--- a/configure.ac	Fri May 02 21:04:20 2014 +0200
+++ b/configure.ac	Fri May 02 23:14:50 2014 +0200
@@ -27,7 +27,6 @@
 dnl Try to find GNU install
 AC_CHECK_PROG(INSTALL, ginstall, ginstall)
 AC_CHECK_PROG(INSTALL, install, install)
-dnl AC_PROG_MAKE_SET
 AC_CHECK_PROG(TAR, tar, tar)
 
 #
@@ -40,11 +39,12 @@
   AC_MSG_ERROR(libmosquitto not found)
 fi
 
+
+WIRINGPI=No
 AC_CHECK_LIB(wiringPi,wiringPiSetup,result=yes,result=no)
 if test "$result" = "yes"; then
   LIBS="$LIBS -lwiringPi -lwiringPiDev"
-else
-  AC_MSG_ERROR(libwiringPi not found)
+  AC_CHECK_HEADERS(wiringPi.h,WIRINGPI=Yes,WIRINGPI=No)
 fi
 
 
@@ -80,6 +80,7 @@
 
     Version : ............ ${VERSION}
     Main directory : ..... ${prefix}
+    WiringPi : ........... ${WIRINGPI}
 
   Now type 'make' and 'sudo make install'
 ])