bhavin@ubuntu:~/mozilla-central$ ./mach build
 0:04.08 /usr/bin/make -f client.mk -s
 0:06.62 Adding client.mk options from /home/bhavin/mozilla-central/mozconfig:
 0:06.62     CONFIG_GUESS=arm-linux-androideabi
 0:06.62     MOZ_OBJDIR=/home/bhavin/mozilla-central/objdir-frontend
 0:06.62     OBJDIR=/home/bhavin/mozilla-central/objdir-frontend
 0:06.62     FOUND_MOZCONFIG=/home/bhavin/mozilla-central/mozconfig
 0:07.15 cd /home/bhavin/mozilla-central/objdir-frontend
 0:07.15 /home/bhavin/mozilla-central/configure
 0:07.64 Reexecuting in the virtualenv
 0:09.25 Adding configure options from /home/bhavin/mozilla-central/mozconfig
 0:09.25   --enable-application=mobile/android
 0:09.25   --target=arm-linux-androideabi
 0:09.25   --with-android-sdk=/home/bhavin/Android/Sdk/
 0:09.25   --enable-artifact-builds
 0:09.55 checking for a shell... /bin/sh
 0:09.69 checking for host system type... x86_64-pc-linux-gnu
 0:09.72 checking for target system type... arm-unknown-linux-androideabi
 0:09.72 checking whether cross compiling... yes
 0:09.74 checking for tar... /bin/tar
 0:09.74 checking for unzip... /usr/bin/unzip
 0:09.74 checking for zip... /usr/bin/zip
 0:09.74 checking for awk... /usr/bin/gawk
 0:09.74 checking for perl... /usr/bin/perl
 0:09.74 checking for minimum required perl version >= 5.006... 5.022001
 0:09.78 checking for full perl installation... yes
 0:09.78 checking for doxygen... not found
 0:09.78 checking for xargs... /usr/bin/xargs
 0:09.78 checking for autoconf...
 0:09.78 ERROR: Could not find autoconf 2.13
 0:09.80 *** Fix above errors and then restart with\
 0:09.80                "/usr/bin/make -f client.mk build"
 0:09.80 /home/bhavin/mozilla-central/client.mk:370: recipe for target 'configure' failed
 0:09.80 make[2]: *** [configure] Error 1
 0:09.81 /home/bhavin/mozilla-central/client.mk:387: recipe for target '/home/bhavin/mozilla-central/objdir-frontend/Makefile' failed
 0:09.81 make[1]: *** [/home/bhavin/mozilla-central/objdir-frontend/Makefile] Error 2
 0:09.81 client.mk:168: recipe for target 'build' failed
 0:09.81 make: *** [build] Error 2
 0:09.83 0 compiler warnings present.