mupdf now builds C++ code and requires a compiler that supports -std=c++17, so zap COMPILER_LANGS=c. Also zap MODGCC4_ARCHS=armv7, which doesn't do what you think it does in this context (base-clang would still be picked up on armv7). mupdf on armv7 should be tested again before adding another workaround. ok kmos@ sthen@ (maintainer)