Hi,
you should quote your arguments, for example:
AC_CHECK_LIB(IlmImf,ImfApplyLut,,[AC_MSG_ERROR([*** openexr dev lib not found ***])],)
AC_CHECK_HEADER(OpenEXR/half.h,
[OPENEXR_INCLUDES="-I$prefix/include/OpenEXR";
OPENEXR_LIBS='-lIlmImf -lImath -lIex -lHalf -lz'],
[AC_MSG_ERROR([*** openexr dev header half.h not found ***])])
There may be more problems, this is the first which I see.
Tell us whether this helped.
Stepan Kasal
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