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Mach Problem

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$ ./mach  build
 0:00.10 /usr/bin/make -f client.mk -s
 0:00.15 /home/antkong/wd/mozilla-central/client.mk:315: *** Could not find autoconf 2.13.  Stop.
 0:00.15 make: *** [build] Error 2
 0:00.17 0 compiler warnings present.

it comes from this check of mozilla-central/client.mk

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# try to find autoconf 2.13 - discard errors from 'which'
# MacOS X 10.4 sends "no autoconf*" errors to stdout, discard those via grep
AUTOCONF ?= $(shell which autoconf-2.13 autoconf2.13 autoconf213 2>/dev/null | grep -v '^no autoconf' | head -1)

The autoconf in the Ubuntu desktop system is of version 2.69. It is clearly not compatible.

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0:00.10 /usr/bin/make -f client.mk -s
 0:00.19 TEST-PASS | check-sync-dirs.py | /home/antkong/wd/mozilla-central/js/src/build <= /home/antkong/wd/mozilla-central/build
 0:00.19 Generating /home/antkong/wd/mozilla-central/configure using autoconf
 0:00.26 build/autoconf/acwinpaths.m4:10: error: defn: undefined macro: AC_OUTPUT_FILES
 0:00.26 build/autoconf/acwinpaths.m4:10: the top level
 0:00.26 autom4te: /usr/bin/m4 failed with exit status: 1
 0:00.26 make[1]: *** [/home/antkong/wd/mozilla-central/configure] Error 1
 0:00.26 make: *** [build] Error 2
 0:00.27 0 compiler warnings present.

Solution: install autoconf-2.13

Ownership Rule Exception

Normally an observer or a delegate owner should not hold a strong reference to a callback or a delegate.

The two well-known exceptions are: an NSURLConnection ownes its delegate while the connection is running, and an NSTimer ownes its target while the timer is valid