diff --git a/eb_hooks.py b/eb_hooks.py
index 488e53d929..95092fbdc2 100644
--- a/eb_hooks.py
+++ b/eb_hooks.py
@@ -274,6 +274,22 @@ def pre_test_hook_ignore_failing_tests_SciPybundle(self, *args, **kwargs):
         self.cfg['testopts'] = "|| echo ignoring failing tests" 
 
 
+def pre_single_extension_hook(ext, *args, **kwargs):
+    """Main pre-configure hook: trigger custom functions based on software name."""
+    if ext.name in PRE_SINGLE_EXTENSION_HOOKS:
+        PRE_SINGLE_EXTENSION_HOOKS[ext.name](ext, *args, **kwargs)
+
+
+def pre_single_extension_testthat(ext, *args, **kwargs):
+    """
+    Pre-extension hook for testthat, to fix build on top of recent glibc.
+    """
+    if ext.name == 'testthat' and LooseVersion(ext.version) < LooseVersion('3.1.0'):
+        # use constant value instead of SIGSTKSZ for stack size,
+        # cfr. https://github.com/r-lib/testthat/issues/1373 + https://github.com/r-lib/testthat/pull/1403
+        ext.cfg['preinstallopts'] = "sed -i 's/SIGSTKSZ/32768/g' inst/include/testthat/vendor/catch.h && "
+
+
 PARSE_HOOKS = {
     'CGAL': parse_hook_cgal_toolchainopts_precise,
     'fontconfig': parse_hook_fontconfig_add_fonts,
@@ -296,3 +312,7 @@ def pre_test_hook_ignore_failing_tests_SciPybundle(self, *args, **kwargs):
 PRE_TEST_HOOKS = {
     'SciPy-bundle': pre_test_hook_ignore_failing_tests_SciPybundle,
 }
+
+PRE_SINGLE_EXTENSION_HOOKS = {
+    'testthat': pre_single_extension_testthat,
+}