At least with 2.7 and 3.2, each argument is output on a separate line;
the results are identical, and the resulting newline messes up the
AC_SUBST.

--- origsrc/gobject-introspection-1.36.0/m4/python.m4	2012-12-18 10:27:16.000000000 -0600
+++ src/gobject-introspection-1.36.0/m4/python.m4	2013-08-04 22:06:23.578220400 -0500
@@ -64,7 +64,7 @@ AC_DEFUN([AM_CHECK_PYTHON_LIBS],
 AC_MSG_CHECKING(for libraries required to link against libpython)
 dnl deduce PYTHON_LIBS
 if test "x$PYTHON_LIBS" = x; then
-	PYTHON_LIBS=`$PYTHON-config --ldflags --libs`
+	PYTHON_LIBS=`$PYTHON-config --libs`
 fi
 AC_SUBST(PYTHON_LIBS)
 dnl check if libpython exist: