fix parallel build

Makefile.am

@@ -2,9 +2,13 @@
 # This file is part of the UniSet library                                  #
 ############################################################################
 
-SUBDIRS=IDL src lib include Utilities extensions docs
+FIRSTSUBDIRS=IDL
+SUBDIRS=. src lib include Utilities extensions docs
 
 include $(top_builddir)/conf/common.mk
 
 pkgconfigdir 	= $(libdir)/pkgconfig
 pkgconfig_DATA 	= libUniSet.pc
+
+all-local:
+	$(MAKE) -C $(FIRSTSUBDIRS)

conf/libuniset.spec

@@ -93,9 +93,7 @@ Libraries needed to develop for uniset extensions
 %configure --disable-docs --disable-static
 %endif
 
-# Hack to make IDL first
-%make -C IDL
-%make_build || %make
+%make_build
 
 %install
 %makeinstall_std