Un-hardcode path.

libffado.spec

@@ -1,7 +1,7 @@
 Summary:        Free firewire audio driver library
 Name:           libffado
 Version:        2.4.1
-Release:        8%{?dist}
+Release:        9%{?dist}
 # src/libutil/float_cast.h is LGPLv2+.
 # The rest is (GPLv2 or GPLv3)
 License:        LGPLv2+ and (GPLv2 or GPLv3)
@@ -76,7 +76,7 @@ sed -i '/Install/d' tests/{,*/}SConscript
 sed -i 's|hi64-apps-ffado.png|ffado.png|' support/mixer-qt4/ffado/ffadowindow.py
 
 # Fix Python shebangs
-sed -i 's|/usr/bin/.*python$|/usr/bin/python2|' \
+sed -i 's|/usr/bin/.*python$|%{_prefix}/bin/python2|' \
     admin/*.py doc/SConscript tests/python/*.py tests/*.py \
     support/mixer-qt4/ffado-mixer* support/mixer-qt4/SConscript \
     support/tools/*.py support/tools/SConscript
@@ -95,7 +95,7 @@ scons-2 %{?_smp_mflags} \
       MANDIR=%{_mandir} \
       UDEVDIR=%{_prefix}/lib/udev/rules.d/ \
       PYPKGDIR=%{python2_sitelib}/ffado/ \
-      PYTHON_INTERPRETER=/usr/bin/python2 \
+      PYTHON_INTERPRETER=%{_prefix}/bin/python2 \
       BUILD_TESTS=1
 
 %install
@@ -155,6 +155,9 @@ appstream-util validate-relax --nonet \
 
 
 %changelog
+* Mon Aug 19 2019 Gwyn Ciesla <gwync@protonmail.com> - 2.4.1-9
+- Un-hardcode prefix for flatpak.
+
 * Sat Aug 03 2019 Orcan Ogetbil <oget[DOT]fedora[AT]gmail[DOT]com> - 2.4.1-8
 - scons renamed to scons-2 in the recent Fedora package