Compiling on Snow Leopard: C and C++ compilers are different

Question

I am trying to compile Icecat on a 32bit iMac with Snow Leopard. I've installed the latest versions of Xcode, Tigerbrew, Yasm, Python 2.7, Python 3.5, and PIP (and I'm using Autoconf2.13).

I'm able to get up to the configure part, and then when I run this:

../configure --with-l10n-base=../l10n --enable-official-branding

I get the following error:

configure: error: Your C and C++ compilers are different. You need to use the same compiler.

My GCC, G++ versions are both 4.2.1 when I query them with --version

I've scoured the internet for related things but I can't for the life of me figure out how to fix this.

Here is the link I'm following:

https://libreplanet.org/wiki/Group:IceCat/Compile_and_package/build_52.3.0_on_macOS_10.13_High_Sierra

Any help is appreciated.