Disable NFS support in RHEL

The libnfs library is not available there.

gvfs.spec

@@ -174,6 +174,7 @@ This package provides support for reading and writing files on
 MTP based devices (Media Transfer Protocol) to applications using gvfs.
 
 
+%if ! 0%{?rhel}
 %package nfs
 Summary: NFS support for gvfs
 Requires: %{name}%{?_isa} = %{version}-%{release}
@@ -183,6 +184,7 @@ BuildRequires: pkgconfig(libnfs) >= %{libnfs_version}
 %description nfs
 This package provides support for reading and writing files on
 NFS network shares (Network File System) to applications using gvfs.
+%endif
 
 
 %package goa
@@ -209,12 +211,15 @@ the functionality of the installed gvfs package.
 %setup -q
 
 %build
+%meson -Dinstalled_tests=true \
+       -Dman=true \
 %ifarch s390 s390x
-%meson -Dinstalled_tests=true -Dman=true -Dafc=false
+       -Dafc=false \
-%else
-%meson -Dinstalled_tests=true -Dman=true
 %endif
-
+%if 0%{?rhel}
+       -Dnfs=false \
+%endif
+        %{nil}
 %meson_build
 
 %install
@@ -245,8 +250,10 @@ killall -USR1 gvfsd >&/dev/null || :
 
 %post archive
 killall -USR1 gvfsd >&/dev/null || :
+%if ! 0%{?rhel}
 %post nfs
 killall -USR1 gvfsd >&/dev/null || :
+%endif
 %post afp
 killall -USR1 gvfsd >&/dev/null || :
 
@@ -367,11 +374,13 @@ killall -USR1 gvfsd >&/dev/null || :
 %{_datadir}/gvfs/remote-volume-monitors/mtp.monitor
 %{_userunitdir}/gvfs-mtp-volume-monitor.service
 
+%if ! 0%{?rhel}
 %files nfs
 %{_libexecdir}/gvfsd-nfs
 # for privileged ports
 %caps(cap_net_bind_service=ep) %{_libexecdir}/gvfsd-nfs
 %{_datadir}/gvfs/mounts/nfs.mount
+%endif
 
 %files goa
 %{_libexecdir}/gvfs-goa-volume-monitor
@@ -389,6 +398,7 @@ killall -USR1 gvfsd >&/dev/null || :
 %changelog
 * Wed May 09 2018 Ondrej Holy <oholy@redhat.com> - 1.37.2-1
 - Update to 1.37.2
+- Disable NFS support in RHEL
 
 * Wed May 09 2018 Ondrej Holy <oholy@redhat.com> - 1.37.1-1
 - Update to 1.37.1