Amended the .spec file

OBS-URL: https://build.opensuse.org/package/show/science:machinelearning/libzdnn?expand=0&rev=11

libzdnn.spec

@@ -26,6 +26,11 @@ URL:            https://github.com/IBM/zDNN
 Source:         zDNN-1.1.1.tar.gz
 BuildRequires:  autoconf
 BuildRequires:  gcc-c++
+%if %{gcc_version} < 13
+BuildRequires:  gcc13-c++
+%else
+BuildRequires:  gcc%{gcc_version}-c++
+%endif
 
 ExclusiveArch:  s390x
 
@@ -64,6 +69,15 @@ shared library for the libzdnn (zDNN) RPM.
 %autosetup -p1 -n zDNN-%{version}
 
 %build
+
+export CC=gcc-%{gcc_version}
+export CXX=g++-%{gcc_version}
+
+%if %{gcc_version} < 13
+export CC=gcc-13
+export CXX=g++-13
+%endif
+
 autoconf
 %configure
 %make_build build