Andreas Tille wrote: > The configure faulure is rather: > > checking google/sparse_hash_set usability... no > checking google/sparse_hash_set presence... yes > configure: WARNING: google/sparse_hash_set: present but cannot be compiled
> +export DEB_CXXFLAGS_MAINT_APPEND=-std=c++98 The problem is exactly the opposite -- configure.ac is enforcing c++98 while these headers assume a newer standard. The configure check should pass if you remove this line in configure.ac: | AC_SUBST(CXXFLAGS, "-std=c++98 -O3") However, you may encounter compilation errors if the software is not yet ready for GCC's default C++ standard.