Mpc does not provide mpc.h directly anymore. Instead, it provides mpc.h.in https://gitlab.inria.fr/mpc/mpc/-/commit/9904e8d7df3da18af1d5286e82b3b6ac5b24d884 [https://gitlab.inria.fr/assets/twitter_card-570ddb06edf56a2312253c5872489847a0f385112ddbcd71ccfa1570febab5d2.jpg]<https://gitlab.inria.fr/mpc/mpc/-/commit/9904e8d7df3da18af1d5286e82b3b6ac5b24d884> Create mpc.h and mpc-impl.h from mpc.h.in and mpc-impl.h.in by configure. (9904e8d7) · Commits · mpc / mpc · GitLab<https://gitlab.inria.fr/mpc/mpc/-/commit/9904e8d7df3da18af1d5286e82b3b6ac5b24d884> * src/mpc.h: Move to... * src/mpc.h.in: ...this. Substitute HAVE_COMPLEX_H depending on the configure test. Use HAVE_COMPLEX_H and _Complex_I. * src/mpc-impl.h: Move to... * src/mpc-impl.h.in: ...this. Substitute HAVE_COMPLEX_H depending on the... gitlab.inria.fr Please fix this asap