From c54c16f13d819ef8acf9357e511e31b217c9eb09 Mon Sep 17 00:00:00 2001
From: Dimitri Papadopoulos
 <3234522+DimitriPapadopoulos@users.noreply.github.com>
Date: Sun, 19 Oct 2025 21:58:52 +0200
Subject: [PATCH] Proper compiler options from pkg-config

When installed a library on macOS using Homebrew, headers and libraries
might be installed outsode standard search paths. Use `pkg-config` to
retrieve proper search paths.
---
 setup.py | 33 +++++++++++++++++++++++++++------
 1 file changed, 27 insertions(+), 6 deletions(-)

diff --git a/setup.py b/setup.py
index 292e69b..cf4dfa1 100644
--- a/setup.py
+++ b/setup.py
@@ -1,5 +1,25 @@
 from os import environ
-from setuptools import setup, Extension  # type: ignore
+from setuptools import setup, Extension  # type: ignore[import-untyped]
+
+
+def pkgconfig(package, kw):
+    result = subprocess.run(
+        ["pkg-config", "--cflags", "--libs", package],
+        capture_output=True,
+        text=True,
+    )
+    if result.returncode == 0:
+        mapping = {
+            '-I': 'include_dirs',
+            '-L': 'library_dirs',
+            '-l': 'libraries',
+        }
+        for token in result.stdout.strip().split():
+            option = token[:2]
+            if option in mapping:
+                kw.setdefault(mapping[option], []).append(token[2:])
+    return kw
+
 
 extra_compile_args = ["-std=c99"]
 extra_link_args = []
@@ -7,23 +27,24 @@
 if environ.get("COVERAGE_BUILD"):
     extra_compile_args.extend(["--coverage", "-g", "-O0"])
     extra_link_args.extend(["--coverage"])
-    
+
+extra_kwargs = {'include_dirs': ["src/"]}
+extra_kwargs = pkgconfig('gmp', extra_kwargs)
+
 curvemath = Extension(
     "fastecdsa.curvemath",
-    include_dirs=["src/"],
-    libraries=["gmp"],
     sources=["src/curveMath.c", "src/curve.c", "src/point.c"],
     extra_compile_args=extra_compile_args,
     extra_link_args=extra_link_args,
+    **extra_kwargs,
 )
 
 _ecdsa = Extension(
     "fastecdsa._ecdsa",
-    include_dirs=["src/"],
-    libraries=["gmp"],
     sources=["src/_ecdsa.c", "src/curveMath.c", "src/curve.c", "src/point.c"],
     extra_compile_args=extra_compile_args,
     extra_link_args=extra_link_args,
+    **extra_kwargs,
 )
 
 setup(