Bug in configure script for openexr-2.1.0 on ubuntu 12.0.4 LTS

Howdy folks.

I'm building openexr-2.1.0 in a non-standard location, on ubuntu 12.0.4
LTS.  I have an environment variable, EMLDNEEDS_ROOT, which is set to the
install location for everything, using --prefix. I have a build of libz in
this location as well. Here's my config line:

./configure --prefix=$EMLDNEEDS_ROOT --with-ilmbase-prefix=$EMLDNEEDS_ROOT
--with-pic --enable-static --disable-shared LDFLAGS=-L$EMLDNEEDS_ROOT/lib
CFLAGS=-I$EMLDNEEDS_ROOT/include

The bug is that it doesn't seem to be respecting LDFLAGS or CFLAGS when
building, specifically with respect to libz. An example error:

encino@chorvath:~/depot/bundles/EmldNeeds-1.0.2-Apr16_2014/sandbox/openexr/openexr-2.1.0$
make
Making all in config
make[1]: Entering directory
`/home/encino/depot/bundles/EmldNeeds-1.0.2-Apr16_2014/sandbox/openexr/openexr-2.1.0/config'
make  all-am
make[2]: Entering directory
`/home/encino/depot/bundles/EmldNeeds-1.0.2-Apr16_2014/sandbox/openexr/openexr-2.1.0/config'
make[2]: Leaving directory
`/home/encino/depot/bundles/EmldNeeds-1.0.2-Apr16_2014/sandbox/openexr/openexr-2.1.0/config'
make[1]: Leaving directory
`/home/encino/depot/bundles/EmldNeeds-1.0.2-Apr16_2014/sandbox/openexr/openexr-2.1.0/config'
Making all in IlmImf
make[1]: Entering directory
`/home/encino/depot/bundles/EmldNeeds-1.0.2-Apr16_2014/sandbox/openexr/openexr-2.1.0/IlmImf'
make  all-am
make[2]: Entering directory
`/home/encino/depot/bundles/EmldNeeds-1.0.2-Apr16_2014/sandbox/openexr/openexr-2.1.0/IlmImf'
/bin/bash ../libtool --tag=CXX   --mode=compile g++ -DHAVE_CONFIG_H -I.
-I../config
-I/home/encino/depot/bundles/EmldNeeds-1.0.2-Apr16_2014//include/OpenEXR
-I.. -I../config   -pipe -g -O2 -MT ImfZipCompressor.lo -MD -MP -MF
.deps/ImfZipCompressor.Tpo -c -o ImfZipCompressor.lo ImfZipCompressor.cpp
libtool: compile:  g++ -DHAVE_CONFIG_H -I. -I../config
-I/home/encino/depot/bundles/EmldNeeds-1.0.2-Apr16_2014//include/OpenEXR
-I.. -I../config -pipe -g -O2 -MT ImfZipCompressor.lo -MD -MP -MF
.deps/ImfZipCompressor.Tpo -c ImfZipCompressor.cpp  -fPIC -DPIC -o
ImfZipCompressor.o
ImfZipCompressor.cpp:46:18: fatal error: zlib.h: No such file or directory
 #include <zlib.h>
                  ^
compilation terminated.

I can fix this by futzing with the makefiles directly, but it does seem
like a build bug.

Chris

-- 
I think this situation absolutely requires that a really futile and stupid
gesture be done on somebody's part. And we're just the guys to do it.

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