When packaging PostgreSQL I needed to pass a number of compiler flags but unfortunately there seems to be no way to do it currently. Flags like these, for example: -Xsepgsql -fPIC -pie -I/usr/include/mit-krb5 -Wl,--as-needed -L/usr/lib/mit-krb5 -L/usr/lib/i386/mit-krb5 It would be nice if the autotools plugin became capable of handling compiler flags like configflags: currently does.