fix sdist option

Author: WillAyd

python/meson.options

@@ -96,6 +96,7 @@ option(
     'sdist',
     type: 'boolean',
     description: 'Build a Python source distribution',
+    value: false,
 )
 
 option(

python/pyarrow/meson.build

@@ -472,15 +472,17 @@ py.install_sources(
     subdir: 'pyarrow/include/arrow/python',
 )
 
-arrow_header_dir = arrow_dep.get_variable(
-    pkgconfig: 'includedir',
-    cmake: 'PACKAGE_INCLUDE_DIRS',
-) / 'arrow'
-
-install_subdir(
-    arrow_header_dir,
-    install_dir: py.get_install_dir() / 'pyarrow' / 'include',
-)
+if not get_option('sdist')
+    arrow_header_dir = arrow_dep.get_variable(
+        pkgconfig: 'includedir',
+        cmake: 'PACKAGE_INCLUDE_DIRS',
+    ) / 'arrow'
+
+    install_subdir(
+        arrow_header_dir,
+        install_dir: py.get_install_dir() / 'pyarrow' / 'include',
+    )
+endif
 
 py.install_sources(
     files('src/arrow/python/vendored/pythoncapi_compat.h'),