Drop el6 mention

libglvnd.spec

@@ -1,9 +1,6 @@
 #global commit0 f92208be88dd06a70b6f79a1cb95571e2762a9ec
 #global shortcommit0 %%(c=%%{commit0}; echo ${c:0:7})
 
-%if 0%{?el6}
-%global _without_mesa_glvnd_default 1
-%endif
 
 Name:           libglvnd
 Version:        1.3.2
@@ -29,25 +26,9 @@ BuildRequires:  pkgconfig(x11)
 BuildRequires:  pkgconfig(xext)
 BuildRequires:  xorg-x11-server-Xvfb
 
-%if (0%{?rhel} && 0%{?rhel} <= 6)
-BuildRequires:  autoconf268
-%endif
-
 %{?_without_mesa_glvnd_default:
-%if (0%{?rhel} && 0%{?rhel} <= 6)
-
-%{?filter_setup:
-%filter_provides_in %{_libdir}/%{name}
-%filter_requires_in %{_libdir}/%{name}
-%filter_setup
-}
-
-%else
-
 %global __provides_exclude_from %{_libdir}/%{name}
 %global __requires_exclude_from %{_libdir}/%{name}
-
-%endif
 }
 
 %description
@@ -145,11 +126,7 @@ libGL and libGLX are the common dispatch interface for the GLX API.
 
 %prep
 %autosetup -p1 -n %{name}-%{?commit0}%{?!commit0:%{version}}
-%if 0%{?rhel} == 6
-autoreconf268 -vif
-%else
 autoreconf -vif
-%endif
 
 %build
 export PYTHON=%{__python3}