check if freerdp-devel is installed and use it

configure.ac

@@ -43,6 +43,8 @@ then
   fi
 fi
 
+AS_IF([test "x$enable_freerdp" = "xyes"], [PKG_CHECK_MODULES(FREERDP, freerdp >= 0.8.1) ], [] )
+
 # checking for Xlib, Xfixes
 AC_CHECK_HEADER([X11/Xlib.h], [],
   [AC_MSG_ERROR([please install libx11-dev or libX11-devel])])

freerdp/Makefile.am

@@ -8,7 +8,7 @@ AM_CFLAGS = \
 
 INCLUDES = \
   -I$(top_srcdir)/common \
-  -I$(top_srcdir)/../freerdp/include/freerdp
+  $(FREERDP_CFLAGS)
 
 lib_LTLIBRARIES = \
   libxrdpfreerdp.la
@@ -16,4 +16,5 @@ lib_LTLIBRARIES = \
 libxrdpfreerdp_la_SOURCES = xrdp-freerdp.c
 
 libxrdpfreerdp_la_LIBADD = \
-  $(top_srcdir)/common/libcommon.la
+  $(top_srcdir)/common/libcommon.la \
+  $(FREERDP_LIBS)