opt libcpp 1 "build with llvm with libc++ instead of libstdc++ when using clang"
opt llvm-assertions 1 "build LLVM with assertions"
opt debug 1 "build with extra debug fun"
-opt ratchet-bench 0 "ratchet benchmarks"
opt fast-make 0 "use .gitmodules as timestamp for submodule deps"
opt ccache 0 "invoke gcc/clang via ccache to reuse object files between builds"
opt local-rust 0 "use an installed rustc rather than downloading a snapshot"
probe CFG_JAVAC javac
probe CFG_ANTLR4 antlr4
probe CFG_GRUN grun
+probe CFG_FLEX flex
+probe CFG_BISON bison
probe CFG_PANDOC pandoc
probe CFG_PDFLATEX pdflatex
probe CFG_XELATEX xelatex