Linking CXX executable maketx
cd /var/tmp/portage/media-libs/openimageio-1.3.5/work/openimageio-1.3.5_build/maketx && /usr/bin/cmake -E cmake_link_script CMakeFiles/maketx.dir/link.txt --verbose=1
/usr/bin/i686-pc-linux-gnu-g++   -O2 -march=core2 -mtune=generic -mfpmath=both -msse4.1 -fomit-frame-pointer -pipe    -Wl,-O1 -Wl,--as-needed CMakeFiles/maketx.dir/maketx.cpp.o  -o maketx -rdynamic -lHalf -lIex -lImath -lIlmThread -lpthread ../libOpenImageIO/libOpenImageIO.so.1.3.5 -lboost_filesystem-mt -lboost_regex-mt -lboost_system-mt -lboost_thread-mt -ldl -lssl -lcrypto -lfreetype -lHalf -lIex -lImath -lIlmThread -lpthread -lpng -lz -ltiff -ljpeg -lz -ltiff -ljpeg -lwebp -lIlmImf -lgif -lpugixml -Wl,-rpath,/var/tmp/portage/media-libs/openimageio-1.3.5/work/openimageio-1.3.5_build/libOpenImageIO: 
../libOpenImageIO/libOpenImageIO.so.1.3.5: undefined reference to `boost::thread::start_thread()'
../libOpenImageIO/libOpenImageIO.so.1.3.5: undefined reference to `boost::thread::join()'
collect2: ld returned 1 exit status
maketx/CMakeFiles/maketx.dir/build.make:115: recipe for target 'maketx/maketx' failed
make[2]: *** [maketx/maketx] Error 1