diff --git a/leatherman-gcc11.patch b/leatherman-gcc11.patch
new file mode 100644
index 0000000..4ef6eee
--- /dev/null
+++ b/leatherman-gcc11.patch
@@ -0,0 +1,38 @@
+diff --git a/curl/src/client.cc b/curl/src/client.cc
+index 558db6d..d27bb36 100644
+--- a/curl/src/client.cc
++++ b/curl/src/client.cc
+@@ -1,3 +1,4 @@
++#include <cstddef>
+ #include <leatherman/curl/client.hpp>
+ #include <leatherman/curl/request.hpp>
+ #include <leatherman/curl/response.hpp>
+diff --git a/util/src/posix/scoped_descriptor.cc b/util/src/posix/scoped_descriptor.cc
+index 6fd1495..8294d0b 100644
+--- a/util/src/posix/scoped_descriptor.cc
++++ b/util/src/posix/scoped_descriptor.cc
+@@ -1,3 +1,5 @@
++#include <cstddef>
++
+ #include <leatherman/util/posix/scoped_descriptor.hpp>
+ 
+ using namespace std;
+diff --git a/util/src/scope_exit.cc b/util/src/scope_exit.cc
+index 764c2fb..441855a 100644
+--- a/util/src/scope_exit.cc
++++ b/util/src/scope_exit.cc
+@@ -1,3 +1,4 @@
++#include <cstddef>
+ #include <leatherman/util/scope_exit.hpp>
+ 
+ using namespace std;
+diff --git a/util/src/scoped_env.cc b/util/src/scoped_env.cc
+index 6c6a041..df26645 100644
+--- a/util/src/scoped_env.cc
++++ b/util/src/scoped_env.cc
+@@ -1,3 +1,5 @@
++#include <cstddef>
++
+ #include <leatherman/util/scoped_env.hpp>
+ #include <leatherman/util/environment.hpp>
+ 
diff --git a/leatherman.spec b/leatherman.spec
index bf4dde4..d7fe1c6 100644
--- a/leatherman.spec
+++ b/leatherman.spec
@@ -1,6 +1,6 @@
 Name:           leatherman
 Version:        1.12.0
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        Collection of C++ and CMake utility libraries
 
 # leatherman is ASL 2.0
@@ -14,6 +14,8 @@ Source:         %{url}/archive/%{version}/%{name}-%{version}.tar.gz
 Patch0:         shared_nowide.patch
 # Add missing include for <stdexcept>, no longer indirectly included in GCC 10
 Patch1:         leatherman-gcc10.patch
+# Similar for cstddef and gcc-11
+Patch2:         %{name}-gcc11.patch
 
 BuildRequires:  cmake >= 3.2.2
 BuildRequires:  make
@@ -72,6 +74,9 @@ sed -i -e "s/\s*-Werror\s*//g" cmake/cflags.cmake
 %{_libdir}/cmake/%{name}/
 
 %changelog
+* Wed Nov 04 2020 Jeff Law <law@redhat.com> - 1.12.0-4
+- Fix missing #includes for gcc-11
+
 * Tue Jul 28 2020 Fedora Release Engineering <releng@fedoraproject.org> - 1.12.0-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild