Build fails on macOS due to unknown warning options inherited-variadic-ctor and receiver-is-weak

I'm new to the project and tried to config/build in on macOS. I gleaned the build steps from the travis.yml file.

$ make
cd src/ && ( test -e Makefile || /usr/local/opt/qt5/bin/qmake -o Makefile /Users/mthe/valentina/src/src.pro CONFIG+=noDebugSymbols CONFIG+=no_ccache CONFIG+=checkWarnings ) && /Applications/Xcode.app/Contents/Developer/usr/bin/make -f Makefile
cd libs/ && ( test -e Makefile || /usr/local/opt/qt5/bin/qmake -o Makefile /Users/mthe/valentina/src/libs/libs.pro CONFIG+=noDebugSymbols CONFIG+=no_ccache CONFIG+=checkWarnings ) && /Applications/Xcode.app/Contents/Developer/usr/bin/make -f Makefile
cd qmuparser/ && ( test -e Makefile || /usr/local/opt/qt5/bin/qmake -o Makefile /Users/mthe/valentina/src/libs/qmuparser/qmuparser.pro CONFIG+=noDebugSymbols CONFIG+=no_ccache CONFIG+=checkWarnings ) && /Applications/Xcode.app/Contents/Developer/usr/bin/make -f Makefile
compiling ../../../../src/libs/qmuparser/stable.h
error: unknown warning option '-Winherited-variadic-ctor'; did you mean '-Wundefined-var-template'? [-Werror,-Wunknown-warning-option]
error: unknown warning option '-Wreceiver-is-weak'; did you mean '-Wreceiver-expr'? [-Werror,-Wunknown-warning-option]
make[3]: *** [obj/qmuparser/c++_x86_64.pch] Error 1
make[2]: *** [sub-qmuparser-make_first] Error 2
make[1]: *** [sub-libs-make_first] Error 2
make: *** [sub-src-make_first] Error 2

I tried using these 2 recently updated compilers:

$ clang++ -v
Apple LLVM version 8.1.0 (clang-802.0.42)
Target: x86_64-apple-darwin16.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

$ g++-6 -v
Using built-in specs.
COLLECT_GCC=g++-6
COLLECT_LTO_WRAPPER=/usr/local/Cellar/gcc/6.3.0_1/libexec/gcc/x86_64-apple-darwin16.3.0/6.3.0/lto-wrapper
Target: x86_64-apple-darwin16.3.0
Configured with: ../configure --build=x86_64-apple-darwin16.3.0 --prefix=/usr/local/Cellar/gcc/6.3.0_1 --libdir=/usr/local/Cellar/gcc/6.3.0_1/lib/gcc/6 --enable-languages=c,c++,objc,obj-c++,fortran --program-suffix=-6 --with-gmp=/usr/local/opt/gmp --with-mpfr=/usr/local/opt/mpfr --with-mpc=/usr/local/opt/libmpc --with-isl=/usr/local/opt/isl --with-system-zlib --enable-libstdcxx-time=yes --enable-stage1-checking --enable-checking=release --enable-lto --with-build-config=bootstrap-debug --disable-werror --with-pkgversion='Homebrew GCC 6.3.0_1' --with-bugurl=https://github.com/Homebrew/homebrew-core/issues --enable-plugin --disable-nls --enable-multilib
Thread model: posix
gcc version 6.3.0 (Homebrew GCC 6.3.0_1)

If I comment out these flags from common.pri, the build gets past the first compiler invocation (but fails later on due to something else, probably something related to my Qt version).

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