Description: add quotes to prevent build failure with non empty CPPFLAGS
Author: Sebastian Ramacher <s.ramacher@gmx.at>
Last-Update: 2011-12-17

--- a/m4/ax_boost_python.m4
+++ b/m4/ax_boost_python.m4
@@ -63,7 +63,7 @@ ac_cv_boost_python,
  AC_LANG_CPLUSPLUS
  CPPFLAGS_SAVE=$CPPFLAGS
  if test x$PYTHON_INCLUDE_DIR != x; then
-   CPPFLAGS=-I$PYTHON_INCLUDE_DIR $CPPFLAGS
+   CPPFLAGS="-I$PYTHON_INCLUDE_DIR $CPPFLAGS"
  fi
  AC_COMPILE_IFELSE(AC_LANG_PROGRAM([[
  #include <boost/python/module.hpp>