Description: idmap_prot.x is in the unix-libc-dev package
 Note that we also need idmap_prot.h from the same directory
 where idmap_prot.x
Index: illumos-corelibs/usr/src/lib/libidmap/Makefile.com
===================================================================
--- illumos-corelibs.orig/usr/src/lib/libidmap/Makefile.com	2012-10-08 04:25:39.000000000 +0400
+++ illumos-corelibs/usr/src/lib/libidmap/Makefile.com	2012-10-24 02:49:28.402895638 +0400
@@ -48,7 +48,7 @@
 SRCDIR =	../common
 $(LINTLIB):=	SRCS = $(SRCDIR)/$(LINTSRC)
 
-IDMAP_PROT_X =		$(SRC)/uts/common/rpcsvc/idmap_prot.x
+IDMAP_PROT_X =		/usr/include/rpcsvc/idmap_prot.x
 
 CFLAGS +=	$(CCVERBOSE)
 CPPFLAGS +=	-D_REENTRANT -I$(SRCDIR)