--- a/configure.in
+++ b/configure.in
@@ -632,14 +632,14 @@ if test "$class_driver" = "no" && test "
    fi
 fi
 
-SAVE_CPPFLAGS="$CPPFLAGS"
+SAVE_CFLAGS="$CFLAGS"
 CFLAGS=`python-config --includes`
-if [ $? -eq 0 ] 
+if test $? -eq 0
 then
    echo $FLAGS
 else
 CFLAGS=`python3-config --includes`
-   if [ $? -eq 0 ]
+   if test $? -eq 0
    then
    echo $FLAGS
    fi
@@ -659,7 +659,7 @@ if test "$class_driver" = "no" && test "
    AS_IF([test "x$FOUND_HEADER" != "xyes"],
           [AC_MSG_ERROR([cannot find python-devel support], 6)])
 fi
-CFLAGS="$save_CFLAGS"
+CFLAGS="$SAVE_CFLAGS"
 
 if test "$hpijs_only_build" = "no" && test "$scan_build" = "yes" && test "$hpcups_only_build" = "no"; then
    AC_CHECK_LIB([sane], [sane_open], [LIBS="$LIBS"], [AC_MSG_ERROR([cannot find sane-backends-devel support (or --disable-scan-build)], 12)])