Hi,

currently exrdisplay does not compile with g++ 4.3, as the declaration of the getenv() function is missing:

<<<<<
g++-4.3 -DHAVE_CONFIG_H -I. -I. -I../config -I/usr/include/freetype2 -D_THREAD_SAFE -D_REENTRANT -I.. -DHAVE_CTL_INTERPRETER=0 -pthread -I/usr/include/OpenEXR     -pipe -g -Wall -O2 -c -o applyCtl.o applyCtl.cpp
applyCtl.cpp: In function ‘float displayVideoGamma()’:
applyCtl.cpp:86: error: ‘getenv’ was not declared in this scope
applyCtl.cpp: In function ‘Imf::Chromaticities<unnamed>::displayChromaticities()’:
applyCtl.cpp:125: error: ‘getenv’ was not declared in this scope

>>>>>

Attached there is a patch for exrdisplay/applyCtl.cpp that solves the problem, just including <cstdlib> is enough.

Please also note that a similar issue could be also in playexr/ctlToLut.cpp, and basically the same patch could be applied there too. (I miss the dependancies for compiling the CTL stuff, so I was not able to verify.)