firefox build

Creating config.status
Reticulating splines...
Finished reading 2776 moz.build files in 5.85s
Processed into 7821 build config descriptors in 4.42s
RecursiveMake backend executed in 12.22s
  2318 total backend files; 2318 created; 0 updated; 0 unchanged; 0 deleted; 39 -> 853 Makefile
FasterMake backend executed in 0.64s
  10 total backend files; 10 created; 0 updated; 0 unchanged; 0 deleted
Total wall time: 23.69s; CPU time: 16.94s; Efficiency: 72%; Untracked: 0.56s
make[2]: Leaving directory '/usr/pkgmk/build/firefox/src/firefox-49.0'
make 2 -s -j2 -C /usr/pkgmk/build/firefox/src/firefox-49.0/firefox-shared
make[2]: Entering directory '/usr/pkgmk/build/firefox/src/firefox-49.0/firefox-shared'
make[2]: *** No rule to make target '2'.  Stop.
make[2]: Leaving directory '/usr/pkgmk/build/firefox/src/firefox-49.0/firefox-shared'
make[1]: *** [/usr/pkgmk/build/firefox/src/firefox-49.0/client.mk:410: realbuild] Error 2
make[1]: Leaving directory '/usr/pkgmk/build/firefox/src/firefox-49.0'
make: *** [client.mk:168: build] Error 2
=======> ERROR: Building '/usr/pkgmk/package/firefox#49.0-1.pkg.tar.gz' failed.