diff --git a/rubygem-flexmock-2.3.6-accept-keywords.patch b/rubygem-flexmock-2.3.6-accept-keywords.patch
new file mode 100644
index 0000000..8eb92c4
--- /dev/null
+++ b/rubygem-flexmock-2.3.6-accept-keywords.patch
@@ -0,0 +1,15 @@
+diff -urp '--exclude=*~' flexmock-2.3.6/lib.orig/flexmock/composite_expectation.rb flexmock-2.3.6/lib/flexmock/composite_expectation.rb
+--- flexmock-2.3.6/lib.orig/flexmock/composite_expectation.rb	2021-01-24 01:35:33.614853539 +0900
++++ flexmock-2.3.6/lib/flexmock/composite_expectation.rb	2021-01-24 02:27:58.007313654 +0900
+@@ -16,9 +16,9 @@ class FlexMock
+     end
+ 
+     # Apply the constraint method to all expectations in the composite.
+-    def method_missing(sym, *args, &block)
++    def method_missing(sym, *args, **keywords, &block)
+       @expectations.each do |expectation|
+-        expectation.send(sym, *args, &block)
++        expectation.send(sym, *args, **keywords, &block)
+       end
+       self
+     end
diff --git a/rubygem-flexmock-2.3.6-testsuite-binding-source.patch b/rubygem-flexmock-2.3.6-testsuite-binding-source.patch
new file mode 100644
index 0000000..a2d00d4
--- /dev/null
+++ b/rubygem-flexmock-2.3.6-testsuite-binding-source.patch
@@ -0,0 +1,11 @@
+--- flexmock-2.3.6/test/test_helper.rb.ruby3	2021-01-24 00:41:42.121385766 +0900
++++ flexmock-2.3.6/test/test_helper.rb	2021-01-24 00:44:25.866236105 +0900
+@@ -50,7 +50,7 @@
+     # added.
+     def assert_mock_failure(klass, options={}, &block)
+       ex = assert_failure(klass, options, &block)
+-      file = eval("__FILE__", block.binding)
++      file = block.binding.source_location.first
+       assert_matching_line(ex, file, options)
+     end
+ 
diff --git a/rubygem-flexmock-2.3.6-workaround-relax-error-message.patch b/rubygem-flexmock-2.3.6-workaround-relax-error-message.patch
new file mode 100644
index 0000000..8a523e4
--- /dev/null
+++ b/rubygem-flexmock-2.3.6-workaround-relax-error-message.patch
@@ -0,0 +1,12 @@
+--- flexmock-2.3.6/test/partial_mock_test.rb.workaround	2021-01-24 02:36:13.468840410 +0900
++++ flexmock-2.3.6/test/partial_mock_test.rb	2021-01-24 03:03:55.748278701 +0900
+@@ -621,7 +621,8 @@
+     exception = assert_raises(NameError) do
+         obj.mocked_method
+     end
+-    assert_equal "undefined method `does_not_exist' for #{obj}", exception.message
++    assert(/undefined method `does_not_exist' for #<#<Class:/ === exception.message, 
++        "expected #{exception.message} to match /undefined method `does_not_exist' for #<#<Class:/")
+   end
+ 
+   def test_it_checks_whether_mocks_are_forbidden_before_forwarding_the_call
diff --git a/rubygem-flexmock.spec b/rubygem-flexmock.spec
index d5f4700..2992dfb 100644
--- a/rubygem-flexmock.spec
+++ b/rubygem-flexmock.spec
@@ -2,11 +2,14 @@
 Summary:             Mock object library for ruby
 Name:                rubygem-%{gem_name}
 Version:             2.3.6
-Release:             1
+Release:             2
 License:             MIT
 URL:                 https://github.com/doudou/flexmock
 Source0:             https://rubygems.org/gems/%{gem_name}-%{version}.gem
 Source1:             https://github.com/doudou/%{gem_name}/archive/v%{version}.tar.gz
+Patch1:              rubygem-flexmock-2.3.6-testsuite-binding-source.patch
+Patch2:              rubygem-flexmock-2.3.6-accept-keywords.patch
+Patch3:              rubygem-flexmock-2.3.6-workaround-relax-error-message.patch
 Requires:            ruby(release)
 BuildRequires:       ruby(release) rubygems-devel rubygem(minitest) >= 5 rubygem(rspec) >= 3
 Requires:            ruby(rubygems)
@@ -25,12 +28,24 @@ Obsoletes:           %{name}-doc < %{version}-%{release}
 This package contains documentation for %{name}.
 
 %prep
-%setup -q -c -T
-%gem_install -n %{SOURCE0}
+gem unpack %{SOURCE0}
+%setup -q -D -T -n  %{gem_name}-%{version} -a 1
+
+gem spec %{SOURCE0} -l --ruby > %{gem_name}.gemspec
+
+(
+cd %{gem_name}-%{version}
+%patch1 -p1
+%patch3 -p1
+)
+%patch2 -p1
+
 find . -name \*.rb | xargs sed -i -e '\@/usr/bin/env@d'
 find . -name \*.gem -or -name \*.rb -or -name \*.rdoc | xargs chmod 0644
 
 %build
+gem build %{gem_name}.gemspec
+%gem_install
 
 %install
 mkdir -p %{buildroot}%{gem_dir}
@@ -46,12 +61,13 @@ rm -rf \
 popd
 
 %check
+cp -a %{gem_name}-%{version}/test .%{gem_instdir}
 pushd .%{gem_instdir}
 pwd
 ls
-tar xf %{SOURCE1}
-mv %{gem_name}-%{version}/test .
-ruby -Ilib:.:test \
+export RUBYOPT=-W:deprecated
+export RUBYLIB=$(pwd)/lib:$(pwd):$(pwd)/test
+ruby \
     -e 'Dir.glob("test/*_test.rb").each {|f| require f}'
 rspec test/rspec_integration/
 popd
@@ -70,5 +86,8 @@ popd
 %{gem_docdir}/
 
 %changelog
+* Tue Feb 22 2022 chenchen <chen_aka_jan@163.com> - 2.3.6-2
+- fix build error by upgrading to ruby3
+
 * Mon Aug 24 2020 xiezheng <xiezheng4@huawei.com> - 2.3.6-1
 - package init