diff --git a/cpu-x.changes b/cpu-x.changes
index 08f7ea4..3b29c62 100644
--- a/cpu-x.changes
+++ b/cpu-x.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Sun Nov  5 10:29:24 UTC 2023 - Manfred Hollstein <manfred.h@gmx.net>
+
+- Use gcc13 as Leap's default compiler does not provide "filesystem".
+- Add build requires for glibmm.
+
 -------------------------------------------------------------------
 Wed Nov  1 11:09:11 UTC 2023 - Jan Engelhardt <jengelh@inai.de>
 
diff --git a/cpu-x.spec b/cpu-x.spec
index 3f5119c..b0a422c 100644
--- a/cpu-x.spec
+++ b/cpu-x.spec
@@ -26,6 +26,10 @@ Group:          System/X11/Utilities
 URL:            https://github.com/TheTumultuousUnicornOfDarkness/CPU-X
 Source:         https://github.com/TheTumultuousUnicornOfDarkness/CPU-X/archive/refs/tags/v%version.tar.gz
 Patch1:         no-no-pie.patch
+%if 0%{suse_version} == 1500
+BuildRequires:  gcc13
+BuildRequires:  gcc13-c++
+%endif
 BuildRequires:  c++_compiler
 BuildRequires:  cmake >= 3.12
 BuildRequires:  gettext-tools
@@ -36,6 +40,7 @@ BuildRequires:  opencl-headers
 BuildRequires:  pkgconfig(OpenCL)
 BuildRequires:  pkgconfig(glfw3)
 BuildRequires:  pkgconfig(gtk+-3.0) >= 3.12.0
+BuildRequires:  pkgconfig(gtkmm-3.0) >= 3.12.0
 BuildRequires:  pkgconfig(libcpuid) >= 0.6.0
 BuildRequires:  pkgconfig(libpci)
 BuildRequires:  pkgconfig(libprocps)
@@ -84,6 +89,10 @@ Shell completion definitions from %name for %name.
 %autosetup -p1 -n %src_name
 
 %build
+%if 0%{suse_version} == 1500
+export CC=gcc-13
+export CXX=g++-13
+%endif
 %cmake \
   -DWITH_OPENCL=1
 %cmake_build