I just tried to build -current, checked out today.

The build failed in phase

dependall ===> sys/arch/alpha/stand/netboot

with

#    create  netboot/dev_net.d
CC=/local/netbsd/current/alpha/tools/bin/alpha--netbsd-gcc 
/local/netbsd/current/alpha/tools/bin/nbmkdep -f dev_net.d -- 
-DUNIFIED_BOOTBLOCK  -DHEAP_LIMIT="(0x20000000 + 262144)"  -DBOOT_ECOFF 
-DBOOT_ELF64 -DSUPPORT_DHCP  -DBOOT_TYPE_NAME='"Network"'  -nostdinc 
-I/local/netbsd/current/alpha/obj/sys/arch/alpha/stand/netboot 
-D_STANDALONE 
-I/source/current/src/sys/arch/alpha/stand/netboot/../../../.. 
-DNETBSD_VERS='"3.99.15"' 
-I/source/current/src/sys/arch/alpha/stand/netboot/../..  -nostdinc 
-isystem /local/netbsd/current/alpha/dest/usr/include 
-I/source/current/src/sys/arch/alpha/stand/netboot/../../../../lib/libkern/../../../common/lib/libc/quad 
-I/source/current/src/sys/arch/alpha/stand/netboot/../../../../lib/libkern/../../../common/lib/libc/string 
-I/source/current/src/sys/arch/alpha/stand/netboot/../../../../lib/libkern/../../../common/lib/libc/arch/alpha/string 
  /source/current/src/sys/arch/alpha/stand/netboot/dev_net.c
In file included from 
/source/current/src/sys/arch/alpha/stand/netboot/dev_net.c:59:
/source/current/src/sys/lib/libsa/net.h:46:20: iodesc.h: No such file or 
directory
nbmkdep: compile failed.