diff -Nurp libesmtp-1.0.6.org/crammd5/Makefile.am libesmtp-1.0.6/crammd5/Makefile.am
--- libesmtp-1.0.6.org/crammd5/Makefile.am	2010-08-08 23:45:57.000000000 +0800
+++ libesmtp-1.0.6/crammd5/Makefile.am	2014-11-17 11:17:21.663624295 +0800
@@ -2,7 +2,7 @@
 
 libdir = @plugindir@
 
-INCLUDES = -I@srcdir@
+INCLUDES = -I@srcdir@ -I@srcdir@/../
 AM_CFLAGS = @CFLAGS@ @EXTRA_CFLAGS@
 
 lib_LTLIBRARIES = sasl-cram-md5.la
diff -Nurp libesmtp-1.0.6.org/login/Makefile.am libesmtp-1.0.6/login/Makefile.am
--- libesmtp-1.0.6.org/login/Makefile.am	2010-08-08 23:45:56.000000000 +0800
+++ libesmtp-1.0.6/login/Makefile.am	2014-11-17 11:17:54.339623018 +0800
@@ -2,7 +2,7 @@
 
 libdir = @plugindir@
 
-INCLUDES = -I@srcdir@
+INCLUDES = -I@srcdir@ -I@srcdir@/../
 
 lib_LTLIBRARIES = sasl-login.la
 AM_CFLAGS = @CFLAGS@ @EXTRA_CFLAGS@
diff -Nurp libesmtp-1.0.6.org/ntlm/Makefile.am libesmtp-1.0.6/ntlm/Makefile.am
--- libesmtp-1.0.6.org/ntlm/Makefile.am	2010-08-08 23:45:56.000000000 +0800
+++ libesmtp-1.0.6/ntlm/Makefile.am	2014-11-17 11:18:10.551622385 +0800
@@ -2,7 +2,7 @@
 
 libdir = @plugindir@
 
-INCLUDES = -I@srcdir@
+INCLUDES = -I@srcdir@ -I@srcdir@/../
 AM_CFLAGS = @CFLAGS@ @EXTRA_CFLAGS@
 
 lib_LTLIBRARIES = sasl-ntlm.la
diff -Nurp libesmtp-1.0.6.org/plain/Makefile.am libesmtp-1.0.6/plain/Makefile.am
--- libesmtp-1.0.6.org/plain/Makefile.am	2010-08-08 23:45:54.000000000 +0800
+++ libesmtp-1.0.6/plain/Makefile.am	2014-11-17 11:18:33.355621494 +0800
@@ -2,7 +2,7 @@
 
 libdir = @plugindir@
 
-INCLUDES = -I@srcdir@
+INCLUDES = -I@srcdir@ -I@srcdir@/../
 AM_CFLAGS = @CFLAGS@ @EXTRA_CFLAGS@
 
 lib_LTLIBRARIES = sasl-plain.la