save CFLAGS to save_CFLAGS, no CPPFLAGS.

diff --git a/configure.ac b/configure.ac
index 75a0e27..740ca34 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -68,7 +68,7 @@ AC_ARG_VAR([MATHLIBS],[The libraries required for mathematical functions, e.g. -
 if test "x$MATHLIBS" = "x"; then
        # We must not compile with -Wall -Werror here:
        # char *sqrt() conflicts with double sin(const double xx) in any case.
-       CFLAGS_save="$CPPFLAGS"
+       CFLAGS_save="$CFLAGS"
        CPPFLAGS_save="$CPPFLAGS"
        CPPFLAGS=""
        CFLAGS=""