Spec: Update gcc-c++ dependency for c++20

Author: Pavel Siska

pkg/rpm/telemetry.spec.in

@@ -7,12 +7,19 @@ License:       BSD
 Source0:       %{name}-%{version}.tar.gz
 
 BuildRoot:     %{_tmppath}/%{name}-%{version}-%{release}
-BuildRequires: gcc-c++ >= 8
 BuildRequires: make
 BuildRequires: git
 BuildRequires: fuse3-devel >= 3.2.1
 BuildRequires: cmake >= 3.12
 
+%if 0%{?rhel} && 0%{?rhel} <= 8
+BuildRequires: gcc-toolset-11
+BuildRequires: gcc-toolset-11-gcc
+BuildRequires: gcc-toolset-11-gcc-c++
+%else
+BuildRequires: gcc-c++ >= 11.5
+%endif
+
 Requires: fuse3
 
 %description
@@ -23,6 +30,10 @@ telemetry data in your program.
 %autosetup
 
 %build
+%if 0%{?rhel} && 0%{?rhel} <= 8
+source /opt/rh/gcc-toolset-11/enable
+%endif
+
 %cmake -DCMAKE_BUILD_TYPE=Release
 %cmake_build