diff --git a/wlcs.spec b/wlcs.spec
index 7dca8f9..a6fbbed 100644
--- a/wlcs.spec
+++ b/wlcs.spec
@@ -1,14 +1,14 @@
-# Lists copied from gcc.spec
-# Current as of 16.0.1 (lines 83, 103, and 93, respectively).
+# Lists copied from https://git.centos.org/rpms/gcc/blob/c9/f/SPECS/gcc.spec
+# Current as of 11.3.1 (lines 56, 71, and 61, respectively).
 # Note that asan and ubsan are available on all Fedora primary architectures;
-# tsan is missing on i686 only.
-%ifarch %{ix86} x86_64 ppc ppc64 ppc64le ppc64p7 s390 s390x %{arm} aarch64 riscv64
+# tsan is missing on i686 and s390x.
+%ifarch %{ix86} x86_64 ppc ppc64 ppc64le ppc64p7 s390 s390x %{arm} aarch64
 %global arch_has_asan 1
 %endif
-%ifarch %{ix86} x86_64 ppc ppc64 ppc64le ppc64p7 s390 s390x %{arm} aarch64 riscv64
+%ifarch %{ix86} x86_64 ppc ppc64 ppc64le ppc64p7 s390 s390x %{arm} aarch64
 %global arch_has_ubsan 1
 %endif
-%ifarch x86_64 ppc64 ppc64le aarch64 s390x riscv64
+%ifarch x86_64 ppc64 ppc64le aarch64
 %global arch_has_tsan 1
 %endif
 
@@ -83,22 +83,12 @@ SourceLicense:  %{shrink:
 URL:            https://github.com/MirServer/wlcs
 Source:         %{url}/archive/v%{version}/wlcs-%{version}.tar.gz
 
-BuildSystem:    cmake
-# WLCS_FATAL_COMPILE_WARNINGS: makes sense for upstream CI, but too strict for
-#                              downstream packaging
-BuildOption(conf): %{shrink:
-    -DWLCS_BUILD_ASAN=%{?with_asan:ON}%{?!with_asan:OFF}
-    -DWLCS_BUILD_TSAN=%{?with_tsan:ON}%{?!with_tsan:OFF}
-    -DWLCS_BUILD_UBSAN=%{?with_ubsan:ON}%{?!with_ubsan:OFF}
-    -DWLCS_FATAL_COMPILE_WARNINGS:BOOL=OFF
-    }
-# We have built a test suite for compositors, but we have no tests for the test
-# suite, i.e., %%ctest would find no tests and there is nothing useful we could
-# do in %%check.
-
 BuildRequires:  gcc
 BuildRequires:  gcc-c++
 
+BuildRequires:  cmake
+BuildRequires:  ninja-build
+
 BuildRequires:  boost-devel
 BuildRequires:  cmake(GTest)
 BuildRequires:  gmock-devel
@@ -145,6 +135,31 @@ The wlcs-devel package contains libraries and header files for developing
 Wayland compositor tests that use wlcs.
 
 
+%prep
+%autosetup
+
+
+%build
+# WLCS_FATAL_COMPILE_WARNINGS: makes sense for upstream CI, but too strict for
+#                              downstream packaging
+%cmake \
+    -DWLCS_BUILD_ASAN=%{?with_asan:ON}%{?!with_asan:OFF} \
+    -DWLCS_BUILD_TSAN=%{?with_tsan:ON}%{?!with_tsan:OFF} \
+    -DWLCS_BUILD_UBSAN=%{?with_ubsan:ON}%{?!with_ubsan:OFF} \
+    -DWLCS_FATAL_COMPILE_WARNINGS:BOOL=OFF \
+    -GNinja
+%cmake_build
+
+
+%install
+%cmake_install
+
+
+# We have built a test suite for compositors, but we have no tests for the test
+# suite, i.e., %%ctest would find no tests and there is nothing useful we could
+# do in %%check.
+
+
 %files
 %license COPYING.*
 %doc README.rst