fails to install

[l-yampolsky]

~/sabre-master$ make
gcc -Wall -pedantic -DVERSION=1.00 -O3 -c src/barcode.c
FATAL:/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../libexec/as/x86_64/as: I don't understand 'm' flag!
make: *** [barcode.o] Error 1

Any suggestions?
I also heard that sable requires something called zlib - is this the reason for this error? Where and how do I get zlib?

Thanks!