Problems building MesaLib on NetBSD-8

[Dave Tyson <dtyson%anduin.org.uk@localhost>]

I have been trying to get graphics/MesaLib to install under NetBSD-8 and 
seem to be having problems with configure not finding some components 
despite them being present.  This is a very recent pkgsrc-current 
against a recent NetBSD-8 snapshot. I am using the built-in X stuff.

Running make results in configure crashing out complaining about 
dri3proto not being found:

....
checking for SHA1Init... yes
checking for CC_SHA1_Init... no
checking for wincrypt.h... no
checking for SHA1Init in -lmd... no
checking for LIBSHA1... no
checking for nettle_sha1_init in -lnettle... no
checking for gcry_md_open in -lgcrypt... no
checking for SHA1_Init in -lcrypto... yes
checking for OPENSSL... no
checking for SHA1 implementation... libc
checking for LIBUDEV... no
checking for LIBDEVQ... no
Please specify at least one package name on the command line.
--print-errors: not found
checking for GLPROTO... yes
checking for DRI2PROTO... yes
checking for DRI3PROTO... no
configure: error: Package requirements (dri3proto >= 1.0) were not met:

Package 'dri3proto', required by 'virtual:world', not found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables DRI3PROTO_CFLAGS
and DRI3PROTO_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.
*** Error code 1

Stop.
make[1]: stopped in /usr/pkgsrc/graphics/MesaLib
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/graphics/MesaLib

However dri3proto is present:

root(dellpc)MesaLib$ pkg-config --modversion dri3proto
1.0

I have tried using the environmental variables to override the check and 
that works but then configure reports more things missing which are 
actually present. Again these problems can be worked around by 
environmental overrides but ultimately the build flops out during 
compilation of some the the drm stuff as that fails to find intel_aub.h 
despite that having been installed by the libdrm package.

I've had a look in the configure script and cannot see any obvious 
issue... Has anyone tested this stuff recently or got fixes to 
workaround the problems?

(I want to do some testing with the kde 5 stuff and kwayland needs the 
EGL stuff provided by MesaLib)

Cheers,
Dave

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