build: add rule to generate fru-gen.hpp

fru-gen.hpp needs as input a YAML file. Enable this to be provided
via autotools configuration.

Change-Id: I586c14651840b6a9697a93261f79c2a48f14071f
Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
diff --git a/configure.ac b/configure.ac
index ae03a47..18fd1d0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12,6 +12,9 @@
 AC_PROG_INSTALL
 AC_PROG_MAKE_SET
 AC_PROG_LN_S
+AM_PATH_PYTHON([2.7],
+    [AC_SUBST([PYTHON], [echo "$PYTHON"])],
+    [AC_MSG_ERROR([Could not find python-2.7 installed...python-2.7 is required])])
 
 # Checks for libraries.
 AC_CHECK_LIB([mapper], [mapper_get_service])
@@ -51,6 +54,10 @@
     AC_SUBST([OESDK_TESTCASE_FLAGS], [$testcase_flags])
 )
 
+AS_IF([test "x$YAML_GEN" == "x"], [YAML_GEN="example.yaml"])
+FRUGEN="$PYTHON $srcdir/scripts/fru_gen.py -i $YAML_GEN"
+AC_SUBST(FRUGEN)
+
 # Create configured output
 AC_CONFIG_FILES([Makefile])
 AC_OUTPUT