diff -up phpy-1.0.8/config.m4.old phpy-1.0.8/config.m4
--- phpy-1.0.8/config.m4.old	2024-09-06 06:58:54.678666785 +0200
+++ phpy-1.0.8/config.m4	2024-09-06 06:59:02.749976475 +0200
@@ -68,9 +68,12 @@ if test "$PHP_PHPY" != "no"; then
     PHP_EVAL_LIBLINE($PYTHON_LIBS, PHPY_SHARED_LIBADD)
     PHP_EVAL_INCLINE($PYTHON_CFLAGS)
   else
-    PHP_PYTHON_CONFIG="python3-config"
-    GET_PYTHON_INCLUDES()
-    GET_PYTHON_LDFLAGS()
+    dnl modern version use python3-embed, old (<= 3.6) use python3
+    PKG_CHECK_MODULES([PYTHON], [python3-embed],,
+      [PKG_CHECK_MODULES([PYTHON], [python3])]
+    )
+    PHP_EVAL_LIBLINE($PYTHON_LIBS, PHPY_SHARED_LIBADD)
+    PHP_EVAL_INCLINE($PYTHON_CFLAGS)
   fi
 
   PHP_REQUIRE_CXX()