Also check for Python platform-specific include directory

Python can be built to have two separate include directories: one for
platform-independent files and one for platform-specific files.  So
far, this has apparently never mattered for a PL/Python build.  But
with the new multi-arch Python packages in Debian and Ubuntu, this is
becoming the standard configuration on these platforms, so we must
check these directories separately to be able to build there.

Also add a bit of reporting in configure to be able to see better what
is going on with this.

1 files changed, 14 insertions, 3 deletions

diff --git a/configure b/configure
index 5fd7651812..6a89cca1f6 100755
--- a/configure
+++ b/configure
@@ -7454,12 +7454,23 @@ $as_echo_n "checking Python configuration directory... " >&6; }
 python_majorversion=`${PYTHON} -c "import sys; print(sys.version[0])"`
 python_version=`${PYTHON} -c "import sys; print(sys.version[:3])"`
 python_configdir=`${PYTHON} -c "import distutils.sysconfig; print(' '.join(filter(None,distutils.sysconfig.get_config_vars('LIBPL'))))"`
-python_includespec=`${PYTHON} -c "import distutils.sysconfig; print('-I'+distutils.sysconfig.get_python_inc())"`
-
-# This should be enough of a message.
 { $as_echo "$as_me:$LINENO: result: $python_configdir" >&5
 $as_echo "$python_configdir" >&6; }
 
+{ $as_echo "$as_me:$LINENO: checking Python include directories" >&5
+$as_echo_n "checking Python include directories... " >&6; }
+python_includespec=`${PYTHON} -c "
+import distutils.sysconfig
+a = '-I' + distutils.sysconfig.get_python_inc(False)
+b = '-I' + distutils.sysconfig.get_python_inc(True)
+if a == b:
+    print(a)
+else:
+    print(a + ' ' + b)"`
+{ $as_echo "$as_me:$LINENO: result: $python_includespec" >&5
+$as_echo "$python_includespec" >&6; }
+
+
 
 { $as_echo "$as_me:$LINENO: checking how to link an embedded Python application" >&5
 $as_echo_n "checking how to link an embedded Python application... " >&6; }