c++ -pipe -O2 -fno-strict-aliasing -pipe -o imfexamples main.o drawImage.o rgbaInterfaceExamples.o rgbaInterfaceTiledExamples.o generalInterfaceExamples.o lowLevelIoExamples.o previewImageExamples.o generalInterfaceTiledExamples.o -pthread  -L/usr/local/lib /usr/local/lib/libImath.so -L/usr/ports/graphics/OpenEXR/work/openexr-1.6.0/IlmImf /usr/local/lib/libIlmImf.so /usr/local/lib/libHalf.so /usr/local/lib/libIlmThread.so /usr/local/lib/libIex.so -pthread -lz   -Wl,--rpath -Wl,/usr/local/lib -Wl,--rpath -Wl,/usr/local/lib
/usr/bin/ld: warning: libHalf.so.4, needed by /usr/local/lib/libIlmImf.so, may conflict with libHalf.so.6
/usr/bin/ld: warning: libIex.so.4, needed by /usr/local/lib/libIlmImf.so, may conflict with libIex.so.6
/usr/bin/ld: warning: libIlmThread.so.4, needed by /usr/local/lib/libIlmImf.so, may conflict with libIlmThread.so.6
generalInterfaceExamples.o(.text+0x5da): In function `writeGZ2(char const*, half const*, float const*, int, int, Imath::Box<Imath::Vec2<int> > const&)':
: undefined reference to `Imf::Channel::Channel(Imf::PixelType, int, int, bool)'
generalInterfaceExamples.o(.text+0x604): In function `writeGZ2(char const*, half const*, float const*, int, int, Imath::Box<Imath::Vec2<int> > const&)':
: undefined reference to `Imf::Channel::Channel(Imf::PixelType, int, int, bool)'
generalInterfaceExamples.o(.text+0x797): In function `writeGZ1(char const*, half const*, float const*, int, int)':
: undefined reference to `Imf::Channel::Channel(Imf::PixelType, int, int, bool)'
generalInterfaceExamples.o(.text+0x7c1): In function `writeGZ1(char const*, half const*, float const*, int, int)':
: undefined reference to `Imf::Channel::Channel(Imf::PixelType, int, int, bool)'
generalInterfaceTiledExamples.o(.text+0x28c): In function `writeTiled1(char const*, Imf::Array2D<GZ>&, int, int, int, int)':
: undefined reference to `Imf::Channel::Channel(Imf::PixelType, int, int, bool)'
generalInterfaceTiledExamples.o(.text+0x2b6): more undefined references to `Imf::Channel::Channel(Imf::PixelType, int, int, bool)' follow
gmake[1]: *** [imfexamples] Error 1
gmake[1]: Leaving directory `/usr/ports/graphics/OpenEXR/work/openexr-1.6.0/IlmImfExamples'
gmake: *** [all-recursive] Error 1
*** Error code 2

Stop in /usr/ports/graphics/OpenEXR.
** Command failed [exit code 1]: /usr/bin/script -qa /tmp/portupgrade.45387.0 env UPGRADE_TOOL=portupgrade UPGRADE_PORT=OpenEXR-1.4.0 UPGRADE_PORT_VER=1.4.0 make
** Fix the problem and try again.
** Listing the failed packages (*:skipped / !:failed)
        ! graphics/OpenEXR (OpenEXR-1.4.0)      (linker error)
--->  Packages processed: 0 done, 0 ignored, 0 skipped and 1 failed