Don't use packaging files, but rather files we send upstream.

acme.desktop

@@ -1,10 +0,0 @@
-[Desktop Entry]
-Type=Application
-Name=Acme
-GenericName=Editor
-Comment=Editor from Plan9
-Exec=acme
-Icon=acme
-Terminal=false
-StartupNotify=false
-Categories=Development;TextEditor

acme.sh

@@ -1,3 +0,0 @@
-#!/bin/sh
-. /etc/profile.d/plan9.sh
-9 acme "$@"

plan9.sh

@@ -1,4 +0,0 @@
-export PLAN9=/usr/lib/plan9
-export PATH=$PATH:$PLAN9/bin
-export ROOTPATH=$ROOTPATH:$PLAN9/bin
-export MANPATH=$MANPATH:$PLAN9/man

plan9port.spec

@@ -23,10 +23,6 @@ Summary:        A port of many Plan 9 libraries and programs to Unix
 License:        MIT AND LPL-1.02 AND BSD-3-Clause
 URL:            https://swtch.com/plan9port
 #!RemoteAssetUrl: git+https://git.sr.ht/~mcepl/plan9port#devel
-Source1:        plan9.sh
-Source2:        acme.sh
-Source3:        acme.png
-Source4:        acme.desktop
 Source99:       %{name}.rpmlintrc
 BuildRequires:  fdupes
 BuildRequires:  fuse
@@ -72,15 +68,15 @@ grep --null -l -r "%{buildroot}/usr/lib/plan9" | xargs --null sed -i "s@%{buildr
 grep --null -l -r "/build/plan9port/pkg/%{name}/usr/lib/plan9" | xargs --null \
 sed -i "s!/build/plan9port/pkg/%{name}/usr/lib/plan9!%{_libdir}/plan9!g" || true
 
-# fix shebangs
+install -Dm644 dist/plan9.sh %{buildroot}%{_sysconfdir}/profile.d/plan9.sh
+install -Dm755 dist/acme.sh %{buildroot}%{_bindir}/acme
+install -Dm644 dist/spaceglenda100.png %{buildroot}%{_datadir}/pixmaps/acme.png
+install -Dm644 dist/acme.desktop %{buildroot}%{_datadir}/applications/acme.desktop
+
+# fix shebangs and variables
 sed -i -e '/^# *\/usr\/bin\/env/s!/usr/bin/env perl!%{_bindir}/perl!' \
     %{buildroot}%{_libdir}/plan9/dist/{addsrclinks,fixurls}
-
-install -Dm644 %{SOURCE1} %{buildroot}%{_sysconfdir}/profile.d/plan9.sh
-install -Dm755 %{SOURCE2} %{buildroot}%{_bindir}/acme
-install -Dm644 %{SOURCE3} %{buildroot}%{_datadir}/pixmaps/acme.png
-install -Dm644 %{SOURCE4} %{buildroot}%{_datadir}/applications/acme.desktop
-
+sed -i -e '/^export PLAN9/s!/usr/lib!%{_libdir}!' %{buildroot}%{_sysconfdir}/profile.d/plan9.sh
 
 # Clean up
 cd "%{buildroot}%{_libdir}/plan9"