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But gdb's configure expects that information to be passed through the --with-libgmp-prefix switch. Was that a deliberate choice (I'm looking at commit 2c947d9bc2ff3b84f1676b83577fe1bba05b4a5f). When one is used to building gcc, it is a little odd to have to specify --with-libgmp-prefix instead of --with-gmp. The top-level configure lists this: --with-gmp=PATH specify prefix directory for the installed GMP package. Equivalent to --with-gmp-include=PATH/include plus --with-gmp-lib=PATH/lib And gdb's configure lists this: --with-libgmp-prefix[=DIR] search for libgmp in DIR/include and DIR/lib I'm wondering if we can reuse the top-level configure's --with-gmp option.