prevent doubly passing our CFLAGS
--- libesmtp-1.0.6.orig/login/Makefile.in	2010-08-09 22:25:56.000000000 +0200
+++ libesmtp-1.0.6/login/Makefile.in	2014-06-05 22:27:23.719807056 +0200
@@ -227,7 +227,7 @@ top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
 INCLUDES = -I@srcdir@
 lib_LTLIBRARIES = sasl-login.la
-AM_CFLAGS = @CFLAGS@ @EXTRA_CFLAGS@
+AM_CFLAGS = @EXTRA_CFLAGS@
 sasl_login_la_SOURCES = client-login.c
 sasl_login_la_LDFLAGS = -module -avoid-version
 all: all-am