TOSTRING issue in src/metadata.c

[JonathanBerrew]

Hello,
I realized the TOSTRING function is defined in const.h:

#ifndef NAMEVER
#define NAMEVERSION "mod_auth_openidc-0.0.0"
#else
#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)
#define NAMEVERSION TOSTRING(NAMEVER)
#endif

But is only defined if NAMEVER is defined. If NAMEVER isn't defined, TOSTRING isn't defined and in metadata.c:

#define OIDC_METADATA_PROVIDER_SET(member, value, rv)                                                                  \
	if (value != NULL) {                                                                                           \
		rv = oidc_cfg_provider_##member##_set(r->pool, provider, value);                                       \
		if (rv != NULL)                                                                                        \
			oidc_error(r, "oidc_cfg_provider_%s_set: %s", TOSTRING(member), rv);                           \
	}

#define OIDC_METADATA_PROVIDER_SET_INT(provider, member, ivalue, rv)                                                   \
	if (ivalue != OIDC_CONFIG_POS_INT_UNSET) {                                                                     \
		rv = oidc_cfg_provider_##member##_set(r->pool, provider, ivalue);                                      \
		if (rv != NULL)                                                                                        \
			oidc_error(r, "oidc_cfg_provider_%s_set: %s", TOSTRING(member), rv);                           \
	}

TOSTRING is not working properly, and I'm getting error when compiling under Windows without NAMEVER defined.
To fix this, I add manually

#define STRINGIFY(x) #x
#define TOSTRING(x) STRINGIFY(x)

outside of the ifndef/else.
Am I building it wrongly?