Can't compile boost_libiostreams for iOS

[RomainQuidet]

Hi, I'm discovering Mason usage, so maybe I'm wrong. I made a simple Makefile for testing purpose. I can get geojson 0.4.0 build for iOS and the static lib has the 4 slices arm i386 etc. But when I try the same with boost iostreams lib, it fails by building all slices for x86_64

input file lib-ios-arm64/libboost_iostreams.a is not a fat file Non-fat file: lib-ios-arm64/libboost_iostreams.a is architecture: x86_64

• Creating Universal Binary... fatal error: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/lipo: lib-isim-i386/libboost_iostreams.a and lib-isim-x86_64/libboost_iostreams.a have the same architectures (x86_64) and can't be in the same fat output file make: *** [all] Error 1

Also I can't get the min ios version updated with MASON_PLATFORM_VERSION, it always stays at 8.0.

Here is my makefile

============================= MASON_PLATFORM=ios export MASON_PLATFORM MASON_PLATFORM_VERSION=9.0 export MASON_PLATFORM_VERSION MASON ?= .mason/mason

all: #${MASON} install boost_libiostreams 1.63.0 ${MASON} install geojson 0.4.0

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