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From https://github.com/scipy/scipy/pull/20135

From 53796772ed735c1564863fc7ca8d902acb628167 Mon Sep 17 00:00:00 2001
From: Ralf Gommers <ralf.gommers@gmail.com>
Date: Thu, 22 Feb 2024 09:10:46 +0100
Subject: [PATCH] MAINT: interpolate: define `F_INT` as `int` rather than
 `npy_int32`

This fixes an incompatible pointer issue that shows up as a warning in
Windows CI jobs, and is reported to break the build with GCC 14 on
Fedora 40 in gh-19993.

Using `#define F_INT int` is done in several other submodules; this
was the only instance of using `npy_int32`.

Closes gh-19993
---
 scipy/interpolate/src/_fitpackmodule.c | 4 ++--
 scipy/interpolate/src/fitpack.pyf      | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/scipy/interpolate/src/_fitpackmodule.c b/scipy/interpolate/src/_fitpackmodule.c
index 0e913d1c7e43..dc79b2b28833 100644
--- a/scipy/interpolate/src/_fitpackmodule.c
+++ b/scipy/interpolate/src/_fitpackmodule.c
@@ -28,8 +28,8 @@ static PyObject *fitpack_error;
 
 #else
 
-#define F_INT npy_int32
-#define F_INT_NPY NPY_INT32
+#define F_INT int
+#define F_INT_NPY NPY_INT
 #define F_INT_MAX NPY_MAX_INT32
 #if NPY_BITSOF_SHORT == 32
 #define F_INT_PYFMT   "h"
diff --git a/scipy/interpolate/src/fitpack.pyf b/scipy/interpolate/src/fitpack.pyf
index 08cb0c141c98..a9535a83f479 100644
--- a/scipy/interpolate/src/fitpack.pyf
+++ b/scipy/interpolate/src/fitpack.pyf
@@ -16,7 +16,7 @@ python module dfitpack ! in
 #ifdef HAVE_ILP64
 typedef npy_int64 F_INT;
 #else
-typedef npy_int32 F_INT;
+typedef int F_INT;
 #endif
 
 static double dmax(double* seq, F_INT len) {