+=head3 GMP specific functions
+
+These functions are only available if C<isl> has been compiled with C<GMP>
+support.
+
+Specific integer and rational values can be created from C<GMP> values using
+the following functions.
+
+ #include <isl/val_gmp.h>
+ __isl_give isl_val *isl_val_int_from_gmp(isl_ctx *ctx,
+ mpz_t z);
+ __isl_give isl_val *isl_val_from_gmp(isl_ctx *ctx,
+ const mpz_t n, const mpz_t d);
+
+The numerator and denominator of a rational value can be extracted as
+C<GMP> values using the following functions.
+
+ #include <isl/val_gmp.h>
+ int isl_val_get_num_gmp(__isl_keep isl_val *v, mpz_t z);
+ int isl_val_get_den_gmp(__isl_keep isl_val *v, mpz_t z);
+