SIGSTKSZ redefined to sysconf(_SC_SIGSTKSZ) causing build failure

Box2D.spec

@@ -1,7 +1,7 @@
 %global __cmake_in_source_build 1
 Name: Box2D
 Version:  2.4.1
-Release:  4%{?dist}
+Release:  5%{?dist}
 Summary: A 2D Physics Engine for Games
 
 License: zlib
@@ -35,7 +35,7 @@ These are the development files.
 rm -r extern
 
 %build
-%cmake -DBOX2D_INSTALL=ON -DBOX2D_BUILD_SHARED=ON -DBOX2D_BUILD_TESTBED=OFF .
+%cmake -DBOX2D_INSTALL=ON -DBOX2D_BUILD_SHARED=ON -DBOX2D_BUILD_TESTBED=OFF -DBOX2D_BUILD_UNIT_TESTS=OFF .
 %cmake_build
 
 %install
@@ -54,6 +54,11 @@ rm -r extern
 %{_libdir}/cmake/box2d/*.cmake
 
 %changelog
+* Wed Feb 17 2021 Caolán McNamara <caolanm@redhat.com> - 2.4.1-5
+- disable building BOX2D_BUILD_UNIT_TESTS due to "SIGSTKSZ ... no
+  longer constant on Linux ... redefined to sysconf(_SC_SIGSTKSZ)"
+  https://github.com/bminor/glibc/blob/master/NEWS causing build failure
+
 * Wed Feb 17 2021 Caolán McNamara <caolanm@redhat.com> - 2.4.1-4
 - reduce unnecessary dependencies