winnipeg manitoba former u.s. president jimmy carter receive hospital care thursday become dehydrate charity house-building project canada ok habitat humanity say carter 92 become unsteady construction site slump away work area chair accord eyewitness say work hour step home use drill several workers help sit late take away ambulance medical issue result dehydration carter center say statement work build project habitat humanity charitable organization promote affordable home ownership carter take st. boniface general hospital treatment accord carter center base atlanta president carter tell us ok take offsite observation habitat say statement note work hot sun encourage everyone stay hydrate keep build carter democrat serve white house january 1977 january 1981 receive nobel peace prize 2002 humanitarian work carter whose family history cancer disclose august 2015 diagnose melanoma form skin cancer spread brain elsewhere spot liver surgery december year carter tell church late brain scan show sign disease peanut farmer georgia live long term office president u.s. history work global issue become widely regard good former president president leave office profoundly unpopular canada carter volunteer project build 150 home habitat humanity honor country 150th birthday organization note carter request others involve effort continue work day carter wife rosalynn carter travel around world work habitat since 1984 accord organization hospital carter foundation say former president carter hospitalize dehydration canada