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I'm stuck with install bson_ext gem with 1.5.1 version. I've tried almost everything what I found on web but nothing helps. I tried to reinstall ruby, rvm and so on.

I am using:

RVM
MacOs Catalina 10.15.6
ruby 2.6.5
and after bundle install I got log like this:
Fetching bson_ext 1.5.1
Installing bson_ext 1.5.1 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /Users/lukasz/.rvm/gems/ruby-2.6.5/gems/bson_ext-1.5.1/ext/cbson
/Users/lukasz/.rvm/rubies/ruby-2.6.5/bin/ruby -I /Users/lukasz/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0 -r ./siteconf20201001-15946-1sze5ll.rb extconf.rb
checking for asprintf()... yes
checking for ruby/st.h... yes
checking for ruby/regex.h... yes
checking for ruby/encoding.h... yes
creating Makefile

current directory: /Users/lukasz/.rvm/gems/ruby-2.6.5/gems/bson_ext-1.5.1/ext/cbson
make "DESTDIR=" clean

current directory: /Users/lukasz/.rvm/gems/ruby-2.6.5/gems/bson_ext-1.5.1/ext/cbson
make "DESTDIR="
compiling bson_buffer.c
compiling cbson.c
cbson.c:118:36: warning: passing 'char *' to parameter of type 'const unsigned char *' converts between pointers to integer types with different sign [-Wpointer-sign]
    result_t status = check_string(RSTRING_PTR(string), RSTRING_LEN(string),
                                   ^~~~~~~~~~~~~~~~~~~
/Users/lukasz/.rvm/rubies/ruby-2.6.5/include/ruby-2.6.0/ruby/ruby.h:1003:5: note: expanded from macro 'RSTRING_PTR'
    (!(RBASIC(str)->flags & RSTRING_NOEMBED) ? \
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./encoding_helpers.h:26:44: note: passing argument to parameter 'string' here
result_t check_string(const unsigned char* string, const int length,
                                           ^
cbson.c:118:57: warning: implicit conversion loses integer precision: 'long' to 'int' [-Wshorten-64-to-32]
    result_t status = check_string(RSTRING_PTR(string), RSTRING_LEN(string),
                      ~~~~~~~~~~~~ ^~~~~~~~~~~~~~~~~~~
/Users/lukasz/.rvm/rubies/ruby-2.6.5/include/ruby-2.6.0/ruby/ruby.h:1000:6: note: expanded from macro 'RSTRING_LEN'
     RSTRING_EMBED_LEN(str) : \
     ^~~~~~~~~~~~~~~~~~~~~~
/Users/lukasz/.rvm/rubies/ruby-2.6.5/include/ruby-2.6.0/ruby/ruby.h:996:6: note: expanded from macro 'RSTRING_EMBED_LEN'
     (long)((RBASIC(str)->flags >> RSTRING_EMBED_LEN_SHIFT) & \
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cbson.c:118:57: warning: implicit conversion loses integer precision: 'long' to 'int' [-Wshorten-64-to-32]
    result_t status = check_string(RSTRING_PTR(string), RSTRING_LEN(string),
                      ~~~~~~~~~~~~ ^~~~~~~~~~~~~~~~~~~
/Users/lukasz/.rvm/rubies/ruby-2.6.5/include/ruby-2.6.0/ruby/ruby.h:1001:28: note: expanded from macro 'RSTRING_LEN'
     RSTRING(str)->as.heap.len)
     ~~~~~~~~~~~~~~~~~~~~~~^~~
cbson.c:128:45: warning: implicit conversion loses integer precision: 'long' to 'int' [-Wshorten-64-to-32]
    SAFE_WRITE(buffer, RSTRING_PTR(string), RSTRING_LEN(string));
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
/Users/lukasz/.rvm/rubies/ruby-2.6.5/include/ruby-2.6.0/ruby/ruby.h:1000:6: note: expanded from macro 'RSTRING_LEN'
     RSTRING_EMBED_LEN(str) : \
     ^
/Users/lukasz/.rvm/rubies/ruby-2.6.5/include/ruby-2.6.0/ruby/ruby.h:996:6: note: expanded from macro 'RSTRING_EMBED_LEN'
     (long)((RBASIC(str)->flags >> RSTRING_EMBED_LEN_SHIFT) & \
     ^
cbson.c:68:46: note: expanded from macro 'SAFE_WRITE'
    if (bson_buffer_write((buffer), (data), (size)) != 0) \
        ~~~~~~~~~~~~~~~~~ ^~~~
cbson.c:128:45: warning: implicit conversion loses integer precision: 'long' to 'int' [-Wshorten-64-to-32]
    SAFE_WRITE(buffer, RSTRING_PTR(string), RSTRING_LEN(string));
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
/Users/lukasz/.rvm/rubies/ruby-2.6.5/include/ruby-2.6.0/ruby/ruby.h:1001:28: note: expanded from macro 'RSTRING_LEN'
     RSTRING(str)->as.heap.len)
                           ^
cbson.c:68:46: note: expanded from macro 'SAFE_WRITE'
    if (bson_buffer_write((buffer), (data), (size)) != 0) \
        ~~~~~~~~~~~~~~~~~ ^~~~
cbson.c:303:20: warning: unused variable 'values' [-Wunused-variable]
            VALUE* values;
                   ^
cbson.c:602:18: error: implicit declaration of function 'bson_buffer_get_max_size' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    if (length > bson_buffer_get_max_size(buffer)) {
                 ^
cbson.c:602:18: note: did you mean 'bson_buffer_set_max_size'?
./bson_buffer.h:34:6: note: 'bson_buffer_set_max_size' declared here
void bson_buffer_set_max_size(bson_buffer_t buffer, int max_size);
     ^
6 warnings and 1 error generated.
make: *** [cbson.o] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/lukasz/.rvm/gems/ruby-2.6.5/gems/bson_ext-1.5.1 for inspection.
Results logged to /Users/lukasz/.rvm/gems/ruby-2.6.5/extensions/x86_64-darwin-19/2.6.0/bson_ext-1.5.1/gem_make.out

An error occurred while installing bson_ext (1.5.1), and Bundler cannot continue.
Make sure that `gem install bson_ext -v '1.5.1' --source 'https://rubygems.org/'` succeeds before bundling.

In Gemfile:
  bson_ext
 In addition I can say that bson_ext with other version like 1.9.1 are installing successfully. But in this project I have to use 1.5.1.