Source1:        myapp.desktop

...

desktop-file-install                                    \
--dir=${RPM_BUILD_ROOT}%{_datadir}/applications         \
%{SOURCE1}

xdg-desktop-icon install --novendor %{SOURCE1}

##</code><code>##

error: Installed (but unpackaged) file(s) found:
   /usr/share/applications/myapp.desktop

##</code><code>##

Name:           perl-MyApp
Version:        1.0
Release:        1%{?dist}
Summary:        MyApp Perl module
License:        Distributable, see COPYING COPYING.LESSER
Group:          Development/Libraries
URL:            http://search.cpan.org/dist/MyApp/
Source0:        http://www.cpan.org/modules/by-module/MyApp-%{version}.tar.gz
Source1:        myapp.desktop
BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
BuildArch:      noarch
BuildRequires:  perl(ExtUtils::MakeMaker)
Requires:       perl(:MODULE_COMPAT_%(eval "`%{__perl} -V:version`"; echo $version))

%description
blah blah blah

%prep
%setup -q -n MyApp-%{version}

%build
%{__perl} Makefile.PL INSTALLDIRS=vendor
make %{?_smp_mflags}

%install
rm -rf $RPM_BUILD_ROOT

make pure_install PERL_INSTALL_ROOT=$RPM_BUILD_ROOT

find $RPM_BUILD_ROOT -type f -name .packlist -exec rm -f {} \;
find $RPM_BUILD_ROOT -depth -type d -exec rmdir {} 2>/dev/null \;

%{_fixperms} $RPM_BUILD_ROOT/*

desktop-file-install                                    \
--dir=${RPM_BUILD_ROOT}%{_datadir}/applications         \
%{SOURCE1}

xdg-desktop-icon install --novendor %{SOURCE1}

%check
make test

%clean
rm -rf $RPM_BUILD_ROOT

%files
%defattr(-,root,root,-)
%doc CHANGES COPYING COPYING.LESSER README
%{perl_vendorlib}/*
%{_mandir}/man3/*