diff --git a/.gitignore b/.gitignore
index 2c761f4..f18726d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,3 +19,5 @@
 /rcairo-1.15.9-test-missing-files.tar.gz
 /cairo-1.15.10.gem
 /rcairo-1.15.10-test-missing-files.tar.gz
+/cairo-1.15.11.gem
+/rcairo-1.15.11-test-missing-files.tar.gz
diff --git a/rubygem-cairo.spec b/rubygem-cairo.spec
index 201890b..1fe2f99 100644
--- a/rubygem-cairo.spec
+++ b/rubygem-cairo.spec
@@ -2,7 +2,7 @@
 %global	header_dir	%{ruby_vendorarchdir}
 
 %global	gem_name		cairo
-%global	gemver		1.15.10
+%global	gemver		1.15.11
 #%%global	gem_githash	af3e3fc059
 
 # Upstream GIT http://github.com/rcairo/
@@ -85,15 +85,19 @@ Header files and libraries for building a extension library for the
 ruby-cairo
 
 %prep
-%setup -q -T -c
+%setup -q -c -T
 
-mkdir -p ./%{gem_dir}
-export CONFIGURE_ARGS="--with-cflags='%{optflags}'"
-%gem_install -n %{SOURCE0}
+TOPDIR=$(pwd)
+mkdir tmpunpackdir
+pushd tmpunpackdir
 
-find . -name \*.gem | xargs chmod 0644
+gem unpack %{SOURCE0}
+cd %{gem_name}-%{version}
+
+#Patches, etc
+
+gem specification -l --ruby %{SOURCE0} > %{gem_name}.gemspec
 
-%build
 # pkg-config dependency should be for development
 find . -name \*.gemspec | \
 	xargs sed -i  \
@@ -101,6 +105,15 @@ find . -name \*.gemspec | \
 		-e '\@native-package-installer@s|runtime_dependency|development_dependency|' \
 		%{nil}
 
+gem build %{gem_name}.gemspec
+mv %{gem_name}-%{version}.gem $TOPDIR
+
+popd
+rm -rf tmpunpackdir
+
+%build
+%gem_install
+
 # Once install to TMPINSTDIR for %%check
 rm -rf ./TMPINSTDIR
 mkdir -p ./TMPINSTDIR/%{gem_dir}
@@ -172,14 +185,7 @@ cp -a rcairo/test/* test
 sed -i -e '\@require .rubygems@a\\ngem "test-unit"\n' test/run-test.rb
 sed -i -e "\@require 'bundler/setup'@d" test/run-test.rb
 
-# Tracking: https://github.com/rcairo/rcairo/issues/50
-ruby ./test/run-test.rb || \
-%if 0%{?fedora} >= 27
-	true
-%else
-	false
-%endif
-popd
+ruby ./test/run-test.rb
 
 %files
 %if 0%{?fedora} >= 21
@@ -213,6 +219,9 @@ popd
 %{header_dir}/rb_cairo.h
 
 %changelog
+* Wed Dec 27 2017 Mamoru TASAKA <mtasaka@fedoraproject.org> - 1.15.11-1
+- 1.15.11
+
 * Sat Oct 21 2017 Mamoru TASAKA <mtasaka@fedoraproject.org> - 1.15.10-1
 - 1.15.10
 
diff --git a/sources b/sources
index b4a801e..fb9b856 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-SHA512 (cairo-1.15.10.gem) = af3cec5bf03022a5049922aaa0366b7330ec0e2003734ee855d1d9632d2027be6e08efd8b67c02bf3d006d11d8a7e28ac3d23ce9591940dc92442c7552858907
-SHA512 (rcairo-1.15.10-test-missing-files.tar.gz) = bae8b81843ff0a0e740f0522c1f88494637ea94298c36eb48e0b9345f46d58f0f4fbf232c7c133b4c0cdc32ffdf5f8a4a25c7c1f6157dab3be2e9a14908dbcb7
+SHA512 (cairo-1.15.11.gem) = 3c21468511eac323b27a86e1c5188b5444d3bf2de244f4dc35d0ae297cb3f1756ec8333555bb7c4178e9f4ebcfd1600e6fd77fa7fe76055bf633bb2f8c69271c
+SHA512 (rcairo-1.15.11-test-missing-files.tar.gz) = 4a899926d84e4392c889647804ea9e79511544c29fa34137020fac97bd424b5346fbc280142b226f82f9421865b382a881da38ecf0acb45905dc9e230014fbb2