_racer_v8.cc:1:
In file included from /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8.h:24:
In file included from /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8-array-buffer.h:13:
/Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8-memory-span.h:45:36: error: no member named 'enable_view' in
namespace 'std::ranges'
inline constexpr bool std::ranges::enable_view<v8::MemorySpan<T>> = true;
                      ~~~~~~~~~~~~~^
/Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8-memory-span.h:45:47: error: expected ';' at end of declaration
inline constexpr bool std::ranges::enable_view<v8::MemorySpan<T>> = true;
                                              ^
                                              ;
/Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8-memory-span.h:45:47: error: expected unqualified-id
In file included from mini_racer_v8.cc:1:
In file included from /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8.h:24:
In file included from /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8-array-buffer.h:15:
In file included from /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8-platform.h:14:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/string:532:
In file included from /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/string_view:191:
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/c++/v1/__ranges/enable_view.h:32:23: error: redefinition of 'enable_view'
inline constexpr bool enable_view = derived_from<_Tp, view_base>;
                      ^
/Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/libv8-node-24.1.0.0-x86_64-darwin/vendor/v8/include/v8-memory-span.h:45:36: note: previous definition is here
inline constexpr bool std::ranges::enable_view<v8::MemorySpan<T>> = true;
                                   ^
4 errors generated.
make: *** [mini_racer_v8.o] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/bundler/gems/mini_racer-a3d5e90b4050 for inspection.
Results logged to /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/bundler/gems/extensions/x86_64-darwin-21/3.4.0/mini_racer-a3d5e90b4050/gem_make.out

  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/site_ruby/3.4.0/rubygems/ext/builder.rb:125:in 'Gem::Ext::Builder.run'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/site_ruby/3.4.0/rubygems/ext/builder.rb:51:in 'block in Gem::Ext::Builder.make'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/site_ruby/3.4.0/rubygems/ext/builder.rb:43:in 'Array#each'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/site_ruby/3.4.0/rubygems/ext/builder.rb:43:in 'Gem::Ext::Builder.make'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/site_ruby/3.4.0/rubygems/ext/ext_conf_builder.rb:44:in 'Gem::Ext::ExtConfBuilder.build'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/site_ruby/3.4.0/rubygems/ext/builder.rb:206:in 'Gem::Ext::Builder#build_extension'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/site_ruby/3.4.0/rubygems/ext/builder.rb:240:in 'block in Gem::Ext::Builder#build_extensions'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/site_ruby/3.4.0/rubygems/ext/builder.rb:237:in 'Array#each'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/site_ruby/3.4.0/rubygems/ext/builder.rb:237:in 'Gem::Ext::Builder#build_extensions'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/site_ruby/3.4.0/rubygems/installer.rb:842:in 'Gem::Installer#build_extensions'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/rubygems_gem_installer.rb:111:in 'Bundler::RubyGemsGemInstaller#build_extensions'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/source/path/installer.rb:28:in 'Bundler::Source::Path::Installer#post_install'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/source/path.rb:234:in 'Bundler::Source::Path#generate_bin'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/source/git.rb:212:in 'Bundler::Source::Git#install'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/installer/gem_installer.rb:55:in 'Bundler::GemInstaller#install'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/installer/gem_installer.rb:17:in 'Bundler::GemInstaller#install_from_spec'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/installer/parallel_installer.rb:133:in 'Bundler::ParallelInstaller#do_install'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/installer/parallel_installer.rb:124:in 'block in Bundler::ParallelInstaller#worker_pool'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/worker.rb:62:in 'Bundler::Worker#apply_func'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/worker.rb:57:in 'block in Bundler::Worker#process_queue'
  <internal:kernel>:168:in 'Kernel#loop'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/worker.rb:54:in 'Bundler::Worker#process_queue'
  /Users/antonio.facciolo/.rbenv/versions/3.4.5/lib/ruby/gems/3.4.0/gems/bundler-2.6.9/lib/bundler/worker.rb:90:in 'block (2 levels) in Bundler::Worker#create_threads'

An error occurred while installing mini_racer (0.19.0), and Bundler cannot continue.

In Gemfile:
  mini_racer

[afdev82]

At the moment, I have "solved" in this way:

if RUBY_PLATFORM.include?('x86_64-darwin21')
  gem 'mini_racer', '0.18.1'
else
  gem 'mini_racer', '0.19.0', platforms: :ruby
end

That is to say, downgrading mini_racer in case of my platform.