build/pkgs/meson/spkg-configure.m4: Reject meson from inaccessible user scheme

Author: Matthias Koeppe

build/pkgs/meson/spkg-configure.m4

@@ -1,15 +1,20 @@
-SAGE_SPKG_CONFIGURE(
-    [meson], [
-        dnl scipy 1.11.2 needs meson >= 1.1.0
-        dnl contourpy needs meson >= 1.2.0
-        dnl meson_python needs meson >= 1.2.3 for Python >= 3.12
-        AC_CACHE_CHECK([for meson >= 1.2.3], [ac_cv_path_MESON], [
-        AC_PATH_PROGS_FEATURE_CHECK([MESON], [meson], [
-            meson_version=`$ac_path_MESON --version 2>&1`
-            AS_IF([test -n "$meson_version"], [
-                AX_COMPARE_VERSION([$meson_version], [ge], [1.2.3], [
-                    ac_cv_path_MESON="$ac_path_MESON"
-                    ac_path_MESON_found=:
+SAGE_SPKG_CONFIGURE([meson], [dnl
+    dnl scipy 1.11.2 needs meson >= 1.1.0
+    dnl contourpy needs meson >= 1.2.0
+    dnl meson_python needs meson >= 1.2.3 for Python >= 3.12
+    AC_CACHE_CHECK([for meson >= 1.2.3], [ac_cv_path_MESON], [dnl
+        dnl Do not accept meson installed in the default user scheme;
+        dnl it will not work in our venv because we set PYTHONUSERBASE
+        dnl in sage-env.
+        WITH_SAGE_PYTHONUSERBASE([dnl
+            AC_PATH_PROGS_FEATURE_CHECK([MESON], [meson], [dnl
+                AS_IF([meson_version=$($ac_path_MESON --version 2>&1)], [dnl
+                    AS_IF([test -n "$meson_version"], [dnl
+                        AX_COMPARE_VERSION([$meson_version], [ge], [1.2.3], [dnl
+                            ac_cv_path_MESON="$ac_path_MESON"
+                            ac_path_MESON_found=:
+                        ])
+                    ])
                 ])
             ])
         ])