Found the following significant warnings:
  phreeqcpp/PBasic.h:481:16: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:481:36: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:481:54: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:482:3: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:483:23: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:483:43: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:484:15: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:484:34: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:485:18: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:486:18: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:487:15: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:487:33: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:487:51: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:488:3: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:488:21: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:489:17: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:489:37: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:489:57: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:496:20: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:496:40: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:499:20: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:499:38: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:499:57: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:500:18: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:500:36: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:500:55: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:501:19: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:501:37: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:501:56: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:502:18: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:502:36: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:502:55: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:503:18: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:503:36: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:504:19: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:504:37: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:504:59: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:505:18: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:505:36: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:506:17: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:506:36: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:507:15: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:507:34: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:508:18: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:508:36: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:509:18: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:509:36: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/PBasic.h:510:17: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
  phreeqcpp/transport.cpp:3078:10: warning: explicitly assigning value of variable of type 'int' to itself [-Wself-assign]
See ‘/Volumes/SSD-Data/Builds/R-dev-web/QA/Simon/packages/el-capitan-x86_64/results/3.5/phreeqc.Rcheck/00install.out’ for details.