Hope that's enough.

************************ using boost .138

************************ compiler gcc 4.2

i686-apple-darwin9-gcc-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5572) (dot 10.2)
Copyright (C) 2007 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

************************ FILE user-config.jam:

# Boost.Build Configuration
# Automatically generated by Boost configure

# Compiler configuration
using darwin : 4.0.1~iphone
   :
/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc-4.2 -arch arm
   : <striper>
   : <architecture>arm <target-os>iphone <macosx-version>iphone-3.0
   ;
using darwin : 4.0.1~iphonesim
   :
/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 -arch i386
   : <striper>
   : <architecture>x86 <target-os>iphone <macosx-version>iphonesim-3.0
   ;

************************ FILE makefile (handtuned)

BJAM=./tools/jam/src/bin.macosxx86/bjam -d 2
BJAM_USER_CONFIG=iphone30-user-config.jam

#####################
BJAM_CONFIG_IPHONE=toolset=darwin architecture=arm target-os=iphone --layout=system link=static macosx-version=iphone-3.0 define=_LITTLE_ENDIAN
BJAM_CONFIG_IPHONESIM=toolset=darwin architecture=x86 target-os=iphone --layout=system link=static macosx-version=iphonesim-3.0

prefix_IPHONE=<removedforprivacy>/boost-iphone-os30
prefix_IPHONESIM=<removedforprivacy>/boost-iphonesim-os30
#####################
BJAM_CONFIG=$(BJAM_CONFIG_IPHONE)
prefix     =     $(prefix_IPHONE)

exec_prefix=$(prefix)
libdir=$(exec_prefix)/lib
includedir=$(prefix)/include
LIBS= --with-serialization --with-filesystem --with-regex

all: .dummy
    @echo "$(BJAM) $(BJAM_CONFIG) --user-config=$(BJAM_USER_CONFIG) $(LIBS)"
    @$(BJAM) $(BJAM_CONFIG) --user-config=$(BJAM_USER_CONFIG) $(LIBS) || \
    echo "Not all Boost libraries built properly."

clean: .dummy
    rm -rf bin.v2

distclean: clean
    rm -rf Makefile config.log

check: .dummy
    @cd status && ../$(BJAM) $(BJAM_CONFIG) --user-config=../$(BJAM_USER_CONFIG) || echo "Some Boost regression tests failed. This is normal for many compilers."

install: .dummy
    @echo "$(BJAM) $(BJAM_CONFIG) --user-config=$(BJAM_USER_CONFIG) --prefix=$(prefix) --exec-prefix=$(exec_prefix) --libdir=$(libdir) --includedir=$(includedir) $(LIBS) install"
    @$(BJAM) $(BJAM_CONFIG) --user-config=$(BJAM_USER_CONFIG) --prefix=$(prefix) --exec-prefix=$(exec_prefix) --libdir=$(libdir) --includedir=$(includedir) $(LIBS) install || echo "Not all Boost libraries built properly."

.dummy: