Found the following significant warnings:
  ../inst/include/CImg.h:25384:23: warning: unsequenced modification and access to 'right' [-Wunsequenced]
  ../inst/include/CImg.h:32973:35: warning: unsequenced modification and access to '_n2x' [-Wunsequenced]
  ../inst/include/CImg.h:32973:35: warning: multiple unsequenced modifications to '_n3x' [-Wunsequenced]
  ../inst/include/CImg.h:32973:35: warning: unsequenced modification and access to '_n1x' [-Wunsequenced]
  ../inst/include/CImg.h:32993:40: warning: unsequenced modification and access to '_n2x' [-Wunsequenced]
  ../inst/include/CImg.h:32993:40: warning: multiple unsequenced modifications to '_n3x' [-Wunsequenced]
  ../inst/include/CImg.h:32993:40: warning: unsequenced modification and access to '_n1x' [-Wunsequenced]
  ../inst/include/CImg.h:33013:35: warning: multiple unsequenced modifications to '_n2x' [-Wunsequenced]
  ../inst/include/CImg.h:33013:35: warning: unsequenced modification and access to '_n1x' [-Wunsequenced]
  ../inst/include/CImg.h:33027:40: warning: multiple unsequenced modifications to '_n2x' [-Wunsequenced]
  ../inst/include/CImg.h:33027:40: warning: unsequenced modification and access to '_n1x' [-Wunsequenced]
  ../inst/include/CImg.h:33045:35: warning: multiple unsequenced modifications to '_n2x' [-Wunsequenced]
  ../inst/include/CImg.h:33045:35: warning: unsequenced modification and access to '_n1x' [-Wunsequenced]
  ../inst/include/CImg.h:33056:40: warning: multiple unsequenced modifications to '_n2x' [-Wunsequenced]
  ../inst/include/CImg.h:33056:40: warning: unsequenced modification and access to '_n1x' [-Wunsequenced]
  ../inst/include/CImg.h:34069:19: warning: unsequenced modification and access to 'right' [-Wunsequenced]
  ../inst/include/CImg.h:35472:17: warning: multiple unsequenced modifications to '_n2x' [-Wunsequenced]
  ../inst/include/CImg.h:35472:17: warning: unsequenced modification and access to '_n1x' [-Wunsequenced]
  ../inst/include/CImg.h:35484:17: warning: unsequenced modification and access to '_n2x' [-Wunsequenced]
  ../inst/include/CImg.h:35484:17: warning: multiple unsequenced modifications to '_n3x' [-Wunsequenced]
  ../inst/include/CImg.h:35484:17: warning: unsequenced modification and access to '_n1x' [-Wunsequenced]
  ../inst/include/CImg.h:48273:18: warning: unsequenced modification and access to 'err' [-Wunsequenced]
  ../inst/include/CImg.h:48281:18: warning: unsequenced modification and access to 'err' [-Wunsequenced]
  ../inst/include/CImg.h:48291:22: warning: unsequenced modification and access to 'err' [-Wunsequenced]
  ../inst/include/CImg.h:48475:18: warning: unsequenced modification and access to 'err' [-Wunsequenced]
  ../inst/include/CImg.h:48483:18: warning: unsequenced modification and access to 'err' [-Wunsequenced]
  ../inst/include/CImg.h:48492:20: warning: unsequenced modification and access to 'err' [-Wunsequenced]
See ‘/Builds/CRAN-QA-Simon/packages/mavericks-x86_64/results/3.3/imager.Rcheck/00install.out’ for details.