--- a/MozillaFirefox/MozillaFirefox.spec Thu Jan 11 10:37:42 2018 +0100
+++ b/MozillaFirefox/MozillaFirefox.spec Thu Jan 11 16:29:08 2018 +0100
@@ -373,7 +373,7 @@
ac_add_options --disable-webrtc
%endif
EOF
-make -f client.mk build
+./mach build
%install
cd $RPM_BUILD_DIR/obj